Talk:Gall–Peters projection/Archive 2
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POV issues in Controversy section
The 'controversy' section of this article, as discussed above, has some POV issues. It does not read like a neutral assessment of the debate, but rather a criticism of the Gall-Peters projection from someone opposed to it. I've edited it in an attempt to remove the non-neutral language; explanations of my removals are below:
- 'Crusaders' > 'Campaigns' - while perhaps accurate in this case, I don't think it's neutral to describe a political campaign as a 'crusade'.
- Removed '... for the simple fact that it lacked any remarkable properties. Peters's co-option of it did nothing to change that.' The fact that we discuss this map in such detail here suggests that it does have 'remarkable properties'; at least, some people thought it did, which is why there was such an effort to promote it in the 1970s. The amount of attention the projection has received makes it remarkable, if nothing else does. (Also, 'co-option' implies Peters 'borrowed' an existing projection rather than coming up with it himself.)
- 'eerily similar' > 'similar' - arguably an insertion of POV.
- 'any other of the long line of (perhaps) well-intentioned, zealous, but poorly informed predecessors' > 'any of his predecessors' - the inserted 'perhaps' here is a weak attempt to make this description more neutral. Not everyone who has proposed a new map projection in the past was 'zealous' and 'poorly informed' and it is POV to argue otherwise.
- Removed entirely: 'Indeed, most ironically, the only region lacking distortion happens to be along a latitude just south of Arno Peters's native Germany[1] (and the opposite latitude in the southern hemisphere), not anywhere in the technologically underdeveloped world.' 'Ironically' is one of the words editors are specifically advised to avoid in Wikipedia articles, because its application is almost always disputed. This particular observation adds nothing to the article, and reads like an attempt to mock Peters and his political agenda.
The rest is basically acceptable, and I'll leave it for now. If you disagree with any of these edits, please discuss them below rather than just reverting. Terraxos (talk) 05:19, 15 July 2008 (UTC)
- I disagree that the rest is basically acceptable. It still reads like an attack against Gall-Peters rather than a description of the controversy itself. I don't really contribute to Wikipedia at all and yet, reading this I felt compelled to make a comment here. It's pretty bad. 60.242.32.137 (talk) 07:44, 28 March 2013 (UTC)
- Well, it's objective that Peters didn't bother to consult with any professional geographers and cartographers before launching his publicity blitz -- and therefore reinvented an 1855 map projection without understanding that that's what he was doing, and held a completely untrue and blatantly factually false misimpression that professional geographers and cartographers supposedly loved Mercator. And it's fairly objective that Peters gave forth with a lot of grandiose bombastic pompous rhetoric about how his projection was the greatest thing since sliced bread, but very few of these claims (other than the projection being equal area) held up and/or were relevant to choosing which map projection to use. Peters seems to have had very good intentions in some respects, but his belief that no-one before him had ever thought as deeply as he did about the social implications of map projections, and his unwillingness to listen to people who knew a lot more than he did about certain technical issues, meant that he stirred up a lot of antagonism which hindered his stated goals. AnonMoos (talk) 16:14, 28 March 2013 (UTC)
- If presenting the facts as documented by the sources amounts to an attack, then there is no way to fix the article. We can deal with any specific problems someone wants to moot. Strebe (talk) 21:09, 28 March 2013 (UTC)
References
Proposed new section, on properties, advantages & disadvantages
Extended content
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Proposed Added Section, to go above the Controversy section, because objective properties, advantages & disadvantages are what matter. Some Properties, Advantages & Disadvantages of Gall-Peters: Advantages: Due to its rectangular shape, & its great NS height for a given width, Gall-Peters (GP) is a very large map for its width. (Width is typically the limiting-dimension for a wall-map.) Large map-area means more room for more detail, more labeling, &/or larger labeling. And it's obvious that EW expansion, at all latitudes, to the map's full equatorial width, combined with large NS expansion, must and does increase scale at every point in every direction. Large scale allows nearby points to be more easily resolved and distinguished. .Size & scale are particularly important for working maps, as opposed to decorative maps. In particular, classroom maps often or usually must be examined at a distance (from seat to wall) Thematic maps in atlases must often be small in width, due to the need to show so many such maps in an atlas. That width limitation makes it particularly important to maximize area & scale for a given map-width. Some Specifics: . Region where scale is nowhere less than equatorial scale: Between the latitudes 60 south & 60 north, from Antarctica to Oslo, Stokholm & Helsinki's approximate latitudes, on a GP map, there is no place where the scale in any direction is less than the scale along the equator. That's 87% of the Earth's surface That can't be said for other equal-area maps that are in use. GP's area for a given width is about 1.62 times that of Mollweide, Hammer, & Goode Homolosine. GP's area for a given width is 1.42 that Eckert IV. ...and likely similar for the similarly-shaped Eckert III, & Equal-Earth. ...with the greater average-scale that goes with that greater area. GP shares the other usefulness-advantages of cylindrical projections in general: With a position-&-properties ruler, it's easy to determine, on a cylindrical map, the following quantities: Latitude, Longitude, scale & magnification (for a conformal map), and EW-scale, NS-scale &their ratio (for an equal-area map such as GP). Cylindrical maps treat all longitudes equally. Simplicity: Cylindrical-Equal-Area (CEA), of which GP is an example, is the 2nd simplest equal-area map (The simplest is Sinusoidal, which isn't popular, due to its shape-distortion and low min-scale). Using a simple diagram showing the horizontal projection of a sphere's surface onto a cylinder around the sphere in contact with its equator, the construction of CEA is easily demonstrated, and the reason for its equal-area property is easily demonstrated and explained. Not so with other equal-area maps. The equal-area property of Mollweide & Eckert IV can be demonstrated without calculus, but nonetheless requires a relatively elaborate geometric & algebraic explanation. Equal-Earth's construction, and why it's equal-area, are far too elaborate to explain to people. Disadvantage: Poor shapes at low-latitude. ...resulting in not-so-attractive or realistic appearance, and maybe some usage-inconvence in tropical-regions of the map, due to NS scales being up to twice EW scales. GP isn't designed to win beauty-contests. It goes without saying that (as with anything else) the advantages are available if one accepts the disadvantage. All CEA maps have flattening in extreme north latitudes. With GP, at lat 60, the ratio of point-max scale to point-min-scale scale is 2. That amount, or more, of shape-distortion at lat 60 isn't unusual for equal-area maps . Comparison of GP's shape-merit with that of other CEA maps: The Behrmann CEA map has a standard parallel of lat 30 instead of lat 45. The equatorward half of the the Earth is compressed EW,and the poleward half is compressed NS. On Behrmann, at the equator, the NS scale is only 4/3 times the EW scale. On Behrmann, about 2/3 of the Earth is portrayed with that point-min/max scale of at least ¾...i.e. with shape no worse than at the Behrmann's equator. That 2/3 of the Earth's surface extends, approximately, in the north, up to Barcelona, Spain; and to Garrison, New York, Omaha Nebraska, & Mount Shasta in California. GP only achieves that ¾ point-min/max scale over 21% of the Earth's surface, from (in the Northern Hemisphere) the latitude of southernmost Tennessee, up to the latitude of Cambridge & Northampton in England, a bit north of London. GP's strength is area & scale, not shape. Of course Behrmann pays for that good tropical shape by increased high-lat shape-distortion. On Behrmann, at lat 60, the point-min/max scale is only 1/3, instead of GP's value of ½. Behrmann's region with point-min scale greater than equatorial-scale is only the same 2/3 of the Earth in which it has point-min/max-scale greater than ¾. ...compared to GP's 87% of the Earth having point-min-scale greater than GP's equatorial scale. As is well-known, CEA maps can't have good shapes at both high & low latitudes. Projections like GP, Balthasart or Tobler CEA, which have relatively good shape at non-polar high-lat, don't look as good at low-lat. So, then, why not just use them only at high-lat, where they bring improvement? e.g. It's at lat 41.41 that Behrmann starts having point-min/max scale less than ¾. So, stacked directly over a Behrmann map of the Earth, have a CEA map that has NS/EW scale = 4/3 at lat 41.41 ...and, with that map, map the region from lat 41.41 up to the north pole. Do the same in the Southern-Hemisphere. The result is a stack of 3 CEA maps, with point-min/max scale of at least ¾ over about 5/6 of the Earth's surface, from the tip of South-America up to Glasgow & Copenhagen. ...and with point-min-scale at least equal to equatorial-scale over about 90% of the Earth's surface, which extends from Antarctica up to about the middle of Iceland. That high-lat CEA map with NS/EW scale = 4/3 at lat 41.41 is nearly the same as Balthasart. Its standard parallel is at lat 49.49 It goes without saying that different maps are best for different purposes. Scale & area improvements like GP or the above-described "CEA-Stack" are for working-maps, such as classroom-maps & thematic-maps, for which precise or distantly-observed detail is likely to be needed. But of course if a map is mainly decorative, or if a realistic picture of the Earth is what is desired, and accurate measurement or examination everywhere isn't important, then a more globe-realistic map like Mollweide would be desirable. 97.82.109.213 22:29, 3 August 2021 (UTC)
There's nothing wrong with copying & borrowing from sources. But something is very wrong when it's claimed to be disallowed to discuss Gall-Peters' advantages (only its disadvantage can be discussed) if a peer-reviewed source can't be cited. Anyway, the important basic points in the proposed section consist of things much too obvious to require citation of a peer-reviewed source. Wikipedia states that its rules aren't set in stone, and that there can be exceptions. Surely there's such an exception when the "rule" would allow discussion of disadvantages, but disallow discussion of advantages. Properties-facts easily demonstrable by the known & usual principles of Cylindrical-Equal-Area maps aren't "Original-Research". Anyway, I do have a Notable-Source. But first I re-emphasize that my proposed section contains two kinds of statements about fact: 1. Facts that are much to obvious to need citation of a "reliable source". ...such as what I said about the obvious relation between map-expansion & scale-increase. If you expand the map, or any part of it in one direction, making no change in the direction perpendicular to it, then obviously that will increase scales in some places, in all directions other than the one perpendicular to the explansion And if you expand all of the map in both dimensions, that will increase scale at every point in all directions. That's way too obvious to require a Notable Source. ...as is the fact that place-name labeling is easier to read if the lettering is bigger, and lettering can be bigger if map-area is bigger. ...and that determination of the geographical position of zone-boundaries in thematic-maps is easier if the map is bigger and the scale larger. ...and the fact that classroom ,maps are often or usually observed from at least partway across the classroom, from someone's desk to the wall. 2. Facts, about numerical map-properties over particular latitude-bands, require some calculation. If I determine and report such facts, you call it "Original Research". For one thing, that's really a misuse of that term, because it implies that I've discovered and studied a new area of study, and found out things that no one has previously known. No, the numerical specifics that I reported are about matters familiar to cartographers. ...nothing new or previously unknown. And, anyway, as I said, I have a Reliable-Source. ...unless you want to say that Daniel Strebe is unreliable. Strebe has demonstrated his willingness and motivation to refute Arno Peters' false-claims. He's evidently motivated to refute false claims that are in favor of Gall-Peters. Therefore, if any of my numerical claims are false, Strebe will refute them. ...and, if he doesn't, that amounts to a statement from a Reliable-Source, that my numerical claims are correct. Daniel Strebe is my reliable source. We're indeed fortunate at this article, to have a reliable source at this article-page. -- 02:34, 4 August 2021 97.82.109.213
Strebe— [quote] We don't construct arguments [/quote] When responding to a request for a pros/cons section, one gives reasons pro & con. You can call that “constructing arguments”, but a pros/cons section is inevitably going to sound like “arguments”. Here’s a quote from Wikipedia: “Some sections do not have to be neutral. Examples include criticism sections and pro and con sections.” Neither the “advantages” nor the “disadvantages” part of the proposed section can be “neutral”, and both inevitably will sound like “arguments”. However, I stated both the advantages & disadvantages of GP…all the ones that I’m aware of. That’s neutrality. I didn’t ignore GP’s low-lat shape-problem, and the various kinds of resulting disadvantages. [quote] These Talk pages are not soap-boxes [/quote] I’ve been told that major changes to an article (such as a new section) should first be proposed at the talk-page, and that’s what I did. [quote] Wikipedia articles are not permitted to make claims, even "obvious" claims, without citing reliable sources. Strebe (talk) 07:59, 4 August 2021 (UTC) [/quote] Incorrect. You’re attempting an inappropriately legalistic use of WP policies, attempting to use them as rules that you can interpret to disallow mention of GP advantages. …to preserve the 1-sidedness of your article’s discussion. …about which a number of people here have commented. Wikipedia says that an editor who wants to contravene the letter of a policy (they aren’t “rules”) must give reasons to justify that. I’ve been doing so. 1`. My numerical statements are easily verifiable, given that we have an in-house resident cartographer at this article. 2. Legalistic adherence to the source-citation suggestion would mean that GP’s advantages would be disallowed in the article. …not good, for a pros & cons section. (See, below, the 1st sentence in Justin Kunimune’s reply.) Obviousness is an instance of what is meant by WP’s advice to use common-sense instead of legalist application of policies as hard-&-fast “rules”. I won’t quibble about whether or not you’re a “source”, even though, by the dictionary definition, you’re indeed a source or potential source of reliable information about maps. My point was that, given that we have an in-house resident cartographer at this article, that must affect the notion of “verifiability” here. As I said, you’ve demonstrated the inclination & motivation to refute false statements that favor Gall-Peters, and an inclination to take the time to debate, for many pages, the meaning of “Irony”, and the grammatical difference between “Peter”, “Peters”, “Peter’s” & “Peters’” Therefore, if the numerical facts in my section were false, you’d say so. You haven’t. Due to your presence at the article, any objective facts that I state about maps, including the numerical facts in my proposed section, are indeed verifiable. Justin Kuimune— [quote] Well, obvious claims can often be left uncited (as per WP:BLUE). personally, I'm less concerned with the list's factuality, and more with its length and subjectivity. [/quote] What??? A pros-&Cons section was requested, and I’ve listed, completely, the advantages & disadvantages that I’m aware of. …and you object that it’s too long? How about the long, long section on history & controversy? :D [quote] for a list of this scale, deciding what to include and what not to include will always be subjective, and will thus always run the risk of pushing a point of view. [/quote] I did my best to mention GP’s usefulness advantages, and the various kinds of disadvantages detrimental to beauty, realism & usefulness resulting from GP’s great low-lat shape-distortion. I emphasized GP’s low (21%) percentage of the Earth shown as shape-accurate as Behrmann’s equator (i.e. with point-min/max-scale of at least ¾). I was clear that one wouldn’t choose GP for its shapes, beauty or realism. And, yes, I spoke about GP’s often-important usefulness-advantages of large area & scale for a working-map. [quote] that's what I mean when I call it original research, not that you have "found out things that no one has previously known", but that you have come up with original ideas that no one has previously published. [/quote] Are you really going to claim that readability & practical usefulness of a big, vs a small, map, or big, vs small, map-scale, isn’t mentionable at WP unless there are publications about it? Could it be that some things are too obvious to devote journal-publications to? …but a pros-&-cons section for GP was requested, and I complied. I suggest that the relation of readability & usefulness to map-size & map-scale aren’t an “original idea” that I’ve “come up with”. …but rather just something too obvious to publish about in journals. [quote] I'm curious what you mean when you say that the rules "would allow discussion of disadvantages, but disallow discussion of advantages". It seems to me that the page already goes over a few of both, specifically as they are relevant to the surrounding controversy. are there specific disadvantages that you think are unfairly emphasized in the article as it is? Justin Kunimune (talk) 12:32, 4 August 2021 (UTC) [/quote] An excessively legalistic interpretation of a few WP policies (they aren’t “rules”) would disallow mention of unpublished, but grossly, blatantly, obvious GP advantages. And no, those advantages are NOT covered in the article, though GP’s shape-problem is well covered there. That’s a bias and an imbalance, and a reason why the article needs an objective advantages/disadvantages section, such as the one that I propose. AnonMoos-- If the format is too abbreviated, and the wording needs more filling-out, then I'll be glad to fill it out more. So let me know where. Of course, for clarity, it's necessary to find a balance between detail & redundancy, vs brevity. I've tried to be as brief as possible, while still saying enough. But, definitely, let me know where I've erred too far in the direction of brevity. I emphasize that I wasn't comparing GP to Mercator. I was comparing it to other maps that are advocated over GP. ...mostly equal-area maps (...though I mentioned Robinson & Eckert III too). And I told of ways in which GP is better than other maps. ...but I also mentioned its disadvantage, because the proposed section is about both advantages & disadvantages. I wrote at some length about how the large low-lat scale-ratio is a disadvantage for realism, beauty, and even maybe for practical-use. So GP is better than other maps in some way, and they're better than GP in other ways. And isn't that always how it is? That's why I clarified for what uses GP is better, and for what other circumstances other, more realistic &/or beautiful maps would be desirable. -- 04:37, 4 August 2021 97.82.109.213
Strebe-- [quote] [quote] When responding to a request for a pros/cons section, one gives reasons pro & con. You can call that “constructing arguments”, but a pros/cons section is inevitably going to sound like “arguments”. [/quote] That argument, and the rest of them, do not fly in the face of Wikipedia policies. [/quote] If you’re saying that they do fly in the face of Wikipedia policies, I remind you that policies aren’t rules. Wikipedia says that editors wanting to contravene a policy must tell justification…as I have done in my most recent posts here. I’ve told why this is an exceptional situation, for two reasons that I stated in a numbered-list, and I’ve told why exceptions to policy are justified. Wikipedia says that it’s common for editors to misrepresent Wikipedia policies as hard-&fast “rules”, with no exceptions permitted, and to try to unjustifiably use them to prevent content that they disagree with or don’t like. [quote] No, we do not construct arguments to include as material for the article text. …We do not create pro/con lists invented by ourselves. [/quote] I merely stated facts that are obvious to anyone, which is permitted by Wikipedia. [quote] An observation anyone could make is one thing, and is permitted [/quote] Good because that’s what I stated in my basic general non-numerical points. [quote] , but drawing conclusions about that observation is quite another thing, and it is not permitted. [/quote] I didn’t draw conclusions from the obvious observations. I merely stated them. If you want to claim that I drew conclusions in my basic non-numerical points, then a specification of instances would be required. [quote] Wikipedia’s guidelines about “common sense” do not include the kinds of WP:SYNTH and WP:OR that you are talking about. [/quote] I trust that you understand that a serious challenge would have to be a lot more specific than that. https://en.wikipedia.org/wiki/Wikipedia:You_don%27t_need_to_cite_that_the_sky_is_blue As I said, my general basic points state facts that are obvious to anyone, and don’t depend on constructing synthesis or drawing conclusions from them. And I repeat that my numerical statements in the proposed section are all verifiable…You, Strebe, could verify or refute them. …or are you less “Notable” than some newspaper reporter & editor who don’t know squat about their topic? You aren’t going to? Fine. Wikipedia’s verifiability policy doesn’t call for actual verification. Mere verifiability is sufficient.
[quote] The unsigned editor writes: I merely stated facts that are obvious to anyone, which is permitted by Wikipedia. They’re not obvious. Practically all of your claims are false, debatable, or else the significance is debatable. In other words, not obvious. [/quote] My main point was that a larger map is easier to use, to examine places, to judge or measure distances, to determine the geographical-position of a zone-boundary on a thematic map, to read the labeling, etc. False? Debatable original research? Debatable significance. You’re joking, right? That’s obvious common-knowledge. It’s why atlases with large page-area are printed & purchased, in spite of their relatively-higher price. A pocketbook-size atlas would be considerably less useful than one with the more typical large page-area. It’s why publishers print, and people buy, roughly 5’X3’ wall-maps instead of postcard-size wall-maps. How’s all that for original-research? Shall I name it after myself? :D [quote] If the points you are making were important enough to matter, you would find these points being made in citable literature. They’re not. [/quote] As I’ve already explained here, some things are too obvious to need or justify journal-articles. …and therefore are not “citable”. Is there a journal-article to cite that it’s unwise to lie down in the bottom of a space that’s being filled with concrete, or that you get more exercise by lifting 15 pounds than 2 ounces…so it can’t be said in a Wikipedia article? :D And you say or imply readability and usefulness are unimportant. :D That’s a bizarre claim to make. [quote] That means they do not meet Wikipedia’s threshold for inclusion. [/quote] It means that you’re playing fast-&-loose and creatively with Wikipedia’s policies. [quote] To illustrate with your first five points: • Due to its rectangular shape, & its great NS height for a given width, Gall-Peters (GP) is a very large map for its width. (Width is typically the limiting-dimension for a wall-map.) With “large” undefined here, I don’t know what that intends to mean. [/quote] Merriam-Webster: “Large: 4a Exceeding most other things of like kind, especially in size or quantity.” “Size: Physical extent, magnitude, or bulk..” The kind of “extent” referred to for maps is their area. Instead of making you look up “area”, I’ll just say that the area of a rectangle is determined by multiplying its length by its width (qv). …and that, for non-rectangular plane-regions, the areas of infinitesimal rectangles (or sometimes triangles) within a region are often summed to determine the area of a non-rectangular plane region. Area is expressed in linear units squared. e.g. square inches or square centimeters. [quote] You state, without evidence, that width is typically the limiting factor for a wall map. I disagree. [/quote] Well, look at a map on a wall. Above or below where it’s mounted, one wouldn’t place a map. We don’t place maps up adjacent to the ceiling, or down adjacent to or near the floor. Therefore maps and other wall-posted things don’t compete for vertical-space, and so their vertical dimension isn’t their fit-critical dimension (their dimension that determines whether they’ll fit in a particular space. And, additionally, for nearly all maps in equatorial-aspect mounted with equator horizontal, the width is considerably greater than the height. [quote] …and I also disagree that wall maps are necessarily what is important. [quote] They’re often important, as in classrooms. But atlases often have small thematic maps vertically stacked on a page. They adjoin eachother on edges that are (at least roughly) parallel to their equator, parallel to their X dimension. They don’t adjoin eachother along edges parallel to their Y-dimension. So their width is limited by the width of the page, and each map’s area depends on its space-efficiency (fraction of the map’s circumscribing-rectangle that the map fills) and the variable consisting of the map’s height (Y-dimension). If the book doesn’t need so many such maps as to tax the books page-capacity and make it too thick, then the area of the maps depends on their area for a given width. Often it’s convenient to calculate that quantity by dividing their space-efficiency by their aspect-ratio. If the number of those small thematics maps needed is so great that they threaten to make the atlas require too many pages, then space-efficiency itself could become the critical map-quantity that limits the feasible combined-area of the maps. …but, otherwise, the critical map-quantity is area for a given width. [quote] Large map-area means more room for more detail, more labeling, &/or larger labeling. Not so. [/quote] What a funny thing to say. Can you justify that strange claim? [quote] As an equal-area map, Gall–Peters has exactly as much area as any other equal-area map. [/quote] Yes, it maps the same planet, and therefore a planet with the same area. World-maps differ in area. A world-map could be printed the size of a postage-stamp, or could cover a wall of a large room. In equatorial-aspect, with the X-dimension as the width, and for a given width, a Gall-Peters (GP) map has more area than any other world-map that has been used to any significant degree. …much more area. …because of its maximal space-efficiency (unity), and its very low aspect-ratio. Or if you’re just looking at how much area a map has as a percentage of the area of its circumscribing-rectangle, then of course that’s what I call “space-efficiency”, and the cylindrical equal-area projections collectively beat nearly all of the other equal-area maps. (…other than the few rectangular non-cylindrical projections, whose construction is far too complicated to offer to the public). [quote] The massive left-right stretching in the mid- and higher latitudes is negated by increasing top-bottom compression toward the poles; likewise, the vertical stretching in the low latitudes is negated by the east-west compression. [/quote] Yes, an equal-area map doesn’t magnify some regions more than others. And, on an equal-area map, a point with greater X scale has proportionately less Y-scale. It’s intuitively obvious that there’s a cancellation of effects there, and a sense in which overall scale is unchanged. In fact, the geometric mean, over all the points on the map, and all directions at each point, is proportional to the square-root of the area of the map. (more detail below about that.) But it isn’t necessary to say that in the proposed section, because the cancellation between the expanded & shrunk scales at a point on an equal-area map is intuitively obvious. (The points considered don’t include the pole, because, for most equal-area maps, there’s an infinite scale there, and an infinite scale can’t be represented by a number.) Gall-Peters (GP) , with its maximal space-efficiency, and its low aspect-ratio, achieves a much greater area for a given width than other comparably-widely-used equal-area world-maps. [quote] • And it's obvious that EW expansion, at all latitudes, to the map's full equatorial width, combined with large NS expansion, must and does increase scale at every point in every direction. This is not only not obvious; I cannot even tell what you mean. Every map projection distorts scale. To claim “in every direction” is to claim something apparently false, since north-south compression on Gall–Peters increases infinitely at the poles such that the scale in the north-south direction at the pole is zero rather than 1. [/quote] All or most equal-area world-maps other than pointed-pole maps such as Collignon, Sinusoidal, Craster-Parabolic, and Quartic-Authalic, have infinite-scale and zero-scale at the poles. .e.g. Mollwide, Eckert IV, and Equal-Earth do. So, when I spoke of increasing the scales in every direction at all points, yes that’s untrue at the poles. For most equal-area maps, there remain zero scale and infinite scale at the poles. So yes, add “except at the poles” to what I said. 1. Double the linear dimensions of any map, while keeping its original proportions, and you quadruple its area. i.e. Its area is proportional to the square-root of its dimension, when the shape & proportions are unchanged. Likewise,it’s obvious that any linear distance on the map, anywhere, in any direction, on the map, will also increase in proportion to that uniform increase in the map’s dimensions…and in proportion to the square root of the map’s area. That’s for a map that changes only its linear measurements, uniformly, with no change in shape or proportions. 2. What about different equal-area cylindrical or pseudocylindrical maps with the same area? Say we start with some non-cylindrical pseudocylindrical world-map. Say, just for example, it’s a Sinusoidal map. …but it could be any non-cylindrical pseudocylindrical. Starting at the equator, divide the NE quadrant of the map into very many very thin east-west rectangular lat-bands parallel to the equator. Starting with the lat-band directly above the equator, expand it to the full width of the equator. Because we want to keep equal-area, that rectangular band must be shrunk in the Y-dimension by the same factor it’s expanded by. Then do the same with the next ultra-thin lat-band above (north of) the previous one. …and so on, for all the stacked ultra-thin lat-bands of the entire NE quadrant of the map. The result is a Cylindrical Equal-Area map having the same area as the initial pseudocylindrical map. What about the geometric mean of the scales. Because equal-area must be maintained, when a rectangle representing a particular part of the Earth on the map is expanded in one dimension, it must be shrunk in the mutually-perpendicular direction. It can be shown that, at any point, when the scale there is increased in one direction, and decreased by the same factor in the mutually-perpendicular direction, then, for any direction whose scale is increased, there’s another direction in which the scale is decreased by the same factor. …meaning that the geometric-mean of the scales in all the directions at that point is unchanged. …and that the geometric-mean of all the scales at all of the points in that rectangle is unhanged. …and that the geometric mean of all the rectangular ultra-thin lat-bands that I mentioned on that map is unchanged. …and that the area of the entire NE map-quadrant is unchanged. Each of the ultra-thin lat-bands was kept to constant area, and so the area of the whole map-quadrant hasn’t changed. So, constant area for an equal-area map means constant geometric-mean, over all the points on the map, and over all the directions at each point, of the scale. So GP’s much greater area for a given width means a much greater average (geometric-mean) scale for a given width. …just as bigger scale is intuitively obvious for a bigger map. And yes it’s intuitively obvious that making a map will make its average scale bigger. • [quote] • Large scale allows nearby points to be more easily resolved and distinguished. • [/quote] It [Gall-Peters] doesn’t have “large scale” by any meaning I know of. >p> GP has large mean scale. …referring to the geometric-mean, over all points on the map (except the poles), and over every direction at each point. That geometric mean is proportional to the square-root of an equal-area map’s area. For a given map-width, do you know of any other widely-used equal-area map with as high a geometric mean scale (averaged over all points on the map, and over all directions at each point)? GP also has point-min-scale at least equal to its scale along the equator, all the way from lat 60 south, up to lat 60 north. Can you name another widely-used equal-area map for which that can be said? [quote] Severe north-south compression in the high latitudes ensures that points oriented vertically are less easily resolved (than… what?). It’s intuitively obvious that a bigger map has bigger average-scale. And it can be demonstrated that the geometric-mean, over all points on the map (except the two poles), and over all directions at each point, is proportional to the square root of the map’s area (…as expressed in square-inches or square-centimeters). [quote] • Size & scale are particularly important for working maps, as opposed to decorative maps. It depends on what kind of work. [/quote]
How about the kind of work that requires the map to be readable and its labeling to be legible?
I made it quite clear that I was referring to map-use that involves precise measurement or examination, or distant-viewing (as from a desk to a wall-map in a classroom). [quote] , so this statement is also debatable and definitely wrong in some circumstances. [/quote] See above. I never said that one never uses a map other than at a great distance, and in a way that doesn’t require close measurement or examination. In fact, I said that for a primarily decorative map, or when one prefers realism to other considerations, a more globe-realistic map such as Mollweide would be desirable. [quote] There is nothing special about these five points; most of the others are similarly debatable. [/quote] All of your objections were answerable. [quote] 1The fact that these points are debatable and not cited… [/quote] They aren’t debatable, and are too obvious to require citation. …just as you’ll never find a citatable journal-article about the fact that “square” and “not-square” aren’t the same. So you wouldn’t let a Wikipedia article state that either? [quote] More to the point, if a pro/con list were something important enough to be included in the article, then such lists could be found in the literature. [/quote] You’ve got to be kidding. The pros & cons of anything intended for any important use, including a map-projection, are important. If you think it should be in “the literature”, then write it there. I don’t claim to know or care why someone does or doesn’t write something, or why someone dislikes something so much that he doesn’t think it merits a pros-&-cons discussion. It’s none of my business, and it’s irrelevant to the merits of GP. But shall I speculate? I’m not criticizing the people who write “the literature”, but just maybe they don’t like Gall-Peters, due to its unaesthetic and unrealistic low-lat shapes. Sure, I don’t like its low-lat shapes either. But some might feel that that’s a reason why GP doesn’t deserve a pros-&-cons listing, because, **in their own subjective-judgment**, it’s entirely unacceptable, &/or is merits-dominated by all other equal-area world-maps, due to its bad low-lat shapes. Maybe GP’s unpopularity among the other cartographers would deter a cartographer from mentioning that it has an advantage. One must think of one’s reputation. …merits-dominated by all other equal-area world-maps because GP (in some people’s perception) has no advantages to justify its use, given its bad low-late shapes & unrealism. And (just speculating) maybe GP’s unpopularity among the other cartographers would deter a cartographer from mentioning that it has an advantage. One must think of one’s reputation. And certainly the shenanigans of Arno Peters, his false-statements, his claim of priority for Gall-Orthographic, and for equal-area maps in general…maybe those decidedly un-academic-like acts has strongly prejudiced academia, to the extent that any academic would be embarrassed to speak of GP having an advantage, for fear of seeming to support the academically-unpopular Arno Peters. Look, your article about Gall-Orthographic REEKS of POV. Not only do you refuse to allow mention of Gall-Orthographic’s advantages, citing some inapplicable and invalid legalistic-claim that misinterprets Wikipedia policy…but you also fill the article about Gall-Orthographic with irrelevant prejudicial material about the antics of some who didn’t introduce it :D Talk about bias, and POV! Most articles about a map-projection are only about the projection. You fill your article with (as I said) voluminous irrelevant and prejudicial material about Arno Peters—who wasn’t even the introducer of the map. Alright, I’ll claim that I invented the Mollweide Projection. Now you have to fill the Wikipedia article with information about my false claim that I invented Mollweide, and whatever false claims I choose to make about it. …Oh, what’s that? You say that the only reason you won’t do that is because I don’t have Arno Peters’ publicity connections, savvy, & ready-opportunity? The Gall-Peters article needs thorough overhaul. Add pros & cons, and move all the Peters history, & controversy to the Arno-Peters page. He’s famous enough to rate a Wikipedia page about him, but not enough to dominate the article about Gall-Orthographic, which he didn’t introduce. All that derogatory scandal-history with which you’ve stuffed the article about Gall-Orthographic is intended to discredit James Gall’s Orthographic projection by tying Arno Peters to it. Your article intentionally confuses academic reaction to Peters’ false claims, with the merits of the map itself. Well guess what: GP does have advantages, and I’ve named some of them. And they’re blatantly, grossly obvious. I’ve described them in general, and I’ve specified them quantitatively.
Justin-- Thanks for the reply. I guess it’s a matter of individual preference. For me, subjectively, for some applications, a little practical-advantage outweighs a lot of unrealism & ugliness. But of course to each their own. I’m delighted by GP’s amount of use. And, anyway, again it’s just a matter of personal opinion, but I feel that Wikipedia is way too cautious about crackpots. I feel that content should be judged on its own merits, and that the matter of whom it’s from is relatively irrelevant. I’d like to mention an extreme case as an example. As you know, there have been numerous authors who advocate very questionable archaeological theories. One of them, among the other things he said, suggested that the Vernal-Equinox was in Leo in 10,000 BC or 10,500 BC (I don’t remember which). An astronomer (a notable person) said that it wasn’t in Leo in that year. He justified his claim by saying that Planetarium software said so. But the R.A. & declination co-ordinates that he gave for the Vernal-Equinox’s position in that year was exactly, right to the arc-second (or whatever precision it was given in), the position that it would have had if precession had had its *current* rate all the way back to 10,000 BC. But it didn’t. By a graph of precessional rates over that duration, from a very esteemed & notable expert source (maybe Laskar), and based on the proper-motion of the stars in Leo, I determined that, in the year in question, the Vernal-Equinox was indeed in Leo. It was inside the triangle that forms Leo’s rump, at the rear (east) end of Leo. The astronomy professor had, erroneously or intentionally, given an incorrect position based on planetarium software that was using an obviously wrong precessional-rate. That astronomy prof, a notable-source, was talking pseudoscience bull-____. But Wikipedia insisted on taking his word for it, and not allowing any mention of the obvious questionableness of a Vernal-Equinox position that precisely matches the position given by assuming that today’s precessional-rate has always obtained. It was impermissible to mention that. I pointed out, to whoever was answering communications, that they needn’t take my word for it. All that’s necessary would be to look at the position given for the Vernal-Equinox by planetarium-software that assumed constant precessional-rate at the current-value. But no. Evidence doesn’t count. Whatever a “notable” person says is sacrosanct and not to be questioned, even by looking at obvious readily-available evidence. I don’t believe the archaeology-charlatan’s theories, but I didn’t like it that easily demonstrable pseudoscience from a “Notable” person trumps readily-available evidence that anyone can check, regarding the astronomy prof’s claim about where the Vernal-Equinox position in 10,000 or 10,500 BC. ...that a notable astronomer could say pure obvious pseudoscience, and no one was allowed to mention the, available-to-all, evidence that makes his statement more than a little questionable. Sure, he wanted to debunk a charlatan, but it shouldn’t be done with the use of falsity & pseudoscience. I mention that episode because it shows that a notable source isn’t really always a reliable source.
Justin— Well, I fear that Wikipedia isn’t going to allow the experiment that would resolve that wager. About wall-maps’ fit-critical dimension: Let me re-emphasize this: Look at a wall-map, at the space above & below it. Would you want to put a map there? No one wants a wall-map, or any other wall-posted thing, to be up adjacent to the ceiling, or down near the floor. Therefore that space isn’t used, and is available for the map’s vertical-dimension. There’s room to have the map’s vertical dimension as large as you want. Gall-Peters? Sure. Square Tobler CEA? Sure. I admit that there could be some book-page situations where a map’s X-dimension might not be its fit-critical dimension. But, as I mentioned in a previous post, for those little thematic maps, several to a page, that some atlases have, it can be convincingly argued that their fit-critical dimension is their X-dimension, unless there need to be so many pages of them that they threaten to make the atlas too thick. …in which case pure space-efficiency might become more relevant. Another thing: For both Sinusoidal and Lambert CEA, the average (geometric-mean) scale over the whole map (except at the points at the poles), in every direction, is exactly equal to the scale along the equator. …suggesting that there’s something significant & special about the equatorial-scale, the scale along the equator. I refer to the geometric-mean of scale over the map, in every direction, referenced to, expressed in terms of, the scale along the equator, as “av-scale”. So Sinusoidal & Lambert CEA have av-scale of unity. Most equal-area projections have av-scale greater than unity. An exception is Collignon, which has av-scale of only .89 Here are the av-scale values for some equal-area projections: Sinusoidal: 1 Lambert CEA: 1 Behrmann: 1.155 Mollweide: 1.111 Eckert IV: 1.184 Gall-Peters: 1.414 -- Above comment by User:97.82.109.213 @97.82.109.213:, I think you need to review some basic Wikipedia policies and guidelines:
A more minor, but still important WP standard: I certainly agree with you that the article needs to talk about both the advantages and the disadvantages of Gall-Peters, and I look forward to your contributions in that direction... but you need to follow Wikipedia's policies and guidelines to move that forward. Thanks, --Macrakis (talk) 20:16, 10 August 2021 (UTC) Makrakis— • [quote] • No original research -- Wikipedia doesn't publish its editors' own analyses, but only reports on what reliable sources say about a topic. I • [/quote] We’ve been over that. In my proposed section, I didn’t include “Original-Research”. I merely stated facts that are obvious to anyone, and to which the “Original-Research” & “Verifiability” exclusions don’t apply. …and quantitative statements that are easily verifiable, because they could be easily verified or refuted by Strebe, an in-house resident cartographer at this article. And, as I've mentioned, Wikipedia policy doesn't emphasize verification itself, but rather mere verifiability--the availability of accuracy determination, should it be desired. You’re applying Wikipedia policy in a manner different from what Wikipedia's written guidelines and policy-explanations say. • [quote] • t shouldn't be hard to find some reputable source that covers the issues you mention above. • [/quote] As Strebe pointed out, most cartographers aren’t interested, probably because there seems to be a rule that the only relevant standards for comparison of equal-area projections consist of various ways of expressing difference the maps’ point-max-angular-error (its global-average, zonal values, global-max, etc.). ...and because, as Justin Kunimune suggested, most cartographers’ subjective feeling is that the usefulness-differences are too small to matter. I’ll just add here that, from what I’ve read, Walter Behrmann said that Behrmann CEA has less average point-max-angular-error than any other equal-area world map-projection. • • [quote] • Collaboration with other editors is the way to get things done. • [/quote] I didn’t say or imply otherwise. Of course I value suggestions and additions, and there’s no reason to suggest otherwise. [quote] Talk pages are for productive discussion about the article, not for treatises on the subject-matter of the article. [/quote] My post today was discussion about the merit and justification of things that I said in my proposed section. …i.e. things relevant to the article itself. It was a reply on the matter of whether map-width &/or equatorial-scale is a good reference-quantity. …and support for things that I said in my proposed section. • • [quote] • Concision is valued--don't write long, repetitive posts on Talk. • [/quote] TV has conditioned many people to want soundbites, but some topics aren’t well addressed in that way. But, if something can be said briefly, then of course that's how I want to say it. • • [quote] • I would add: format your contributions so that they're more structured and thus easier to read. • [/quote] I didn’t ignore structure, and I tried for clarity. But I always welcome comments & suggestions that would improve clarity and brevity. A problem with brevity is that it can reduce clarity. A balance must be sought between brevity & sufficiency of explanation & expression. As I said, I welcome suggestions & comments.
Strebe-- ″it must be verifiable before you can add it." Of course. My numerical-statements in my proposed section could be verified (or refuted) by you. ...could be verified. That's what matters. You could choose to say whether they're correct or incorrect. ...or not, as you choose. But the relevant fact is that you could. ...and if you said that they're correct, then there wouldn't be any concern that readers would be misled by false statements in the article. ...and if you don't say, it remains that the statements are verifiable, meaning that they could be verified if desired. -- Above comment by User:97.82.109.213
Will do! I assume that the colon must be added to the beginning of each line. It would be a convenient way to copy when replying in Word, without having to do the copying-procedure at the Wikipedia editing-space.
I’m not sure whether you’re referring to my proposed section, or to my replies at this talk-page. If you’re referring to the proposed section: Though maybe, sometimes, one repetition is alright and can be helpful if it’s unobtrusive, and called-for for a reason such as a seeming-contradiction, I agree that it’s undesirable to repeat something so as to put readers off. I said that I was interested in suggestions, and so there’s no need for your hostile tone, and implied claim of uncooperativeness that accompanies your suggestion. If you’re referring to the talk-page: I won’t deny that, when answering the same objection, I give the same answer.
]Verifiability is about verification being possible. Look it up. Yes, ordinarily the only readily-available verifiability is via citation of a notable (most definitely not necessarily reliable) publication. But Wikipedia’s written guidelines recognizes & emphasize that circumstances aren’t always usual, and, when they aren’t, the guidelines aren’t hard-&-fast rules. I mentioned that before, but evidently it didn’t sink-in. Wikipedia’s policy guidelines aren’t meant to be made-into, and used as, graven-in-stone, dogmatic, literalist, fundamentalist, quasi-religious doctrine. Wikipedia’s written guidelines have been quite explicit about that, as you well know. At the risk of being criticized for repetition evidently it’s necessary to repeat this: Wikipedia says that an editor who wants to do differently from what a guideline suggests, must give justification for that contravention. I have done so. …or did you miss that? Anyone who didn’t know you better might get the impression that you just want to keep favorable information about Gall-Peters out of the article. Wikipedia, in various of its articles, points out that there are lots of editors who try to use an incorrect literalist misinterpretation and mis-stating of the guidelines, for the purpose of trying to exclude content which they don’t like, or with which they disagree. They say that that is quite common at Wikipedia. When I visited this article in recent weeks, I read old talk from years ago, and I replied, at this talk-page, to someone who had, long ago, requested a pros/cons section. I said it’s astounding that this article about an unprecedentedly popular projection still has no pros/cons section. I said, “Have we been overzealously editing?”, because it was obvious that something very wrong has been going on, for there to still be no pros/cons section. Want to know why there isn’t one? Look at the most recent talk-page posts. Evidently this article currently has a set of editors who don’t want a pros/cons section, who don’t want the article to say anything favorable about GP. Evidently the editors who felt otherwise (I’d been reading old talk-page from some years ago) have by now given up & left in disgust. That means that the only I way can enforce a balanced article with a genuine pros/cons section will be by appeal to Wikipedia administration. That will probably be a long procedure, and one that I don’t really want to initiate at this time.
Ok, I’ll come up with a good pseudonym, and start signing with it in the officially-recommended manner …maybe “Arno”. BTW, I emphasizes that much of what I’ve lately posted has been in reply to people who objected to my statement that typically, and especially for wall-maps, a map’s X-dimension is its fit-critical dimension. Admittedly sometimes there could be circumstances, such as some bookpage-fits, that could make the Y-dimension fit-critical. Maybe, especially for some bookpage applications of single maps on some book-pages, it often isn’t known which dimension will be fit-critical, or maybe sometimes neither one is. For those instances, then, such things as point-min-scale and av-scale, instead of referencing the width or the equatorial-scale, would have to instead reference the height or the average scale along the central-meridian, or the average scale across the map’s largest Y-extent--or just the area (or its square-root) of the map’s circumscribing-rectangle. My discussion of av-scale, and my list of av-scale values for various equal-area projections, referenced the equatorial-scale, assuming that the map’s X-dimension is fit-critical. I didn’t do the calculations for the other circumstances, for reasons of brevity. But I told of a reason why the equatorial-scale seems special: The fact that the geometric-mean- scale on Sinusoidal and Lambert CEA is exactly equal to the scale along the equator. But, obviously, for those other circumstances, when the map’s Y-dimension or the area of the circumscribing-rectangle is a more appropriate reference-quantity, then one would use it instead. I emphasizes that this isn’t a “treatise”. I’m just replying to the objections expressed by Strebe & by Justin Kumemuni, about my assumption that a map’s X-dimension is its fit-critical dimension. -- Above comment by User:97.82.109.213
This post replies to Strebe & to Justin Kunimune: Strebe: In this post I’d like to, 1st, reply better and more clearly to some things that you said about scale; …and 2nd, to ask you a question. The question is below in this post. You said:
Incorrect. I told why it’s so. I don’t have time to repeat it, and to save space, I won’t.
Our subjective opinions about what’s important have no place at Wikipedia. But obviously sometimes atlas thematic maps, and sometimes wall-maps, are important. Obviously GP’s scale-advantgage only exists when width is the fit-critical dimension. Sometimes that condition doesn’t obstain. Therefore sometimes GP doesn’t have that advantage. Likewise, sometimes GP’s enormous scale-advantage, even when it obtains, isn’t needed. Sometimes larger scale can be useful, sometimes unnecessary. In summary, sometimes GP’s scale-advantage exists & is useful, and sometimes not. Hello? It’s well-understood by cartographers that different maps are useful in different applications. GP is no exception. It’s one thing to say that GP, like other maps, is only sometimes advantageous. It’s quite another thing to claim that it doesn’t sometimes have a significant advantage that’s sometimes important. … as do map-projections in general. • :”Large map-area means more room for more detail, more labeling, &/or larger :labeling.”
No, I explicitly referred to area for a given width.
Irrelevant. When you everywhere expand a CEA map north-south, you increase, at every point, the scale in every direction other than east-west. And yes, that’s equally true in the regions with skinny Tissot-ellipses. In fact, that’s where the scale-increase is needed the most. And I remind you that I explicitly exclude the poles from the points that I’m referring to, because, with most world-maps, at the poles there’s an infinite scale, to which a numerical-value can’t be assigned. • :”And it's obvious that EW expansion, at all latitudes, to the map's full equatorial :width, combined with large NS expansion, must and does increase scale at every :point in every direction.”
Wrong. I explicitly exclude the poles from the points to which I refer. Equal-area maps have points with low point-min-scale. But a general expansion of the map in the direction of that min-scale will increase it. …and also increase scale in every direction other than the direction perpendicular to the direction of the expansion. • Large scale allows nearby points to be more easily resolved and distinguished.
The geometic-mean, over all of a map’s points, and over all directions at each point, is proportional to the map’s area. A larger map has larger geometric-mean scale. …and general overall expansion of an entire map in a particular dimension increases scale, at every point on the map, in every direction other than the direction perpendicular to the expansion. That’s why, with GP, for all points between lat 60 south and lat 60 north, there is no point at which there’s a direction in which the scale is less than the scale along the equator.
…and a general north-south expansion of the map will increase those compressed scales. That’s a good reason for expanding a CEA map north-south. …a practice that began at least as early as 1870. (Smythe CEA lowered the aspect-ratio to 2, and thereby increased scale, at every non-pole point on the map, in every direction (other than east-west), referenced to the scale along the equator. And, as I said referring to the fact that expanding a map increases scales on a map. …and, in particular, the fact that a general expansion of a map in a particular dimension increases the scale at every (non-pole )point on the map, in every direction other than the direction perpendicular to the expansion….Those facts are so blatantly-obvious that, by Wikipedia’s rules they do not need citation of a notable or “reliable” source. As I said, Strebe, this article is very fortunate to have an in-house resident cartographer. …so that editors can ask you about the validity of statements about maps, and, in particular, about the map that is the subject of the article. Surely you’d agree that it’s good that you’re here to answer such questions. And so I’m going to ask you two brief, simple & straightforward Yes/No questions. Like all Yes/No questions, each of these two questions has four possible answers: 1. Yes 2. No 3. I don’t know. 4. I know, but I refuse to say. Question #1: Is the following statement true? With Gall-Peters, between lat 60 south & lat 60 north, there is no point at which there is a direction in which the scale at that point is less than the scale along the equator. Question #2: If the answer to the above question is “Yes”, can you name another equal area map projection that has been published, sold, and used by purchasers, and for which the above statement can be correctly said? That’s two Yes/No questions, each of which has the four above-listed possible answers. I thank you in advance for helping to inform the editors at this article. --------------------------------------------------------------- Justin Kumimune— I’d like to reply better and more clearly to a few things that you said: You said:
Our personal feelings and opinions have no place at a Wikipedia article. Either a map has some particular advantage under some circumstances, or it doesn’t. Either that advantage can be useful, or not. Period.
I make no such claim. GP has a enormous scale-advantages when width is the fit-critical dimension. Those advantages don’t exist if width isn’t the fit-critical dimension. Sometimes it isn’t. We needn’t quibble about how often it isn’t. And, even when width is the fit-critical dimension, and so GP has its enormous scale advantages, scale might nor might not be important, depending on the application. Is the map only intended for decoration of the wall? Is globe-realism the more important consideration? Maybe one isn’t going to do the precise or distantly-viewed examinations in which scale matters. In summary, sometimes GP doesn’t have its scale advantages, and sometimes they don’t matter, even if it does have them. Yes, cartographers have long been familiar with the fact that no map is the best choice for every application, every situation. Different projections are useful in different applications. As I said, we needn’t quibble about how often GP has its advantage, or how often that advantage is needed. It sometimes has that advantage, and it’s sometimes useful.
You’re saying that we don’t place maps with their sides adjacent to the extreme ends of a wall? Of course not, for a number of reasons. For one thing, a map that large would be expensive to purchase, and awkward to transport home after purchase, and costly for businesses to ship & store. For another thing, often there are other things (shelves, posters, portraits, etc.) that one wants to put on a wall. …sometimes including windows. But, as I said, another thing we don’t do is place a map adjacent to the ceiling or near the floor, and so, since maps & other posted-things aren’t vertically-stacked, there’s no limit on their vertical-extent, and the fit-critical dimension is width. Anyway, as I said, I don’t claim that width is always fit-critical, or that GP always has its scale-advantage, or that that advantage is always needed. …as is the case with other maps and their advantages.
Lots of posters are oriented vertically too. I don’t know that horizontally-oriented posters are more frequent. But you won’t find wall-maps up by the ceiling or down by the floor. If they must be fitted with eachother, it’s horizontally.
It isn’t just a matter of space-efficiency. Aspect-ratio, too, affects av-acale referenced to the scale along the equator (…which I don’t claim is always important). That’s why, with GP, from lat 60 south to lat 60 north, there’s no point at which there’s any direction in which the scale is less than the scale along the equator. …and it’s why av-scale (geometric-mean scale, referenced to the scale along the equator), though varying only slightly among most equal-area maps, and remaining very close to unity for nearly all equal-area maps, is enormously larger for GP. …about 1.4 times its value for most other equal-area projections. And I’ve told why it’s blatantly obvious to anyone that GP’s greatly multiplied tallnesss will greatly increase scales on the map. …scale at every point on the map, in every direction other than east-west. That’s far, far too obvious to need “citation of a notable or reliable source”. As I said, GP’s scale advantages are enormous when they obtain (and they sometimes do). And they’re sometimes useful. …which is as much as can be said for other maps & their advantages. :I think that's too small to mention. See above.
See above. And remember that personal opinions have no place at Wikipedia.
Anyone’s personal subjective views have no place at Wikipedia. …and that includes unsupported opinions about the views of notable authors.
First, of course it can’t be denied that GP has a significant disadvantage: It looks awful. …unrealistic & ugly, an affront to aesthetics. We all know how Robinson described it. It looks as if Africa & South-America were made of wax, and someone forgot to turn on the air-conditioner. As an admirer of the Mercator’s accurate local portrayal and mapping of each place, I have to say that GP doesn’t portray a good picture of tropical places. ….so FUBAR as to maybe sometimes be inconvenient to use. Yes inconvenient, but usable, as a practical-matter, for a working-map …and, if unappealing & even maybe sometimes inconvenient, that’s a trade for the potentially bigger scale that will sometimes make the map usable at all, making usability at an otherwise unusable distance. Yes, its main advantage, scale, sometimes exists & sometimes doesn’t. ] The disagreement is as you described: The advantage sometimes exists, vs the advantage usually doesn’t exist. To me, the latter sounds like something that would best be said only if the advantage can be shown to be vanishingly unlikely. …otherwise it’s just a matter of wording-choice or individual subjective impression. Because one doesn’t want a map up by the ceiling or down by the floor, then there isn’t vertical room to vertically-stack wall-maps, and so, if they’re fitted together, it’s horizontally…making width the usual fit-critical dimension for wall-maps. Schoolroom maps are usually wall-maps. That’s surely what the Boston school-system’s decision was about. That wall-map is typically viewed at a distance, at least partly across the room, from students’ desks. Sometimes short distances matter a lot, when it’s a matter of where a point is with respect to a national-border or a thematic-map’s isopleth or zone-boundary. For such precise determinations, at an across-the-room distance, scale can matter a lot. Therefore I claim that GP’s scale advantage usually exists and matters for classroom wall-maps. About GP, maybe school-kids who like scary-movies would like it, and might call it “That Wax-Museum Map”. Another thing: It’s likely that the deformation of Africa & South-America was what provided visual psychological confirmation to people that something different was being done, that Africa was indeed shown big. The deformation dramatized & proved the bigness! Maybe that’s why (it seems to me) Peters once said that the other maps called “equal-area” aren’t really. Maybe he, and many others, thought that nothing is changed unless it’s visible as that great 1-dimensional distance-multiplication. So maybe the deformation is why equal-area maps are in use by lots of socially-conscious organizations and by British & Massachusetts schools. I listed a number of other advantages that GP has in common with other cylindrical projections. They’re arguably obvious. Cylindrical projections’ equal portrayal of all longitudes is a well-known advantage. Surely it’s better if a school-map doesn’t disfavor some longitues. I suggest that, given the choices of for-sale maps available to it, the Boston school system made a good choice, arguably the best choice. Would I use GP? No, I’d use CEA-Stack instead. …and Behrmann where CEA-Stack’s great scale & high-lat shape advantages aren’t needed, or where CEA-Stack wouldn’t fit vertically. This is just a quick preliminary-note. To be continued…
BTW, to give credit where due, GP could easily be mistaken for the work of Salvador Dali, which surely counts favorably. So I take back what I said about GP being “…ugly, an affront to aesthetics”. How come it’s ugly when James Gall does it, but when Salvador Dali does it it’s worth a million dollars? But I don’t retract “unrealistic”. It’s an undeniable gross misportrayal. …justified for highschool geography classes, when precise distantly-viewed observation, estimate or examination of exact relative positions makes good scale paramount and, to that end, justifies bad shape-portrayal. …but not for elementary-school classes intended to give students a good idea of what the Earth looks like. For that purpose, Behrmann & Mollweide would be much preferable. I agree that it doesn’t have to be just one projection. …Mollweide for its globe-realism (interrupted on only one meridian, or on two meridians and shown as two realistic circular views of the Earth). …and Behrmann for its equal portrayal of all longitudes. In elementary-schools, Apianus II & Plate-Carree could be introduced, to establish the realistic circular Earth-view, the horizontally-doubled circle to show all, both sides, of the Earth; and the natural rectangular grid of cylindrical maps…and the grid-plan intention. …and then it could be explained that, to show all places in correct area-proportion, those two projections’ parallels can be adjusted, resulting in Mollweide & Behrmann, which would be on the wall. At a somewhat later grade, the geometric explanation for Behrmann could be graphically-explained, and even that of Mollweide could (maybe a bit later) be explained too. But it should be emphasized to the listener that it isn’t necessary to follow (& be able to repeat) that geometric derivation. Merely seeing it done, observing the rough gist of it, shows that there is such an explanation, & that the person would be able to understand if they studied it. It’s enough that each part of the explanation is plausible. I claim that maps’ construction & properties should be explainable in that way, to anyone & everyone. That’s one of the things that I like about CEA. …and it’s why I claim that Equal-Earth is inadequate. Sinusoidal? It’s the simplest constructed & explained, but it’s also a terrible portrayal of shapes over much of the Earth, not useful either for distantly-viewed precise relative- position observation, or for elementary-school portrayal of how the Earth looks. But, after introduction of Apianus II & Plate Caree, followed by an explanation of their inexact area-proportions, why not show the obvious natural way to achieve right-area-proportions. …by drawing the parallels with their globe-true length, and their globe-true spacing?...and then point out that the same accurate area-proportion can also be be achieved by adjusting the parallels-spacing of Apianus II & Plate Caree. …which gives better general shapes & better overall size & scale. Maybe some kids wouldn’t care, but, for those who did, their questions about what is done and why would be answered. But just to clarify something: I'd substitute CEA-Stack for GP, for all the applications that I said that GP is good for...and for Many others too*, because CEA-Stack shows much better shapes at all latitudes, compared to GP.
very good scale & shape are desirable. Yet another wall of text. Please remember that "Talk pages are for discussing the article, not for general conversation about the article's subject (much less other subjects). Keep discussions focused on how to improve the article." WP:TALK#USE These long contributions aren't helping. --Macrakis (talk) 21:49, 15 August 2021 (UTC) Most of what I said was directly relevant to the things I suggest saying in the article, and the objections to those things. The criticisms of GP, of varying merit, are certainly relevant, because those are issues about what can be said in the article. And, in an article about GP, when editors are cl aiming that GP is meritless compared to the other equal-area maps, and where I'm defending the merit of GP at this talk-page, it's reasonable for me to admit that yes, GP is completely merit-dominated(by CEA-Stack) . If GP genuinely isn't really the best for any application (because it's completely merit-dominated by CEA-Stack), then it shouldn't be taboo to say so...at the talk-page, and yes, even in the article. In response to
It doesn't need to be shown to be vanishingly unlikely. Standard practice is to only include facts if they are present in the RSs – that's WP:VERIFIABILITY (just so we're all on the same page: "verifiability" in the context of Wikipedia means that a fact can be found in a RS. Editors like Strebe are not themselves RSs, so having him confirm something does not make it WP:VERIFIABLE). Encyclopedic sources like Flattening the Earth and An Album of Map Projections don't mention things like aspect ratio or av-scale, so these facts aren't WP:VERIFIABLE even if they are verifiable in the colloquial sense. In addition, facts are usually only included if they are relevant to the subject's notability. The cartographers who use GP and the activists who write about it today only cite its cylindrical and equal-area properties, so the other pros listed above are not relevant to its notablity. As you have pointed out, such guidelines can be suspended in exceptional cases, but I don't see that there is sufficient reason to do so here, given how long the article will become if we include all pros that are sometimes relevant. In response to the specific point about the aspect ratio and width: You can see from this picture of a poster in a Boston classroom that there is ample space both on the sides and on the top and bottom. If they wanted to get a different equal-area projection with a larger aspect ratio, they could easily get one with the same scale and still have horizontal space to spare. They would have to move "oceans", "Peters Projection", "equator", and "hemisphere" to above or below the map, but "landforms" and "scale" are already there, so that shouldn't impact the display's readability. Based on how people use and talk about world map posters, it seems to me that the determining dimension of a poster is not its width but its total area, as that determines how much space it takes up visually and, as you noted, how expensive and awkward to transport it is. Justin Kunimune (talk) 03:11, 20 August 2021 (UTC) Justin— As I said, often an advantage of a map only obtains under certain conditions and applications. That’s as true of GP as it is of maps in general. No map is best for all applications. You can’t use a WP policy as a reason to say that there can’t or shouldn’t be an exception to that policy…unless you can show that that exception would be detrimental to the article and its informing of readers. I’ve told why an exception to the policy is needed, and would improve the article. …the exception of allowing a pros/cons section even though GP’s advantages & disadvantages don’t have notable citations. A complete pros/cons section is nonetheless needed. The articles’ readers would be informed much better, and the article would indeed be (much) improved. Additionally, WP explains that verifiability (by its usual meaning in English) is the reason why notable citations are ordinarily required. But this isn’t an ordinary circumstance, due to the presence, at this article, of a cartographer who is considered, by the other cartographers, to be reliable. It’s obviously a matter of legalistic-ness vs common-sense. If the numerical facts in my proposed section could easily be verified or refuted, by that agreed-reliable cartographer, then it’s verifiable, in any meaningful sense of that word. So, by common sense, if the information would improve the article’s informing of readers, and is verifiable, then how would you claim that it would be detrimental to the article? Yes, a listing of the GP advantages & disadvantages I stated—having a genuine pros/cons section--would inevitably lengthen the article…by one section. …a necessary section. If you’re concerned about article-length, then delete the long, unnecessary & irrelevant material about scandal-history. As I said, it’s common and typical for maps’ advantages to only obtain in some circumstances & applications. If, as is indeed sometimes the case, a world map on a wall doesn’t have to compete at all for wall-space, then, yes, space-efficiency would replace width as the limiting quantity. …as you said, because the mapsheet-area affects expense. …and because a map extending to floor & ceiling would have visibility problems near the floor, and be seen at an unhelpful angle near the ceiling, for close-seated students. …and the left & or right ends of a whole-wall-covering map might be seen at an unhelpful angle for some close-seated students. Those are drawbacks for a whole-wall-covering map. When there’s no space-competition, obviously Behrmann would be, scalewise, as good as GP…and has better shape over more of the Earth. Likewise, to a somewhat lesser degree, for Eckert IV & Equal-Earth. …and for Mollweide, to a slightly lesser extent. (…but Equal-Earth still suffers from a big uniquely-difficult-explanation disadvantage.)D Disadvantage of GP: What is GP’s problem? It’s obvious at a glance. As a greatly NS-Expanded CEA map, GP obviously gives good European shapes—Its standard-parallel is at lat 45. Equally obviously (even moreso, actually), as a greatly NS-Expanded CEA map, GP has drastically-unrealistic shape in the tropics. Those statements don’t require Original-Research, or citation of a Notable journal. :D So, without any Original-Reaserch, it’s plain that a greatly NS-expanded CEA map is great for higher latitudes, and no good for low latitudes. No Original Research there. Given the above, then where would it be good to use a greatly NS-Expanded CEA map? Let me guess: …at high lat, and not at low-lat? That, too, doesn’t require Original-Research, or a citation of a peer-reviewed journal :D But that’s just a description of CEA-Stack’s high-lat map-sections. CEA-Stack automatically, inevitably, comes up when GP’s problem is mentioned…as described above. …and therefore isn’t off-topic in a GP pros/cons section -- unsigned comment by User:97.82.109.213 at 2021-08-26T14:01:37
It would be more productive if, instead of adding more text to the Talk page, you added one important and well-documented advantage to the page itself, with sources. You seem to consider its aspect ratio to be an advantage. Fine. Add something like this:
or even
Now, I suspect that you won't be able to find reliable sources like this, which means that the claim is based on your own reasoning, what we call here original research. But if you do, knock yourself out. I see no reason for a derogation from our usual rules, which are designed precisely for cases like this. --Macrakis (talk) 20:40, 26 August 2021 (UTC) Just briefly: I'd quote such references if i'd found any. As you suggested, there don't seem to be any. Incorrect. WP says that facts obvious to everyone are NOT "Original-Research", and therefore aren't prohibited from WP articles. By the way, I didn't list aspect-ratio as an advantage. I listed large point-min/max-scale and point-min-scale--and high values for them over a large percentage of the Earth--as advantages. We've already been over this: It doesn't take a journal-article to establish that a map is more usable from across the room if scale is larger. Must I quote an educational journal to establish that readability is better than non-readability? :D Nor is there any shortage of available citations (need I cite them?) that people object to the bad shape that results from low point-min/max-scale. Yes, low aspect-ratio favors a map's rating by global measures of point-min-scale--referenced to the scale along the equator (as it is, as I define it for cylindrical or pseudocylindrical maps). And yes, low aspect-ratio favors a map's rating by av-scale, which I defined with reference to the scale along the equator. I acknowledged that maps & other posted things don't always have width as their fit-critical dimension(Maps often don't have their advantages in all applications.), and that GP's advantages that depend on width being fit-critical don't always obtain. However, posted things, and maps especially, are always posted at a height not close to floor or ceiling...and therefore would compete with eachother for horizontal-space at that middle height. ...if there are enough of them on the wall to compete, as admittedly there aren't always. But I didn't list low aspect-ratio, for its own sake, as an advantage.
edited 03:54 You aren't advancing the discussion. I was suggesting a productive way forward -- start with one claim (aspect ratio was just an example) and write it up with proper reliable sources. See also WP:STICK and WP:IDHT. --Macrakis (talk) 15:24, 27 August 2021 (UTC) Sorry, but the answers to your objections don't change when you repeat the objections. So yes I repeated the answers. But yes, it shouldn't have been necessary to do so. User:97.82.109.213 at 2021-8-27T22:12 Oh, one other thing I should mention: I pointed out that the OR rule, by its own wording, doesn’t apply to things obvious to everyone, and I suggested an exception to the verification by RS rule, and told how I justify the exception. I told why it would improve the article. I asked for reasons why the exception, in this instance, would be detrimental to the article.\ The answers that I got consisted of repetition of the policy to which I’d suggested an exception. No, as I’ve already pointed out, the policy itself can’t be used as a reason why it can’t or shouldn’t have an exception. But if you don’t have a reason why the exception would be detrimental to the article, I don’t care. The fact that you didn’t give a reason when asked for one will be helpful when I later take the matter to Wikipedia administration. Given the current ideological-POV demographic-composition among the editors at this article, it’ obvious that the GP article will never have balance or objectivity, or a pros/cons section, without the help of administrative enforcement. As I’ve said, that would probably be a lengthy process--a project that it isn’t possible for me to embark on just yet. User:97.82.109.213 at 2021-8-29T22:12
This comment is relevant to the article, because it’s something that should be in the article, in the Disadvantages section (…if there were one, as there should be.) Yes, GP, at is equator, has a point-min/max-scale of only .5 But, you know, it’s common for equal-area maps to have point-min/max-scale as low as .5 or lower at some place on the map. So, as a practical matter, yes GP might be inconvenient to use where the point-min/max-scale is so low. But likewise on other equal-area maps that have a point-min/max-scale that low somewhere. Yes, what people object to about GP is that its low point-min/max-scale occurs at in the tropics, and, in particular, even at the center of the map. That makes the resulting unrealism much more blatant and in-your-face. That’s why some people don’t like GP. An answer to that: Realism isn’t everything. If you want it to really look like the Earth, then put on your wall a photo of the Earth from space. A map is intended to map the Earth, not impersonate it. And if you find GP unaesthetic, then remember Salvador Dali. Maybe GP’s name should be changed to the Salvador Dali Projection. Relevant to GP's advantage: GP can only be recommended for a special situation: A wall that's crowded, with competition for horizontal-space, or soon will be; a need for accurate measurements or examination of relative-position, or distant-examination; a requirement to use only maps currently for sale (i.e. CEA-Stack not available). Without those conditions, of course Behrmann would be much better than GP, due to its good shape over 2/3 of the Earth's surface. In fact, for a horizontally-crowded wall, a twice-interrupted world-map, with 2 separate maps, each mapping half of the Earth's longitude, with the two maps mounted one over the other, would beat a one-piece GP map, by geometric-mean scale for a given width, no matter which equal-area projection is used. For example, a twice-interrupted, vertically-arranged, Behrmann or Sinusoidal world-map would beat a 1-piece GP map, by geometric-mean-scale for a given width. And of course it goes without saying that the twice-interruption would reduce Sinusoidal's peripheral distortion. — Preceding unsigned comment added by 97.82.109.213 (talk • contribs) 20:29, September 4, 2021 (UTC)
I took some of the advice (e.g. signing posts; methods for quoting, etc.) Not all of the advice was consistent with actual Wikipedia policy...&/or previous practice at this talk-page. I'd been signing my posts, with a date & time. Yes, I forgot to do so on my most recent post before your comment.
New Comments on January 12th, 2022:Wikipedia’s guidelines are only meant as suggestions, not as exceptionless rules. Wikipedia emphasizes that common-sense can call for an exception to a policy. …and Wikipedia acknowledges that some Wikipedia editors misinterpret policies as excpetionless rules in order to prevent the inclusion of material that they personally dislike. …as is the case here, when we have people trying to claim that Gall-Peters’ advantages can’t be mentioned in the article (making it impossible to have a pros/cons section), because “reliable sources” don’t talk about Gall-Peters’ advantages (…and the resident cartographer here refuses to answer a simple straightforward Y/N question about one of the advantages). Well, I’ve asked a cartographer here, at this article talk-page, the following question: “Is it or is it not true that, on Gall-Peters, nowhere between lat 60 north & lat 60 south, is the scale at any point, in any direction, less than the scale along the equator & on the reference-globe or generating-globe?” Yes or no. It’s a simple enough question, and not one that should be a problem for any genuine cartographer. And yet the resident cartographer at this article refused to answer the question. Not only does our resident cartographer here refuse to say that it’s so. He refuses to say that it isn’t so. Is that because it’s unknown or unknowable ? :-D No, it’s a straightforward y/n question easily-determinable matter BTW, the region between lat 60 N & 60 S comprises about 86.6 % of the Earth’s surface. So here’s another question or our resident cartographer: What other equal-area world-map has scale at least as great as the scale on the map’s equator & reference-globe, everywhere, in every direction, over 86.6% of the Earth’s surface? (…other than other CEA maps such as Balthasart, Square Tober CEA, & CEA-Stack.) Does anyone really believe that a refusal to answer those questions will successfully keep that GP advantage out of the article, when the matter is appealed to Wikipedia administration? BTW, CEA-Stack completely dominates GP. On CEA-Stack, with its Behrmann main-map, and with three added northern high-lat sections, CEA-Stack shows about 99% of the north-of-the equator part of the Earth with scale, in every direction at every point, at least equal to the scale along the equator. …and shows about 95% of the north-half of the Earth with “good shape”, by which I mean point-min/max scale of at least ¾ (That’s the point-min/max scale at Behrmann’s equator). …and that CEA-Stack version accomplishes all that, with an aspect ratio that’s a near-perfect fit to an 8.5X11 sheet of computer-paper. GP has good shape over only 21.3 % of the Earth’s surface. (The high-lat sections wouldn’t be needed in the South, where even the first one would be needed by only a small amount of land at the tip of South-America. (…unless one is very interested in Antarctica.) Of course, if desired, one high-lat section could be added in the South, for good scale & shape even in that tip of South-America…the Southernmost inhabited continental land.) BTW, even ordinary Behrmann CEA easily beats Equal-Earth, with good-shape, over 2/3 of the Earth’s surface. …& with point-min-scale at least equal to scale along equator, over 2/3 of the Earth’s surface. User:97.82.109.213 at 2021-1-12T12:55 — Preceding unsigned comment added by 96.39.179.76 (talk) 09:55, 12 January 2022 (UTC)
First just a quick comment: How very bizarre, to claim that point-min-scale doesn't matter. Look at high-lat peripheral places on Sinusoidal, or at the top of any line-pole equal-area map, and say that :-D. In a classroom, it's often necessary to observe a map from a distance, because not all of the seats in the room can be close to the map. The distance at which a short map-distance can be discerned or compared is proportional to the map's scale at the point & direction of interest. If scale didn't matter, there'd be no reason for atlases to typically use a very large format, compared to other books. There'd be no reason for wall-maps to be roughly 3'X4' instead of postcard-size. Why equator-length & scale are a meaningful reference: On many or most Cylindroid (Cylindrical or Pseudocylindrical) maps, the scale along the equator is equal to the scale on the surface of the reference-globe, the generating-globe. (Yes, the CEA maps other than Lambert are often spoken of as being on a cylinder that intersects the reference-globe. But the non-Lambert CEA maps can also fairly be regarded as just vertically-magnified Lambert maps, sharing Lambert's reference/generating globe.) Scale-factor on a map is, by its definition, referenced to the scale on the reference or generating globe. Additionally, as you'll find nearly any time when there's space-competition on a wall, it's the horizontal-space that's in short supply. That makes the equator-length & scale the most useful length & scale reference. User:97.82.109.213 at 2021-1-12T0042 — Preceding unsigned comment added by 96.39.179.76 (talk) 00:42, 13 January 2022 (UTC) I compared the aspect-ratio of a certain version of CEA-Stack to that of an 8.5X11 inch sheet of computer-paper, not because I advocate printing maps only on 8.5X11 sheets, but rather as a way of telling the shape of the map, its aspect-ratio. That (11/8.5) aspect-ratio is a convenient and not very atypical shape for a wall-map or book-page. I wanted to emphasize that the powerful properties-improvements achieved by CEA-Stavk don[t require an unreasonably or particularly unusually tall map. — Preceding unsigned comment added by 96.39.179.76 (talk) 01:10, 13 January 2022 (UTC) we could argue indefinitely about whether these criteria are meaningful, but I'm starting to realize it's not productive. why don't we try to compromise by adding a paragraph about GP's pros that are based on RS? I would propose something like the following, added to the bottom of the "Cartographic Reception" section.
Justin Kunimune (talk) 13:39, 13 January 2022 (UTC)
[quote] we could argue indefinitely about whether these criteria are meaningful, but I'm starting to realize it's not productive. [/quote] You got that right. The matter of what’s “meaningful” is a subjective matter of opinion & personal-feeling. There are no RSs on subjective matters of opinion or personal-feeling. Cartographers, and the publications that publish them, are reliable when stating objective, verifiable mathematical facts. Cartographers, & the publications that publish then, are reliable when stating their personal subjective opinions, personal feelings, & POV. Cartographers, & the publications that publish them, are not reliable regarding subjective matters such as their opinion regarding what others should consider important (…but they can reliably tell us mathematical facts that might influence people’s perception of importance.) When you call certain publications “Reliable-Source”, regarding subjective judgments of importance, that’s nonsense, and it just elevates some group’s POV to governing-status. So, how can Wikipedia say anything about such matter? Easy. Without calling it a debate (because it wouldn’t be an ongoing conversation in the article), in any instance with two sizable groups ( such as people who like GP, & people who don’t like GP), then just let each of those 2 groups state why they consider GP’s advantages or disadvantages to be. …& how they support their claims about importance. I’m not claiming that point-min-scale, referenced to map-width, is always important. But it’s important when map-width is the fit-critical dimension. …as it undeniably sometimes is. …and as it usually is in wall-mounting, when fit & crowding is a problem. If Strebe wants to claim that point-min-scale is irrelevant, then I invite him to share with us why he believes that. I’ve told why I claim that point-min-scale matters. If & when Strebe feels ready to, he should be permitted to say why he thinks that point-min-scale is irrelevant, or in what way my argument that it’s relevant is incorrect. Sorry, but that’s the best that you can do on a fundamentally subjective matter. You can tell about the mathematics, but the importance-judgment comes down to subjective opinion…for which reasons can and should be given. Now hear this: Don’t use GP when map-height is the fit-critical dimension! Behrmann, or maybe even Lambert, would be better then. When there’ll likely be crowding, but it isn’t clear which dimension will be more fit-critical than the other, or it’s known that neither will be more fit-critical than the other, then of course space-efficiency is what matters, regarding the matter of av-scale, point-min-scales, or room for map-detail & labeling. When that doesn’t even matter, because the map will be on a large bare wall with no space-competition, and you can make the map as big as you want, to make any place’s point-min-scale as large as you want, regardless of the projection…then, obviously, shapes, point-min/max-scale, becomes what matters. Behrmann does excellently, with point-min/max scale >= 3/4 , over about 2/3 of the Earth’s surface. GP’s inaccurate tropical shapes are unrealistic & inconvenient, and, to some, aesthetically-disturbing. …but not use-prohibitive. Looking at the equator? Then I remind you that shapes there are really only half as NS-tall as they’re shown. ...as regards the ratio between NS dimension & EW dimension. Looking at the top or bottom of Africa? Then I remind you that the shapes there are only about 2/3 as NS-tall as they appear. ...as regards the ratio between NS dimension & EW dimension. Insufficient point-min-scale for precise measurements or viewing at a distance can be use-prohibitive. GP excels at good point-min-scale, having good point-min-scale over the inhabited latitudes. …out to lat +/- 60. That’s 86.6% of the Earth’s surface, out to the approximate latitude of Oslo, Stockholm & Helsinki. I define “good point-min-scale” as point-min-scale >= the scale along the map’s equator. I’ve told why that’s often, though not always, important. Very often, an advantage only sometimes obtains, depending on conditions. It’s nonetheless an advantage. Oh yes, & there’s the matter of the reliability of mathematical facts that are stated. Well, anyone can challenge the accuracy of a fact. And no, that isn’t prohibitively time-consuming. It’s common practice everywhere but here. It isn’t complicated: Someone states a fact. Maybe (or maybe not) someone else challenges it…either by asking for verification, or telling why it isn’t true. Of course merely proving that there’s a consensus among reliably-credentialed people, that it isn’t so is sufficient to refute an alleged objective mathematical fact. e.g. Strebe could tell us why he believes that GP doesn’t have point-min-scale >= the scale along the equator, between lat -60 & lat +60. …or point to an expert-consensus that GP’s lat-range of good scale is less than that. That’s how the accuracy of an objective mathematical fact can be verified or refuted. 96.39.179.76 at 2022-1-15 at 0149 UT — Preceding unsigned comment added by 96.39.179.76 (talk) 01:48, 15 January 2022 (UTC)
"Reliable source" does not mean "cartographer". RSs include respected peer-reviewed papers, news articles from established outlets, and published books. And RSs are reliable when stating what is important enough to mention. Using RSs this way does elevate some groups' POV to governing status, but that's how Wikipedia is supposed to work. Someone's POV needs to decide what is relevant and what isn't. It could conceivably come from a sizeable group of people selected to represent two sides of an argument, as you propose. But the creators and maintainers of Wikipedia have decided follow RSs. If Wikipedia was a scientific journal or a news agency, then of course that would be insufficient. We would have to verify all facts, weigh opinions by how well-supported they are, and adjust the narrative to represent all sides fairly. However, while journals and news agencies do exist, Wikipedia is not one of them. Wikipedia is a way for people to access published information in one place for free. If you think it would be better to gather a sizable group of people, ask them what they think is good about the Gall Peters Projection and why, and list the pros and cons that they identify, then I encourage you to do so and publish the result as a paper or news article or book. If you want more people to know that they should use GP when the width is the fit-critical dimension, then start a blog about map projections and post it there. But until they are published in an RS, these things do not belong on a Wikipedia article. Justin Kunimune (talk) 15:49, 15 January 2022 (UTC) Justin-- we've been over this. There are facts that are far too blatantly, ridiculously obvious to require a citation. 96.39.179.76 at 2022-1-15T2305 — Preceding unsigned comment added by 96.39.179.76 (talk) 23:04, 15 January 2022 (UTC) Meters-- In case you haven't noticed, I've been signing nearly all of my posts. I tried the tildes. They don't work for me. I don't know or care why. I had a registration here, & have been told that I must still have one. I've tried to sign with it, via the tildes. But, since that doesn't work, I've been signing via my ISP. You want brevity? Then delete, from the article, all of the entirely-irrelevant material about about cartographer's emotional reaction to Arno, & about Arno's claims, etc. Arno Peters wasn't the introducer of GP, and all that material about him & what he said, & cartographers' reaction to him bears no relation whatsoever to James Gall's CEA version. All that Arno material could & should be moved the the Wikipedia article about Arno Peters. The GP article should be only about GP as a map-projection. 96.39.179.76 (talk) 23:15, 15 January 2022 (UTC)
[quote] So, after five months and almost 135 k of talk page discussion you've dropped your idea of adding a section on properties, advantages and disadvantages? [/quote] No. I said no such thing. But obviously any progress in that matter will depend on taking the matter to Wikipedia administration, and it might be a while before I have time to give the amount of time it deserves, to that--likely lengthy-- project. [quote] OK, well then I suggest that you start a new talk page section to discuss what you now suggest we remove from the article. [/quote] Yes, that calls for a separate section. Getting the projection-irrelevant material our of the article...and moving it to the Arno Peters Wikipedia article.
My claims are verifiable, by asking any cartographer (..or, rather any cartographer who is willing to answer :-) Anyway, Wikipedia is explicit about not requiring verification for things that are obvious. Additionally, relevance is often a subjective individual matter, and there's no such thing as an RS on a subjective matter. Strebe says that point-min-scale is irrelevant. Why? He isn't saying! :-) "Relevant" needn't mean "Important & necessary in every instance." For relevance, it's sufficient that there are non-rare instance in which the fact is useful. It's just blatantly, ridiculously, undeniably obvious that there are instances in which point-min-scale matters. What about the fact that there could be instance in which map-width isn't the fit-critical dimension. Again, the extent or size of the region of good point-min-scale,referenced to map-width, is only important when width is the critical dimension. But that's sometimes the case, which is enough for the extent of size of the region of good point-min-scale to be relevant. And, BTW, if you've ever fit maps to a wall where there's competition for space, you'll have found that it's usually horizontal-space for which there's competition. Book-pages? The aspect ratio of most book-pages is less than the aspect-ratio of most equal-area world-maps. And the aspect-ratio of the combination of two facing-pages, too, is usually less than the aspect-ratio of most equal-area world-maps. ...meaning that, again, map-width is usually the fit-critical dimension. So when there's any question about fit, map-width is more likely than map-height, to be the fit-critical dimension. On Wikipedia, "verifiable" means that it exists in a RS somewhere even if that RS hasn't been cited. In this case, what's being questioned is not whether the claims are factually correct, but whether they are relevant, so obviousness does not exclude them from the need for verifiability. Justin Kunimune (talk) 12:39, 18 January 2022 (UTC) Do you really think that you have an RS regarding what people should regard as relevant to them? 96.39.179.76 (talk) 04:36, 19 January 2022 (UTC) (That's my tilde signature.) I should add that, in addition to the size & extent of the region of good-scale (which I define as scale at least equal to the scale along the equator), also important is av-scale. ...because, if, at some future time, you might need to distinguish between, or judge distance between, two nearby points, either minutely, or from a distance, you can't know now at what point on the Earth or in what direction, the scale of interest will be. By all of the abovementioned point-min-scale standards, Gall-Peters beats every (interrupted on only one meridian) equal-area world map that has ever been in print for sale. Angular-error &/or low point-min/max scale can be unrealistic, a nuisance,an inconvenience, & an aesthetic-fault. ...but too low a point-min-scale can make a map unusable at some particular distance, for some pair of points sufficiently close on the map. 96.39.179.76 (talk) 04:51, 19 January 2022 (UTC)
No time to reply to everything right now, but I'll just point out the following: Gall-Peters is by far the most popular equal-area world-map. Nothing else comes even remotely close. You're engaged in a desperate stonewalling effort, against the overwhelmingly most preferred equal-area world-map. So GP's advantages are irrelevant because some editor doesn't publish about them? So your WP article consists only of nasty inimical POV, & your resident cartographer refuses to say whether or not GP has point-min-scale >= the scale along the equator from lat 60 south to lat 60 north, up to Oslo, Stockholm & Helsinki...86.6% of the Earth's surface, because...he says that's irrelevant...but won't say why. ...presumably consistent with your notion of verification? :-D Scale, space, area. That's what encompasses, contains & supports everything that a map displays. ...and GP has more of that, for a given width, than any one-piece equal-area map that's ever been in print for sale. ....but it's irrelevant because no article (by a cartographer, or some newspaper editor) says it's relevant?? :-D Sorry, but that those above-stated facts don't require a notable citation. :-D 96.39.179.76 (talk) 21:03, 23 January 2022 (UTC) — Preceding unsigned comment added by 96.39.179.76 (talk) 21:00, 23 January 2022 (UTC) |
