Module talk:Location map/data/Canada Alberta

	Canada portal This module is within the scope of WikiProject Canada, a collaborative effort to improve the coverage of Canada on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.CanadaWikipedia:WikiProject CanadaTemplate:WikiProject CanadaCanada-related
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Maps

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Transverse Mercator conversion

I've been working on updating and creating a lot of Western Canadian cartographic materials, and I think there are a couple things that could be improved with this locator module.

The vertically exaggerated equirectangular projection causes a lot of distortion, because of Alberta's large extent and high latitude.
The second-level divisions depicted on the map are census geometries of no administrative relevance.

So, I've created an alternative which minimizes distortion by using the province's standard EPSG:3401 transverse Mercator projection, and depicts the same assortment of counties and municipal districts (which do have administrative relevance) seen on other articles about Alberta local government. In order to test it, I've put a copy at Module:Location map/data/Canada Alberta TM, which was probably the wrong thing to do. The code can be seen below:

return {
	name = 'Alberta',
	x = '50 + 796 * 0.5 * ln( ( 1 + cos($1*(pi/180))*sin(($2+115)*(pi/180)) ) / ( 1 - cos($1*(pi/180))*sin(($2+115)*(pi/180)) ) )',
	y = '516.2 - 489*(atan(tan($1*(pi/180))/cos(($2+115)*(pi/180)))+0)',
	image = 'Alberta County Point Locator.svg'
}