Talk:Discrete global grid

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	This article was accepted from this draft on 21 October 2015 by reviewer SwisterTwister (talk · contribs).

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Check

Other examples of DGG-variants for geocoding: http://geocode-encyclopedia.info
Terminology, names for projection types: List_of_map_projections
comparisons:
- https://www.fulcrumapp.com/blog/comparing-address-and-coordinate-systems/
- http://www2.unb.ca/~estef/papers/go_geomatics_stefanakis_march_2016.pdf
....

Other DGGs:

http://near-goos.jodc.go.jp/data_format/position-code.html
Japan grid square code (JIS X 0410): [pyjpmesh](https://github.com/ymoch/pyjpmesh), ...check other (link working?), [ref1](https://ieeexplore.ieee.org/document/8258450/), [ref2](http://www.j-shis.bosai.go.jp/en/faq-250mmesh#more-42)
- A 250m-mesh is a square area of 7.5 arc-seconds latitude x 11.25 arc-seconds longitude (about 250m x 250m). This geographical coordinate system adopts the standard grid square (mesh code N) based on Tokyo Datum. 250m-mesh code is a part of the divided grid square code defined by JIS X 0410/AMENDMENT1:2002.

Review all article using OGC standard

The new OGC DGGS standard entitled “Topic 21: Discrete Global Grid Systems Abstract Specification” is online! It includes important information on definitions, conventions, functional algorithms, the core data model and more... see:

HTML https://docs.opengeospatial.org/as/15-104r5/15-104r5.html
PDF https://portal.opengeospatial.org/files/15-104r5
Problem Statement at http://www.opengeospatial.org/projects/groups/dggsdwg

Krauss (talk) 23:51, 19 April 2019 (UTC)[reply]

You can use also didactic texts and discussions:

grabularity

What does grabularity mean? Should this be granularity? — Preceding unsigned comment added by 67.188.178.167 (talk) 03:19, 15 December 2018 (UTC)[reply]

corrected

Notes about key-words and references

About S2 geometry, the cube as used before "S2 Geometry", by "SAND" in the end of 1990s, see http://www.cs.umd.edu/~hjs/pubs/alborzidgg00.pdf
"Fine grid" and "Coarse grid" (or grid cells). Example of use of the terms in this CFD article (CFD = Computational Fluid Dynamics)
...

About flat and hierarchical grids

The term "flat" is perhaps preferable to the term "non-hierarchical". See "flat vs hierarchical" organizations, design architectures, clusters, structures, etc. About properties, see this didactic article comparing both for spatial-partition in games, as decisions:

flat grid, advantages:
- Simpler: the flat data structure is simpler, and it is simpler to implement.
- Memory usage is constant. (spatial partition can often be fixed ahead of time).
- Faster: it can be faster to calculate or update, when objects change their positions.

hierarchical grid, advantages:
- It handles empty space more efficiently.
- Neighboring objects can be moved quickly.
- The partitions can be imbalanced. When objects clump together, you get better performance, avoiding to waste memory in the empty areas.

Grid classification

It is possible to adapt Grid classification article, and generalize relationships of the DGG areas...