4
votes
Is there a FOSS implementation for Discrete Global Grid System & Global Statistical Geospatial Framework?
Not yet. However, I agree with your interpretation that several are close and one of the OGC DGGS working group key activities is to establish a registry of DGGS implementations so this is likely to ...
- 449
4
votes
Accepted
Uber H3 DGGS: Table of largest hexagons per resolution?
We don't have a table like this, though we do have a ticket to create one FWIW. For max and min, you don't have to iterate over the entire grid.
The smallest cells are the pentagons at the vertices ...
- 336
4
votes
Accepted
Why are my icosahedron triangle subdivisions not equilateral (PostGIS)?
Yes, this is due to the tiled icosahedron to-sphere projections. I think of this process as:
Take a normal icosahedron, all corners lie on the same sphere, and therefore, the distance is also the same,...
- 1,230
3
votes
Accepted
Converting line to set of H3 hexagons?
I think this is fine, with two caveats:
You should preserve order by using an ordered data structure (and not an unordered set).
You should allow for some repetitions by using a data structure that ...
- 8,953
1
vote
Accepted
How to obtain the minimal covering of a circle with H3 hexagons?
One option would be to calculate your polygon as you are now (though I'd probably use a popular geometry library like Shapely rather than my own circle buffering algorithm), but only with a buffer of ...
- 8,953
1
vote
Converting line to set of H3 hexagons?
Solution above proposed by @alphabetasoup works very well with H3 version 3.x
With H3 version 4.x you need to follow the migration documentation and make the following replacements:
replace geo_to_h3 ...
- 131
1
vote
Converting line to set of H3 hexagons?
I want to share a discussion from a Github issue. I think it is valuable regarding the question.
Nick Rabinowitz said
Your approach is what I would have recommended. h3_line has some
limitations here ...
- 133
1
vote
Converting line to set of H3 hexagons?
Same problem, similar solution. Only one additional step that seemed to provide a smoother / more accurate result (i.e., H3s that more closely follow the shape of the line).
For each set of points ...
- 11
1
vote
How to use ISEA projection?
A map projection is a 2D transformation (in mathematical terms; in cartographic terms it is a conversion), from one reference surface to a plane (or to a developable surface towards a plane).
For ...
- 14.7k
1
vote
How to use ISEA projection?
This is a Wiki (!), please collabore editing here... Or adding a correct and complete answer!
Trying to answer
The problem in "how to use" was the area calculation, so, the alternative ...
1
vote
Distorted h3 hexagons using h3js with Mapbox
Something is definitely off there - while H3 hexagons do have some distortion in various parts of the globe, and while this distortion is further distorted at extreme latitudes when rendered in a ...
- 336
1
vote
DGGS projections with PostGIS or pgLatLon
PostGIS use PROJ.org, and recent PROJ versions has implemented some projections, used in DGGS candidates:
PROJ v8.2+ added S2 Geometry's projection.
PROJ v??+ added QSC projection.
PROJ v??+ added ...
1
vote
Hex grid on EPSG:4326 globe (for use in Leaflet)
https://github.com/mocnik-science/geogrid - The library geogrid provides methods to generate and handle the ISEA Aperture 3 Hexagon Discrete Global Grid System (ISEA3H DGGS) using the Inverse Snyder ...
- 28.3k
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