Questions tagged [dggs]

Questions related to Discrete Global Grid Systems (DGGS)

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Safe upgrade of PROJ for PostGIS?

Is there a safe way to install fresh PROJ, for example v8.2, in a Debian Linux server, for use with (for example) PostGIS v3? The installation of PROJ was implicit in the PostGIS's, I never do ...
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How to use ISEA projection?

The projection named ISEA - Icosahedral Snyder Equal Area has a (supposedly) good implementation in the PROJ Library, proj.org/isea, that is used by PostGIS, QGIS, etc. The example is agnostic - was ...
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Why are my icosahedron triangle subdivisions not equilateral (PostGIS)?

I am creating a geodesic polyhedron using PostGIS. I am dividing the base icosahedron points (see Appendix A), into the first level of Class I subdivisions. The setup For simplicity let's take just ...
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Generate global grid of circles with minimum overlap with PostGIS

I want to generate a table of geometry points in PostGIS which represent the centers of circles, each with the same radius of X meters, that together form a "grid" that covers the entire ...
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DGGS projections with PostGIS or pgLatLon

Important DGGS projections (like ISEA4T, ISEA4D or ISEA7H variants of ISEA) are free at https://github.com/sahrk/DGGRID , the DGGRID Software Project, but I not see how to use it with PostGIS. Only ...
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Is there a FOSS implementation for Discrete Global Grid System & Global Statistical Geospatial Framework?

This 2019 document, "GSGF Europe -Implementation guide for the Global Statistical Geospatial Framework in Europe" describes the harmonization of two standards: INSPIRE D2.8.I.2_v3.1 of year 2014; OGC'...
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Is there a piecewise-UTM coordinate system?

Is there an EPSG code, WKT or a proj4 string, for a single global piecewise-UTM coordinate system such as MGRS (the NATO military grid reference system)? I suppose this would work similar to the ...
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Uber H3 DGGS: Table of largest hexagons per resolution?

I'm evaluating the use of H3 as a DGGS for a project, and so far I've been unable to find any reference of the area of the largest and smallest hexagons in the grid at each resolution. The "official" ...
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Hex grid on EPSG:4326 globe (for use in Leaflet)

I'm looking for a way to evenly distribute a hexagon grid (x,y,z) on the EPSG:4326 globe. Knowing this is not mathematically possible I'm accepting the following limitations: Poles don't need ...
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