DGGS specs

[benbovy]

There's a draft for DGGS specs here: https://github.com/danlooo/dggs-data-spec. Maybe worth to look at it and see if/how we can conform to it (regarding the coordinates, their attributes, serialization, etc.).

A Julia implementation: https://github.com/danlooo/DGGS.jl. We could get inspiration (see their tutorials) for the API.

[benbovy]

OGC specs (draft): https://github.com/opengeospatial/ogcapi-discrete-global-grid-systems

[allixender]

The OGC is currently discussing ways to describe and identify unique DGGS types. This is slightly different from storing DGGS data. But the important info here is to be able to store the metadata about the specifics of the used DGGS in form e.g. an identifier, label, link to a detailed definition. This would likely need to include the main type e.g. H3, S2, HEALPIX, RHEALPIX, DGGGRID_ISEAxxx, but also required parameters like HEALPIX (indexing: nested or ring), RHEALPIX (ellipsoid, orientation/rotation ..), DGGRID-icosahedron-based DGGS types (orientation, potentially mixed apertures..), GeoSOT. It would be good to have synergies here and not reinvent the wheel.