Discrete Global Grid Abstraction Library 0.0.1

DGGAL is a Free & Open-Source (BSD-3-Clause) native, highly efficient library implementing a number of Discrete Global Grid Reference Systems (DGGRS), including all of those defined in the informative Annex B of the OGCAPI - DGGS standard. DGGAL implements DGGRSs based on the Slice and Dice Icosahedral Vertex-oriented great circle Equal-Area (IVEA) projection (van Leeuwen and Strebe, 2006): IVEA3H (aperture 3 hexagonal) and IVEA9R (aperture 9 rhombic). Compared to the ISEA (Snyder) projection, IVEA avoids cusps, yielding more regular zones. Capabilities: - Efficient handling of zones as 64-bit integers across the library, with the ability to resolve these to and from textual zone IDs . - Query the centroid and geometry of a zone in WGS84 or in the DGGRS CRS, facilitating integration and visualization of DGGS data in traditional GIS. - Determine the zone containing a given point at a specified resolution level. - Generate global grids at any refinement levels. - List zone IDs at a particular refinement level within a region of interest, optionally compacted, for targeted spatial analysis or visualization. - Map local sub-zone indices to global zone IDs, enabing support for DGGS-optimized raster and vector data formats such as DGGS-JSON (http://dggs-json.org) and DGGS-JSON-FG. - Identify topological relations such as parent, children and neighboring zones, supporting spatial reasoning for networked geospatial systems.

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