Alcance
This document supports the definition of:— A Discrete Global Grid Systems (DGGS) core comprising:— an RS using zonal identifiers with structured geometry, and— functions providing import, export and topological query,— Common spatio-temporal classes for geometry, topology, RS using zonal identifiers, zonal identifiers and zones, based on ISO 19111 CRS. The spatio-temporal scope is constrained to:— spatial elements that are invariant through all time, and— temporal elements that are invariant across all space.— Equal-Area Earth Reference Systems (EAERSs) for Equal-Area Earth DGGS.