ISO 19170-1:2021

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.