{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"GeographicCRS","name":"Mauritania 1999","datum":{"type":"GeodeticReferenceFrame","name":"Mauritania 1999","ellipsoid":{"name":"Clarke 1880 (RGS)","semi_major_axis":6378249.145,"inverse_flattening":293.465}},"coordinate_system":{"subtype":"ellipsoidal","axis":[{"name":"Geodetic latitude","abbreviation":"Lat","direction":"north","unit":"degree"},{"name":"Geodetic longitude","abbreviation":"Lon","direction":"east","unit":"degree"}]},"scope":"Minerals management (including oil and gas exploration and production).","area":"Mauritania - onshore and offshore.","bbox":{"south_latitude":14.72,"west_longitude":-20.04,"north_latitude":27.3,"east_longitude":-4.8},"id":{"authority":"EPSG","code":4681},"remarks":"Mining title descriptions referring to \"Clarke 1880 ellipsoid\" should be assumed to be referenced to this CRS. Supersedes all earlier local systems."}