{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"ProjectedCRS","name":"IGN Astro 1960 / UTM zone 30N","base_crs":{"type":"GeographicCRS","name":"IGN Astro 1960","datum":{"type":"GeodeticReferenceFrame","name":"IGN Astro 1960","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"}]},"id":{"authority":"EPSG","code":4700},"remarks":"Mining title descriptions referring only to \"Clarke 1880 ellipsoid\" should be assumed to be referenced to this CRS. Oil industry considers Mining Cadastre 1999 to be exactly defined through tfm codes 15857-9. Replaced by Mauritania 1999 (code 4702)."},"conversion":{"name":"UTM zone 30N","method":{"name":"Transverse Mercator","id":{"authority":"EPSG","code":9807}},"parameters":[{"name":"Latitude of natural origin","value":0,"unit":"degree","id":{"authority":"EPSG","code":8801}},{"name":"Longitude of natural origin","value":-3,"unit":"degree","id":{"authority":"EPSG","code":8802}},{"name":"Scale factor at natural origin","value":0.9996,"unit":"unity","id":{"authority":"EPSG","code":8805}},{"name":"False easting","value":500000,"unit":"metre","id":{"authority":"EPSG","code":8806}},{"name":"False northing","value":0,"unit":"metre","id":{"authority":"EPSG","code":8807}}]},"coordinate_system":{"subtype":"Cartesian","axis":[{"name":"Easting","abbreviation":"E","direction":"east","unit":"metre"},{"name":"Northing","abbreviation":"N","direction":"north","unit":"metre"}]},"scope":"Topographic mapping (small scale).","area":"Mauritania - east of 6°W.","bbox":{"south_latitude":15.49,"west_longitude":-6,"north_latitude":25.74,"east_longitude":-4.8},"id":{"authority":"EPSG","code":3369}}