Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "Madrid 1870 (Madrid)", "ellipsoid": { "name": "Struve 1860", "semi_major_axis": 6378298.3, "inverse_flattening": 294.73 }, "prime_meridian": { "name": "Madrid", "longitude": -3.687375 }, "scope": "Topographic mapping.", "area": "Spain - mainland onshore.", "bbox": { "south_latitude": 35.95, "west_longitude": -9.37, "north_latitude": 43.82, "east_longitude": 3.39 }, "id": { "authority": "EPSG", "code": 6903 } }