Geodesy, topographic mapping.
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "Helle 1954", "ellipsoid": { "name": "International 1924", "semi_major_axis": 6378388, "inverse_flattening": 297 }, "scope": "Geodesy, topographic mapping.", "area": "Jan Mayen - onshore.", "bbox": { "south_latitude": 70.75, "west_longitude": -9.17, "north_latitude": 71.24, "east_longitude": -7.87 }, "id": { "authority": "EPSG", "code": 6660 } }