Geodesy, cadastre, engineering survey, topographic mapping.
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "Hanoi 1972", "ellipsoid": { "name": "Krassowsky 1940", "semi_major_axis": 6378245, "inverse_flattening": 298.3 }, "scope": "Geodesy, cadastre, engineering survey, topographic mapping.", "area": "Vietnam - onshore.", "bbox": { "south_latitude": 8.33, "west_longitude": 102.14, "north_latitude": 23.4, "east_longitude": 109.53 }, "id": { "authority": "EPSG", "code": 6147 } }