Ellipsoid: IAG 1975
Prime meridian: Greenwich
Data source: EPSG
Information source: Chinese Science Bulletin, 2009, 54:2714-2721.
Revision date: 2009-11-24
Scope: Geodesy, engineering survey, topographic mapping.
Area of use: China - onshore.
Definition: OGC Well Known Text
DATUM["Xian_1980", SPHEROID["IAG 1975",6378140,298.257, AUTHORITY["EPSG","7049"]], AUTHORITY["EPSG","6610"]]
Definition: OGC Well Known Text 2 (2019)
DATUM["Xian 1980", ELLIPSOID["IAG 1975",6378140,298.257, LENGTHUNIT["metre",1]], ID["EPSG",6610]]
Definition: ESRI Well Known Text
DATUM["D_Xian_1980", SPHEROID["Xian_1980",6378140.0,298.257]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.5/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "Xian 1980", "ellipsoid": { "name": "IAG 1975", "semi_major_axis": 6378140, "inverse_flattening": 298.257 }, "scope": "Geodesy, engineering survey, topographic mapping.", "area": "China - onshore.", "bbox": { "south_latitude": 18.11, "west_longitude": 73.62, "north_latitude": 53.56, "east_longitude": 134.77 }, "id": { "authority": "EPSG", "code": 6610 } }