Geodesy.
Locally sometimes referred to as ITRF2005, this is not strictly correct as it applies only at epoch 2008.38 and ignores subsequent tectonic plate motion.
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "Macao Geodetic Datum 2008", "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 }, "scope": "Geodesy.", "area": "China - Macao - onshore and offshore.", "bbox": { "south_latitude": 22.06, "west_longitude": 113.52, "north_latitude": 22.23, "east_longitude": 113.68 }, "id": { "authority": "EPSG", "code": 1208 } }