Geodesy.
Based on 78 control points with coordinates determined in ETRS89.
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "Croatian Terrestrial Reference System", "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 }, "scope": "Geodesy.", "area": "Croatia - onshore and offshore.", "bbox": { "south_latitude": 41.62, "west_longitude": 13, "north_latitude": 46.54, "east_longitude": 19.43 }, "id": { "authority": "EPSG", "code": 6761 } }