Geodesy, cadastre, engineering survey, topographic mapping.
Replaced by CIGD11 (datum code 1100).
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "Sister Islands Geodetic Datum 1961", "ellipsoid": { "name": "Clarke 1866", "semi_major_axis": 6378206.4, "semi_minor_axis": 6356583.8 }, "scope": "Geodesy, cadastre, engineering survey, topographic mapping.", "area": "Cayman Islands - Little Cayman and Cayman Brac.", "bbox": { "south_latitude": 19.63, "west_longitude": -80.14, "north_latitude": 19.78, "east_longitude": -79.69 }, "id": { "authority": "EPSG", "code": 6726 } }