Geodesy, topographic mapping.
Based on ETRS89 as established during the 1992 Baltic campaign. Replaced by Estonia 1997 adjustment (code 6180).
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "Estonia 1992", "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 }, "scope": "Geodesy, topographic mapping.", "area": "Estonia - onshore.", "bbox": { "south_latitude": 57.52, "west_longitude": 21.74, "north_latitude": 59.75, "east_longitude": 28.2 }, "id": { "authority": "EPSG", "code": 6133 } }