Ellipsoid: WGS 84
Prime meridian: Greenwich
Data source: EPSG
Information source: IGN Paris.
Revision date: 2004-03-26
Scope: Geodesy, cadastre, engineering survey, topographic mapping.
Remarks: Replaces Fort Marigot and Sainte Anne (datum codes 6621-22) in Guadeloupe and Fort Desaix (datum code 6625) in Martinique.
Definition: OGC Well Known Text
DATUM["Reseau_de_Reference_des_Antilles_Francaises_1991", SPHEROID["WGS 84",6378137,298.257223563, AUTHORITY["EPSG","7030"]], AUTHORITY["EPSG","6640"]]
Definition: OGC Well Known Text 2 (2019)
DATUM["Reseau de Reference des Antilles Francaises 1991", ELLIPSOID["WGS 84",6378137,298.257223563, LENGTHUNIT["metre",1]], ID["EPSG",6640]]
Definition: ESRI Well Known Text
DATUM["D_RRAF_1991", SPHEROID["WGS_1984",6378137.0,298.257223563]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.5/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "Reseau de Reference des Antilles Francaises 1991", "ellipsoid": { "name": "WGS 84", "semi_major_axis": 6378137, "inverse_flattening": 298.257223563 }, "scope": "Geodesy, cadastre, engineering survey, topographic mapping.", "area": "French Antilles onshore and offshore - Guadeloupe (including Grande Terre, Basse Terre, Marie Galante, Les Saintes, Iles de la Petite Terre, La Desirade); Martinique; St Barthélemy; St Martin.", "bbox": { "south_latitude": 14.08, "west_longitude": -63.66, "north_latitude": 18.53, "east_longitude": -57.52 }, "id": { "authority": "EPSG", "code": 6640 } }