Topographic mapping.
Adjustment includes Morocco and Tunisia but use only in Algeria. Within Algeria the adjustment is north of 32°N but use has been extended southwards in many disconnected projects, some based on independent astro stations rather than the geodetic network.
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "Nord Sahara 1959", "ellipsoid": { "name": "Clarke 1880 (RGS)", "semi_major_axis": 6378249.145, "inverse_flattening": 293.465 }, "scope": "Topographic mapping.", "area": "Algeria - onshore and offshore.", "bbox": { "south_latitude": 18.97, "west_longitude": -8.67, "north_latitude": 38.8, "east_longitude": 11.99 }, "id": { "authority": "EPSG", "code": 6307 } }