mswkt = '''GEOGCS["NTF",DATUM["Nouvelle_Triangulation_Francaise",SPHEROID["Clarke 1880 (IGN)",6378249.2,293.466021293627],EXTENSION["PROJ4_GRIDS","rgf93_ntf.gsb"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4275"]]''' m = mapObj('') m.setWKTProjection(mswkt) lyr = layerObj(m) lyr.setWKTProjection(mswkt)