30731=PROJCS["Nord Sahara 1959 / UTM zone 31N",GEOGCS["Nord Sahara 1959",DATUM["Nord_Sahara_1959",SPHEROID["Clarke 1880 (RGS)",6378249.145,293.465],TOWGS84[-156.5,-87.2,285.9,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4307"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",3],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","30731"]]