Well Known Text
 
WKT Version 2
COORDINATEOPERATION["NTF (Paris) to NTF (1)",VERSION["IGN-Fra"],SOURCECRS[GEOGCRS["NTF (Paris)",DATUM["Nouvelle Triangulation Francaise (Paris)",ELLIPSOID["Clarke 1880 (IGN)",6378249.2,293.466021293627,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",7011]],ID["EPSG",6807]],PRIMEM["Paris",0.040792344,ANGLEUNIT["radian",1,ID["EPSG",9101]],ID["EPSG",8903]],CS[ellipsoidal,2,ID["EPSG",6403]],AXIS["Geodetic latitude (Lat)",north],AXIS["Geodetic longitude (Lon)",east],ANGLEUNIT["grad",0.0157079632679489,ID["EPSG",9105]],ID["EPSG",4807]]],TARGETCRS[GEOGCRS["NTF",DATUM["Nouvelle Triangulation Francaise",ELLIPSOID["Clarke 1880 (IGN)",6378249.2,293.466021293627,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",7011]],ID["EPSG",6275]],CS[ellipsoidal,2,ID["EPSG",6422]],AXIS["Geodetic latitude (Lat)",north],AXIS["Geodetic longitude (Lon)",east],ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],ID["EPSG",4275]]],METHOD["Longitude rotation",ID["EPSG",9601]],PARAMETER["Longitude offset",2.5969213,ANGLEUNIT["grad",0.0157079632679489,ID["EPSG",9105]],ID["EPSG",8602]],OPERATIONACCURACY[0],ID["EPSG",1763]]