Well Known Text
WKT Version 2
COMPOUNDCRS["NTF (Paris) / Lambert zone I + NGF-IGN69 height",PROJCRS["NTF (Paris) / Lambert zone I",BASEGEOGCRS["NTF (Paris)",DATUM["Nouvelle Triangulation Francaise (Paris)",ELLIPSOID["Clarke 1880 (IGN)",6378249.2,293.466021293626,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]],ID["EPSG",4807]],CONVERSION["Lambert zone I",METHOD["Lambert Conic Conformal (1SP)",ID["EPSG",9801]],PARAMETER["Latitude of natural origin",55,ANGLEUNIT["grad",0.015707963267949,ID["EPSG",9105]],ID["EPSG",8801]],PARAMETER["Longitude of natural origin",0,ANGLEUNIT["grad",0.015707963267949,ID["EPSG",9105]],ID["EPSG",8802]],PARAMETER["Scale factor at natural origin",0.999877341,SCALEUNIT["unity",1,ID["EPSG",9201]],ID["EPSG",8805]],PARAMETER["False easting",600000,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",8806]],PARAMETER["False northing",1200000,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",8807]],ID["EPSG",18081]],CS[Cartesian,2,ID["EPSG",4499]],AXIS["Easting (X)",east],AXIS["Northing (Y)",north],LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",27571]],VERTCRS["NGF-IGN69 height",VDATUM["Nivellement General de la France - IGN69",ID["EPSG",5119]],CS[vertical,1,ID["EPSG",6499]],AXIS["Gravity-related height (H)",up],LENGTHUNIT["metre",1,ID["EPSG",9001]],GEOIDMODEL["ETRS89-FRA [RGF93 v2] to NGF-IGN69 height (2)",ID["EPSG",8371]],GEOIDMODEL["ETRS89-FRA [RGF93 v2] to NGF-IGN69 height (3)",ID["EPSG",8885]],GEOIDMODEL["ETRS89-FRA [RGF93 v2b] to NGF-IGN69 height (4)",ID["EPSG",9786]],GEOIDMODEL["ETRS89-FRA [RGF93 v2b] to NGF-IGN69 height (5)",ID["EPSG",9876]],ID["EPSG",5720]],ID["EPSG",5707]]