VERT_CS["NIVELLEMENT GENERAL DE GUYANE (NGG) 1977",VERT_DATUM["NIVELLEMENT GENERAL DE GUYANE (NGG) 1977",2005,AUTHORITY["IGNF","REA016"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["IGNF","GUYA77"]]