VERTCRS["NIVELLEMENT GENERAL DU LUXEMBOURG",
    VDATUM["NORMAL NULL (NIVELLEMENT GENERAL DU LUXEMBOURG NG-L)"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["NATIONALE A CARACTERE LEGAL"],
        AREA["LUXEMBOURG (pays_cid : 137)"],
        BBOX[49.45,5.73,50.18,6.53]],
    ID["IGNF","NNLUX"]]