VERTCRS["NGG1977 height",VDATUM["Nivellement General Guyanais 1977"],CS[vertical,1],AXIS["gravity-related height (H)",up,LENGTHUNIT["metre",1]],USAGE[SCOPE["Geodesy, engineering survey, topographic mapping."],AREA["French Guiana - onshore."],BBOX[2.11,-54.61,5.81,-51.61]],ID["EPSG",5755]]