VERTCRS["Hon Dau 1992 height",VDATUM["Hon Dau 1992"],CS[vertical,1],AXIS["gravity-related height (H)",up,LENGTHUNIT["metre",1]],USAGE[SCOPE["Geodesy, engineering survey."],AREA["Vietnam - mainland onshore."],BBOX[8.33,102.14,23.4,109.53]],ID["EPSG",5727]]