Well Known Text
 
WKT Version 2
CONCATENATEDOPERATION["HKPD height to HKCD depth (1)",SOURCECRS[VERTCRS["HKPD height",VDATUM["Hong Kong Principal Datum",ID["EPSG",5135]],CS[vertical,1,ID["EPSG",6499]],AXIS["Gravity-related height (H)",up],LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",5738]]],TARGETCRS[VERTCRS["HKCD depth",VDATUM["Hong Kong Chart Datum",ID["EPSG",5136]],CS[vertical,1,ID["EPSG",6498]],AXIS["Depth (D)",down],LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",5739]]],STEP[CONVERSION["Height <> Depth Conversion",METHOD["Height Depth Reversal",ID["EPSG",1068]],ID["EPSG",7812]]],STEP[COORDINATEOPERATION["HKPD depth to HKCD depth (1)",VERSION["SMO-HK"],SOURCECRS[VERTCRS["HKPD depth",BASEVERTCRS["HKPD height",VDATUM["Hong Kong Principal Datum",ID["EPSG",5135]],ID["EPSG",5738]],DERIVINGCONVERSION["Height <> Depth Conversion",METHOD["Height Depth Reversal",ID["EPSG",1068]],ID["EPSG",7812]],CS[vertical,1,ID["EPSG",6498]],AXIS["Depth (D)",down],LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",7976]]],TARGETCRS[VERTCRS["HKCD depth",VDATUM["Hong Kong Chart Datum",ID["EPSG",5136]],CS[vertical,1,ID["EPSG",6498]],AXIS["Depth (D)",down],LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",5739]]],METHOD["Vertical Offset",ID["EPSG",9616]],PARAMETER["Vertical Offset",-0.146,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",8603]],OPERATIONACCURACY[0],ID["EPSG",7977]]],ID["EPSG",7983]]


