Well Known Text

CONCATENATEDOPERATION["Cascais height to ZH Portugal depth (2)",SOURCECRS[VERTCRS["Cascais height",VDATUM["Cascais",ID["EPSG",5178]],CS[vertical,1,ID["EPSG",6499]],AXIS["Gravity-related height (H)",up],LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",5780]]],TARGETCRS[VERTCRS["ZH Portugal depth",VDATUM["Chart Datum Portugal ",ID["EPSG",1361]],CS[vertical,1,ID["EPSG",6498]],AXIS["Depth (D)",down],LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",10349]]],STEP[CONVERSION["Height <> Depth Conversion",METHOD["Height Depth Reversal",ID["EPSG",1068]],ID["EPSG",7812]]],STEP[COORDINATEOPERATION["Cascais depth to ZH Portugal depth (2)",VERSION["IH-Por Tagus"],SOURCECRS[VERTCRS["Cascais depth",BASEVERTCRS["Cascais height",VDATUM["Cascais",ID["EPSG",5178]],ID["EPSG",5780]],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",10364]]],TARGETCRS[VERTCRS["ZH Portugal depth",VDATUM["Chart Datum Portugal ",ID["EPSG",1361]],CS[vertical,1,ID["EPSG",6498]],AXIS["Depth (D)",down],LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",10349]]],METHOD["Vertical Offset",ID["EPSG",9616]],PARAMETER["Vertical Offset",-2.08,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",8603]],OPERATIONACCURACY[0],ID["EPSG",10381]]],ID["EPSG",10393]]