Well Known Text

CONCATENATEDOPERATION["Cais da Madalena height to ZH Portugal depth (1)",SOURCECRS[VERTCRS["Cais da Madalena height",VDATUM["Cais da Madalena",ID["EPSG",1105]],CS[vertical,1,ID["EPSG",6499]],AXIS["Gravity-related height (H)",up],LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",6182]]],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["Cais da Madalena depth to ZH Portugal depth (1)",VERSION["IH-Por Pico"],SOURCECRS[VERTCRS["Cais da Madalena depth",BASEVERTCRS["Cais da Madalena height",VDATUM["Cais da Madalena",ID["EPSG",1105]],ID["EPSG",6182]],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",10374]]],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",-1,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",8603]],OPERATIONACCURACY[0],ID["EPSG",10386]]],ID["EPSG",10398]]