Well Known Text
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WKT Version 2

COORDINATEOPERATION["NZVD2009 height to Stewart Island 1977 height (1)",VERSION["LINZ-NZ STIS"],SOURCECRS[VERTCRS["NZVD2009 height",VDATUM["New Zealand Vertical Datum 2009",ID["EPSG",1039]],CS[vertical,1,ID["EPSG",6499]],AXIS["Gravity-related height (H)",up],LENGTHUNIT["metre",1,ID["EPSG",9001]],GEOIDMODEL["NZGD2000 to NZVD2009 height (2)",ID["EPSG",9325]],ID["EPSG",4440]]],TARGETCRS[VERTCRS["Stewart Island 1977 height",VDATUM["Stewart Island 1977",ID["EPSG",5170]],CS[vertical,1,ID["EPSG",6499]],AXIS["Gravity-related height (H)",up],LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",5772]]],METHOD["Vertical Offset",ID["EPSG",9616]],PARAMETER["Vertical Offset",0.39,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",8603]],OPERATIONACCURACY[0.15],ID["EPSG",4452]]