Well Known Text
 
WKT Version 2
COORDINATEOPERATION["SHGD2015 to SHVD2015 height (1)",VERSION["ENRD-Shn Hel"],SOURCECRS[GEOGCRS["SHGD2015",DATUM["St. Helena Geodetic Datum 2015",ELLIPSOID["GRS 1980",6378137,298.257222101,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",7019]],ID["EPSG",1174]],CS[ellipsoidal,3,ID["EPSG",6423]],AXIS["Geodetic latitude (Lat)",north,ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]]],AXIS["Geodetic longitude (Lon)",east,ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]]],AXIS["Ellipsoidal height (h)",up,LENGTHUNIT["metre",1,ID["EPSG",9001]]],ID["EPSG",7885]]],TARGETCRS[VERTCRS["SHVD2015 height",VDATUM["St. Helena Vertical Datum 2015",ID["EPSG",1177]],CS[vertical,1,ID["EPSG",6499]],AXIS["Gravity-related height (H)",up],LENGTHUNIT["metre",1,ID["EPSG",9001]],GEOIDMODEL["SHGD2015 to SHVD2015 height (1)",ID["EPSG",7891]],ID["EPSG",7890]]],METHOD["Geographic3D to GravityRelatedHeight (EGM2008)",ID["EPSG",1025]],PARAMETERFILE["Geoid (height correction) model file","Und_min2.5x2.5_egm2008_isw=82_WGS84_TideFree.gz",ID["EPSG",8666]],OPERATIONACCURACY[0],ID["EPSG",7891]]