Well Known Text
 
WKT Version 2
COORDINATEOPERATION["NAD83 to NAD83(HARN) (27)",VERSION["NGS-Usa VA"],SOURCECRS[GEOGCRS["NAD83",DATUM["North American Datum 1983",ELLIPSOID["GRS 1980",6378137,298.257222101,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",7019]],ID["EPSG",6269]],CS[ellipsoidal,2,ID["EPSG",6422]],AXIS["Geodetic latitude (Lat)",north],AXIS["Geodetic longitude (Lon)",east],ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],ID["EPSG",4269]]],TARGETCRS[GEOGCRS["NAD83(HARN)",DATUM["NAD83 (High Accuracy Reference Network)",ELLIPSOID["GRS 1980",6378137,298.257222101,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",7019]],ID["EPSG",6152]],CS[ellipsoidal,2,ID["EPSG",6422]],AXIS["Geodetic latitude (Lat)",north],AXIS["Geodetic longitude (Lon)",east],ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],ID["EPSG",4152]]],METHOD["NADCON",ID["EPSG",9613]],PARAMETERFILE["Latitude difference file","vahpgn.las",ID["EPSG",8657]],PARAMETERFILE["Longitude difference file","vahpgn.los",ID["EPSG",8658]],OPERATIONACCURACY[0.05],ID["EPSG",1500]]