Well Known Text
 
WKT Version 2
COORDINATEOPERATION["BGS2005 height to EVRF2019 height (1)",VERSION["EuG-Bgr 2019z 2020-09"],SOURCECRS[VERTCRS["BGS2005 height",VDATUM["Bulgarian Height System 2005",ID["EPSG",1300]],CS[vertical,1,ID["EPSG",6499]],AXIS["Gravity-related height (H)",up],LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",9669]]],TARGETCRS[VERTCRS["EVRF2019 height",VDATUM["European Vertical Reference Frame 2019",ID["EPSG",1274]],CS[vertical,1,ID["EPSG",6499]],AXIS["Gravity-related height (H)",up],LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",9389]]],METHOD["Vertical Offset by Grid Interpolation (asc)",ID["EPSG",1085]],PARAMETERFILE["Vertical offset file","bgneu_2019z.asc",ID["EPSG",8732]],PARAMETER["EPSG code for Interpolation CRS",4258,ID["EPSG",1048]],OPERATIONACCURACY[0.036],ID["EPSG",9670]]