Well Known Text
WKT Version 2
COMPOUNDCRS["OSGB36 / British National Grid + BI height",PROJCRS["OSGB36 / British National Grid",BASEGEOGCRS["OSGB36",DATUM["Ordnance Survey of Great Britain 1936",ELLIPSOID["Airy 1830",6377563.396,299.3249646,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",7001]],ID["EPSG",6277]],ID["EPSG",4277]],CONVERSION["British National Grid",METHOD["Transverse Mercator",ID["EPSG",9807]],PARAMETER["Latitude of natural origin",49,ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],ID["EPSG",8801]],PARAMETER["Longitude of natural origin",-2,ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],ID["EPSG",8802]],PARAMETER["Scale factor at natural origin",0.9996012717,SCALEUNIT["unity",1,ID["EPSG",9201]],ID["EPSG",8805]],PARAMETER["False easting",400000,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",8806]],PARAMETER["False northing",-100000,LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",8807]],ID["EPSG",19916]],CS[Cartesian,2,ID["EPSG",4400]],AXIS["Easting (E)",east],AXIS["Northing (N)",north],LENGTHUNIT["metre",1,ID["EPSG",9001]],ID["EPSG",27700]],VERTCRS["BI height",ENSEMBLE["British Isles height ensemble",MEMBER["Malin Head",ID["EPSG",5130]],MEMBER["Belfast Lough",ID["EPSG",5131]],MEMBER["Ordnance Datum Newlyn",ID["EPSG",5101]],MEMBER["Ordnance Datum Newlyn (Offshore)",ID["EPSG",1164]],MEMBER["Ordnance Datum Newlyn (Orkney Isles)",ID["EPSG",5138]],MEMBER["Lerwick",ID["EPSG",5140]],MEMBER["Stornoway",ID["EPSG",5144]],MEMBER["Douglas",ID["EPSG",5148]],MEMBER["St. Marys",ID["EPSG",5147]],ENSEMBLEACCURACY[0.4],ID["EPSG",1288]],CS[vertical,1,ID["EPSG",6499]],AXIS["Gravity-related height (H)",up],LENGTHUNIT["metre",1,ID["EPSG",9001]],GEOIDMODEL["ETRS89 to BI height (1)",ID["EPSG",9914]],GEOIDMODEL["ETRS89 to BI height (2)",ID["EPSG",9916]],GEOIDMODEL["ETRS89 to BI height (3)",ID["EPSG",9918]],ID["EPSG",9451]],ID["EPSG",9920]]