Well Known Text
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WKT Version 2

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]]