BOUNDCRS[SOURCECRS[PROJCRS["OSGB36 / Heathrow Airport GIS Grid 2026",BASEGEOGCRS["OSGB36",DATUM["Ordnance Survey of Great Britain 1936",ELLIPSOID["Airy 1830",6377563.396,299.3249646,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],ID["EPSG",4277]],CONVERSION["Heathrow Airport GIS Grid 2026",METHOD["Local Orthographic",ID["EPSG",1130]],PARAMETER["Latitude of projection centre",51.4701102238889,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8811]],PARAMETER["Longitude of projection centre",-0.451656585555556,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8812]],PARAMETER["Azimuth at projection centre",359.700932272222,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8813]],PARAMETER["Scale factor at projection centre",1.000002816,SCALEUNIT["unity",1],ID["EPSG",8815]],PARAMETER["Easting at projection centre",7334.818,LENGTHUNIT["metre",1],ID["EPSG",8816]],PARAMETER["Northing at projection centre",5637.421,LENGTHUNIT["metre",1],ID["EPSG",8817]]],CS[Cartesian,2],AXIS["(E)",east,ORDER[1],LENGTHUNIT["metre",1]],AXIS["(N)",north,ORDER[2],LENGTHUNIT["metre",1]],USAGE[SCOPE["GIS."],AREA["UK - Heathrow airport and surrounding area."],BBOX[51.42,-0.56,51.52,-0.37]],ID["EPSG",11390]]],TARGETCRS[GEOGCRS["WGS 84",ENSEMBLE["World Geodetic System 1984 ensemble",MEMBER["World Geodetic System 1984 (Transit)"],MEMBER["World Geodetic System 1984 (G730)"],MEMBER["World Geodetic System 1984 (G873)"],MEMBER["World Geodetic System 1984 (G1150)"],MEMBER["World Geodetic System 1984 (G1674)"],MEMBER["World Geodetic System 1984 (G1762)"],MEMBER["World Geodetic System 1984 (G2139)"],MEMBER["World Geodetic System 1984 (G2296)"],ELLIPSOID["WGS 84",6378137,298.257223563,LENGTHUNIT["metre",1]],ENSEMBLEACCURACY[2.0]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],CS[ellipsoidal,2],AXIS["geodetic latitude (Lat)",north,ORDER[1],ANGLEUNIT["degree",0.0174532925199433]],AXIS["geodetic longitude (Lon)",east,ORDER[2],ANGLEUNIT["degree",0.0174532925199433]],USAGE[SCOPE["Horizontal component of 3D system."],AREA["World."],BBOX[-90,-180,90,180]],ID["EPSG",4326]]],ABRIDGEDTRANSFORMATION["OSGB36 to WGS 84 (7)",METHOD["NTv2",ID["EPSG",9615]],PARAMETERFILE["Latitude and longitude difference file","OSTN02_NTv2.gsb"],USAGE[SCOPE["(null/copy) Approximation for medium and low accuracy applications assuming equality between plate-fixed static and earth-fixed dynamic CRSs, ignoring static/dynamic CRS differences."],AREA["United Kingdom (UK) - Great Britain - England, Scotland and Wales onshore; Isle of Man onshore."],BBOX[49.81,-8.69,60.93,1.91]],ID["EPSG",5339],REMARK["Parameter values taken from OSGB36 to ETRS89 (1) (tfm code 5338) assuming that ETRS89 is coincident with WGS 84 within the accuracy of the tfm."]]]