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["ETRS89-GBR [OSNet v2009]",DATUM["OSNet v2009",ELLIPSOID["GRS 1980",6378137,298.257222101,LENGTHUNIT["metre",1]],ANCHOREPOCH[2009.756]],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["United Kingdom (UK) - Great Britain - England and Wales onshore, Scotland onshore and Western Isles nearshore including Sea of the Hebrides and The Minch; Isle of Man onshore."],BBOX[49.79,-8.82,60.94,1.92]],ID["EPSG",11009],REMARK["Horizontal component of second national realization of ETRS89 in Great Britain. Replaces ETRS89-GBR [OSNet v2001] from 2016."]]],ABRIDGEDTRANSFORMATION["OSGB36 to ETRS89-GBR [OSNet v2009] (2)",METHOD["NTv2",ID["EPSG",9615]],PARAMETERFILE["Latitude and longitude difference file","OSTN15_NTv2_OSGBtoETRS.gsb"],USAGE[SCOPE["Transformation of coordinates at 0.03m level of accuracy."],AREA["United Kingdom (UK) - Great Britain - England and Wales onshore, Scotland onshore and Western Isles nearshore including Sea of the Hebrides and The Minch; Isle of Man onshore."],BBOX[49.79,-8.82,60.94,1.92]],ID["EPSG",11509],REMARK["Approximate alternative to official OSTN15 method (tfm code 7953). May be taken as approximate transformation OSGB36 to WGS 84 - see code 7710. Replaces OSGB36 to ETRS89 (1) (tfm code 5338)."]]]