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",ENSEMBLE["European Terrestrial Reference System 1989 ensemble",MEMBER["European Terrestrial Reference Frame 1989"],MEMBER["European Terrestrial Reference Frame 1990"],MEMBER["European Terrestrial Reference Frame 1991"],MEMBER["European Terrestrial Reference Frame 1992"],MEMBER["European Terrestrial Reference Frame 1993"],MEMBER["European Terrestrial Reference Frame 1994"],MEMBER["European Terrestrial Reference Frame 1996"],MEMBER["European Terrestrial Reference Frame 1997"],MEMBER["European Terrestrial Reference Frame 2000"],MEMBER["European Terrestrial Reference Frame 2005"],MEMBER["European Terrestrial Reference Frame 2014"],MEMBER["European Terrestrial Reference Frame 2020"],MEMBER["ETRS89-DNK"],MEMBER["Estonia 1997"],MEMBER["Albanian Geodetic Reference Frame 2008"],MEMBER["Albanian Geodetic Reference Frame 2014"],MEMBER["ETRS89-AUT [2002]"],MEMBER["Belgian Reference Frame 2002"],MEMBER["Belgian Reference Frame 2011"],MEMBER["BH_ETRS89"],MEMBER["Bulgaria Geodetic System 2005"],MEMBER["Croatian Terrestrial Reference System 1996"],MEMBER["AGRS2010 (ETRF2000)"],MEMBER["CROPOS"],MEMBER["ETRF2000 Poland"],MEMBER["ETRS89/DREF91 Realization 2016"],MEMBER["ETRS89/DREF91 Realization 2025"],MEMBER["ETRS89-CZE [2007]"],MEMBER["ETRS89-ESP [REGENTE]"],MEMBER["ETRS89-ESP [ERGNSS]"],MEMBER["ETRS89-FRO [2008]"],MEMBER["Hellenic Terrestrial Reference System of 2007"],MEMBER["ETRS89-HUN [ETRF2000]"],MEMBER["ETRS89-IRE [ETRF2000]"],MEMBER["ETRS89-MKD [EUREF-MAK2010]"],MEMBER["EUREF89"],MEMBER["ETRS89-PRT [1995]"],MEMBER["ETRS89-ROU [ETRF2000]"],MEMBER["ETRS89-SVK [SKTRF09]"],MEMBER["ETRS89-SVK [SKTRF2022]"],MEMBER["EUREF-FIN"],MEMBER["Istituto Geografico Militare 1995"],MEMBER["Kosovo Reference System 2001"],MEMBER["Latvian geodetic coordinate system 1992"],MEMBER["Latvian coordinate system 2020"],MEMBER["Lithuania 1994 (ETRS89)"],MEMBER["MOLDREF99"],MEMBER["OSNet v2009"],MEMBER["Reseau Geodesique Francais 1993 v1"],MEMBER["Reseau Geodesique Francais 1993 v2"],MEMBER["Reseau Geodesique Francais 1993 v2b"],MEMBER["Rete Dinamica Nazionale 2008"],MEMBER["Serbian Reference Network 1998"],MEMBER["Serbian Spatial Reference System 2000"],MEMBER["Slovenia Geodetic Datum 1996"],MEMBER["SWEREF 99"],MEMBER["ETRS89-LUX [2020]"],MEMBER["Nordic Geodetic Commission ETRF14"],MEMBER["ETRS89-LUX [2025]"],MEMBER["Swiss Terrestrial Reference System 1995"],ELLIPSOID["GRS 1980",6378137,298.257222101,LENGTHUNIT["metre",1]],ENSEMBLEACCURACY[0.1]],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["Spatial referencing."],AREA["Europe - onshore and offshore: Albania; Andorra; Austria; Belgium; Bosnia and Herzegovina; Bulgaria; Croatia; Czechia; Denmark; Estonia; Faroe Islands; Finland; France; Germany; Gibraltar; Greece; Hungary; Ireland; Italy; Kosovo; Latvia; Liechtenstein; Lithuania; Luxembourg; Malta; Moldova; Monaco; Montenegro; Netherlands; North Macedonia; Norway including Svalbard and Jan Mayen; Poland; Portugal - mainland; Romania; San Marino; Serbia; Slovakia; Slovenia; Spain - mainland and Balearic islands; Sweden; Switzerland; United Kingdom (UK) including Channel Islands and Isle of Man; Vatican City State."],BBOX[33.26,-16.1,84.73,38]],ID["EPSG",4258],REMARK["Has been realized through ETRF89, ETRF90, ETRF91, ETRF92, ETRF93, ETRF94, ETRF96, ETRF97, ETRF2000, ETRF2005 and ETRF2014. This 'ensemble' covers any or all of these realizations without distinction."]]],ABRIDGEDTRANSFORMATION["OSGB36 to ETRS89 (1)",METHOD["NTv2",ID["EPSG",9615]],PARAMETERFILE["Latitude and longitude difference file","OSTN02_NTv2.gsb"],USAGE[SCOPE["Transformation of coordinates at 0.03m level of accuracy."],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",5338],REMARK["Approximate alternative to official OSTN02 method (tfm code 7952). Accuracy at 2000 test points compared to OSTN02 (tfm code 1039): latitude 0.5mm av, 17mm max; longitude 0.8mm av, 23mm max. May be taken as approximate CT to WGS 84 - see code 5339."]]]