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Geodetic CRS: ETRS89-GBR [OSNet v2009]
Datum: OSNet v2009
Ellipsoid: GRS 1980
Prime meridian: Greenwich
Data source: EPSG
Information source: Transport for London, Topographic surveys and mapping Standard S1026, issue A4, May 2025.
Revision date: 2025-10-17
Scope: Reversible geoid model transformation.
Remarks: Reversible alternative to ETRS89-GBR [OSNet v2009] to LSG height (1) (code 10990). File LSGGM2025_W.grd covers areas west of the Greenwich meridian, with complimentary file LSGGM2025_E.grd covering east of the meridian. The full grid is available in a single file in each of Leica, Topcon and Trimble formats.
Method: Geog3D to Geog2D+GravityRelatedHeight (EGM)
Area of use: United Kingdom (UK) - Greater London and surrounding area.
Description: (0,)
Definition: OGC Well Known Text 2 (2019)
COORDINATEOPERATION["ETRS89-GBR [OSNet v2009] to ETRS89-GBR [OSNet v2009] + LSG height (1)", VERSION["TfL-Gbr LSGGM2025"], SOURCECRS[ 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,3], AXIS["geodetic latitude (Lat)",north, ORDER[1], ANGLEUNIT["degree",0.0174532925199433]], AXIS["geodetic longitude (Lon)",east, ORDER[2], ANGLEUNIT["degree",0.0174532925199433]], AXIS["ellipsoidal height (h)",up, ORDER[3], LENGTHUNIT["metre",1]], ID["EPSG",11008]]], TARGETCRS[ COMPOUNDCRS["ETRS89-GBR [OSNet v2009] + London Survey Grid height", 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]]], VERTCRS["London Survey Grid height", VDATUM["London Survey Grid height datum"], CS[vertical,1], AXIS["gravity-related height (H)",up, LENGTHUNIT["metre",1]]], ID["EPSG",10997]]], METHOD["Geog3D to Geog2D+GravityRelatedHeight (EGM)", ID["EPSG",1103]], PARAMETERFILE["Geoid (height correction) model file","LSGGM2025.grd"], INTERPOLATIONCRS[ 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]]]], OPERATIONACCURACY[0.0], USAGE[ SCOPE["Reversible geoid model transformation."], AREA["United Kingdom (UK) - Greater London and surrounding area."], BBOX[51.1,-1.33,52,0.8]], ID["EPSG",10998], REMARK["Reversible alternative to ETRS89-GBR [OSNet v2009] to LSG height (1) (code 10990). File LSGGM2025_W.grd covers areas west of the Greenwich meridian, with complimentary file LSGGM2025_E.grd covering east of the meridian. The full grid is available in a single file in each of Leica, Topcon and Trimble formats."]]
Definition: JavaScript (Proj4js)
proj4.defs("EPSG:10998","+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +inv +proj=vgridshift +grids=LSGGM2025.grd +multiplier=1 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1");
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "Transformation", "name": "ETRS89-GBR [OSNet v2009] to ETRS89-GBR [OSNet v2009] + LSG height (1)", "source_crs": { "type": "GeographicCRS", "name": "ETRS89-GBR [OSNet v2009]", "datum": { "type": "GeodeticReferenceFrame", "name": "OSNet v2009", "anchor_epoch": 2009.756, "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 } }, "coordinate_system": { "subtype": "ellipsoidal", "axis": [ { "name": "Geodetic latitude", "abbreviation": "Lat", "direction": "north", "unit": "degree" }, { "name": "Geodetic longitude", "abbreviation": "Lon", "direction": "east", "unit": "degree" }, { "name": "Ellipsoidal height", "abbreviation": "h", "direction": "up", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 11008 }, "remarks": "Second national realization of ETRS89 in Great Britain. Replaces ETRS89-GBR [OSNet v2001] from 2016." }, "target_crs": { "type": "CompoundCRS", "name": "ETRS89-GBR [OSNet v2009] + London Survey Grid height", "components": [ { "type": "GeographicCRS", "name": "ETRS89-GBR [OSNet v2009]", "datum": { "type": "GeodeticReferenceFrame", "name": "OSNet v2009", "anchor_epoch": 2009.756, "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 } }, "coordinate_system": { "subtype": "ellipsoidal", "axis": [ { "name": "Geodetic latitude", "abbreviation": "Lat", "direction": "north", "unit": "degree" }, { "name": "Geodetic longitude", "abbreviation": "Lon", "direction": "east", "unit": "degree" } ] }, "remarks": "Horizontal component of second national realization of ETRS89 in Great Britain. Replaces ETRS89-GBR [OSNet v2001] from 2016." }, { "type": "VerticalCRS", "name": "London Survey Grid height", "datum": { "type": "VerticalReferenceFrame", "name": "London Survey Grid height datum" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Gravity-related height", "abbreviation": "H", "direction": "up", "unit": "metre" } ] } } ], "id": { "authority": "EPSG", "code": 10997 } }, "interpolation_crs": { "type": "GeographicCRS", "name": "ETRS89-GBR [OSNet v2009]", "datum": { "type": "GeodeticReferenceFrame", "name": "OSNet v2009", "anchor_epoch": 2009.756, "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 } }, "coordinate_system": { "subtype": "ellipsoidal", "axis": [ { "name": "Geodetic latitude", "abbreviation": "Lat", "direction": "north", "unit": "degree" }, { "name": "Geodetic longitude", "abbreviation": "Lon", "direction": "east", "unit": "degree" } ] }, "id": { "authority": "EPSG", "code": 11009 }, "remarks": "Horizontal component of second national realization of ETRS89 in Great Britain. Replaces ETRS89-GBR [OSNet v2001] from 2016." }, "method": { "name": "Geog3D to Geog2D+GravityRelatedHeight (EGM)", "id": { "authority": "EPSG", "code": 1103 } }, "parameters": [ { "name": "Geoid (height correction) model file", "value": "LSGGM2025.grd", "id": { "authority": "EPSG", "code": 8666 } } ], "accuracy": "0.0", "scope": "Reversible geoid model transformation.", "area": "United Kingdom (UK) - Greater London and surrounding area.", "bbox": { "south_latitude": 51.1, "west_longitude": -1.33, "north_latitude": 52, "east_longitude": 0.8 }, "id": { "authority": "EPSG", "code": 10998 }, "remarks": "Reversible alternative to ETRS89-GBR [OSNet v2009] to LSG height (1) (code 10990). File LSGGM2025_W.grd covers areas west of the Greenwich meridian, with complimentary file LSGGM2025_E.grd covering east of the meridian. The full grid is available in a single file in each of Leica, Topcon and Trimble formats." }
Definition: MapServer - MAPfile
PROJECTION "proj=pipeline" "step" "proj=axisswap" "order=2,1" "step" "proj=unitconvert" "xy_in=deg" "xy_out=rad" "step" "inv" "proj=vgridshift" "grids=LSGGM2025.grd" "multiplier=1" "step" "proj=unitconvert" "xy_in=rad" "xy_out=deg" "step" "proj=axisswap" "order=2,1" END
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +inv +proj=vgridshift +grids=LSGGM2025.grd +multiplier=1 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1"> <Layer srs="+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +inv +proj=vgridshift +grids=LSGGM2025.grd +multiplier=1 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1"> </Layer> </Map>
Definition: SQL (PostGIS)
INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 10998, 'EPSG', 10998, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +inv +proj=vgridshift +grids=LSGGM2025.grd +multiplier=1 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1', 'None');
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