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Geodetic CRS: ETRS89
Datum: European Terrestrial Reference System 1989 ensemble
Data source: EPSG
Information source: National Geographic Institute, Belgium.
Revision date: 2022-02-03
Scope: Derivation of gravity-related heights from GNSS observations.
Remarks: Based on gravimetric quasi-geoid NLGEO2018 fitted to 3707 benchmarks of the Ostend height leveling network. SD of 1 cm. In use from 2018-08-01. For reversible alternative to this transformation see ETRS89 to ETRS89 + Ostend height (1) (code 9909).
Method: Geographic3D to GravityRelatedHeight (txt)
Area of use: Belgium - onshore.
Description: (0,)
Definition: OGC Well Known Text 2 (2019)
COORDINATEOPERATION["ETRS89 to Ostend height (1)", VERSION["NGI-Bel 2018"], SOURCECRS[ 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"], ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]], ENSEMBLEACCURACY[0.1]], 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",4937]]], TARGETCRS[ VERTCRS["Ostend height", VDATUM["Ostend"], CS[vertical,1], AXIS["gravity-related height (H)",up, LENGTHUNIT["metre",1]], ID["EPSG",5710]]], METHOD["Geographic3D to GravityRelatedHeight (txt)", ID["EPSG",1082]], PARAMETERFILE["Geoid (height correction) model file","hBG18.dat"], OPERATIONACCURACY[0.02], USAGE[ SCOPE["Derivation of gravity-related heights from GNSS observations."], AREA["Belgium - onshore."], BBOX[49.5,2.5,51.51,6.4]], ID["EPSG",9908], REMARK["Based on gravimetric quasi-geoid NLGEO2018 fitted to 3707 benchmarks of the Ostend height leveling network. SD of 1 cm. In use from 2018-08-01. For reversible alternative to this transformation see ETRS89 to ETRS89 + Ostend height (1) (code 9909)."]]
Definition: JavaScript (Proj4js)
proj4.defs("EPSG:9908","+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +inv +proj=vgridshift +grids=be_ign_hBG18.tif +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 to Ostend height (1)", "source_crs": { "type": "GeographicCRS", "name": "ETRS89", "datum_ensemble": { "name": "European Terrestrial Reference System 1989 ensemble", "members": [ { "name": "European Terrestrial Reference Frame 1989", "id": { "authority": "EPSG", "code": 1178 } }, { "name": "European Terrestrial Reference Frame 1990", "id": { "authority": "EPSG", "code": 1179 } }, { "name": "European Terrestrial Reference Frame 1991", "id": { "authority": "EPSG", "code": 1180 } }, { "name": "European Terrestrial Reference Frame 1992", "id": { "authority": "EPSG", "code": 1181 } }, { "name": "European Terrestrial Reference Frame 1993", "id": { "authority": "EPSG", "code": 1182 } }, { "name": "European Terrestrial Reference Frame 1994", "id": { "authority": "EPSG", "code": 1183 } }, { "name": "European Terrestrial Reference Frame 1996", "id": { "authority": "EPSG", "code": 1184 } }, { "name": "European Terrestrial Reference Frame 1997", "id": { "authority": "EPSG", "code": 1185 } }, { "name": "European Terrestrial Reference Frame 2000", "id": { "authority": "EPSG", "code": 1186 } }, { "name": "European Terrestrial Reference Frame 2005", "id": { "authority": "EPSG", "code": 1204 } }, { "name": "European Terrestrial Reference Frame 2014", "id": { "authority": "EPSG", "code": 1206 } } ], "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 }, "accuracy": "0.1", "id": { "authority": "EPSG", "code": 6258 } }, "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": 4937 } }, "target_crs": { "type": "VerticalCRS", "name": "Ostend height", "datum": { "type": "VerticalReferenceFrame", "name": "Ostend" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Gravity-related height", "abbreviation": "H", "direction": "up", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 5710 } }, "method": { "name": "Geographic3D to GravityRelatedHeight (txt)", "id": { "authority": "EPSG", "code": 1082 } }, "parameters": [ { "name": "Geoid (height correction) model file", "value": "hBG18.dat", "id": { "authority": "EPSG", "code": 8666 } } ], "accuracy": "0.02", "scope": "Derivation of gravity-related heights from GNSS observations.", "area": "Belgium - onshore.", "bbox": { "south_latitude": 49.5, "west_longitude": 2.5, "north_latitude": 51.51, "east_longitude": 6.4 }, "id": { "authority": "EPSG", "code": 9908 }, "remarks": "Based on gravimetric quasi-geoid NLGEO2018 fitted to 3707 benchmarks of the Ostend height leveling network. SD of 1 cm. In use from 2018-08-01. For reversible alternative to this transformation see ETRS89 to ETRS89 + Ostend height (1) (code 9909)." }
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=be_ign_hBG18.tif" "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=be_ign_hBG18.tif +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=be_ign_hBG18.tif +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 ( 9908, 'EPSG', 9908, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +inv +proj=vgridshift +grids=be_ign_hBG18.tif +multiplier=1 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1', 'None');
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