Geodetic CRS: CH1903
Datum: CH1903
Ellipsoid: Bessel 1841
Prime meridian: Greenwich
Data source: EPSG
Information source: Bundesamt für Landestopografie swisstopo; https://www.swisstopo.ch
Revision date: 2026-02-10
Scope: Approximation (to better than 2cm) using NTv2 method of results of FINELTRA programme concatenated with LV-95 parameters.
Remarks: Equivalent to concatenation of CTs 15486 (CH1903 to CH1903+) and 1647 (CH1903+ to ETRS89-CHE [CHTRF95]). Approximates official FINELTRA application to within 2cm. Also documented as CT between CH1903 and CHTRS95 (see code 7673). Replaces CT code 1646. May be used as approximate CT CH1903 to WGS 84, see code 7788.
Method: NTv2
Area of use: Liechtenstein; Switzerland.
Description: (0,)
Definition: OGC Well Known Text 2 (2019)
COORDINATEOPERATION["CH1903 to ETRS89-CHE [CHTRF95] (2)", VERSION["BfL-Che NTv2"], SOURCECRS[ GEOGCRS["CH1903", DATUM["CH1903", ELLIPSOID["Bessel 1841",6377397.155,299.1528128, LENGTHUNIT["metre",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]], ID["EPSG",4149]]], TARGETCRS[ GEOGCRS["ETRS89-CHE [CHTRF95]", DATUM["Swiss Terrestrial Reference Frame 1995", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]], ANCHOREPOCH[1993]], 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]], ID["EPSG",11307]]], METHOD["NTv2", ID["EPSG",9615]], PARAMETERFILE["Latitude and longitude difference file","CHENyx06_ETRS.gsb"], OPERATIONACCURACY[0.25], USAGE[ SCOPE["Approximation (to better than 2cm) using NTv2 method of results of FINELTRA programme concatenated with LV-95 parameters."], AREA["Liechtenstein; Switzerland."], BBOX[45.81,5.95,47.81,10.5]], ID["EPSG",7674], REMARK["Equivalent to concatenation of CTs 15486 (CH1903 to CH1903+) and 1647 (CH1903+ to ETRS89-CHE [CHTRF95]). Approximates official FINELTRA application to within 2cm. Also documented as CT between CH1903 and CHTRS95 (see code 7673). Replaces CT code 1646. May be used as approximate CT CH1903 to WGS 84, see code 7788."]]
Definition: JavaScript (Proj4js)
proj4.defs("EPSG:7674","+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=ch_swisstopo_CHENyx06_ETRS.tif +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": "CH1903 to ETRS89-CHE [CHTRF95] (2)", "source_crs": { "type": "GeographicCRS", "name": "CH1903", "datum": { "type": "GeodeticReferenceFrame", "name": "CH1903", "ellipsoid": { "name": "Bessel 1841", "semi_major_axis": 6377397.155, "inverse_flattening": 299.1528128 } }, "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": 4149 }, "remarks": "Replaced by CH1903+." }, "target_crs": { "type": "GeographicCRS", "name": "ETRS89-CHE [CHTRF95]", "datum": { "type": "GeodeticReferenceFrame", "name": "Swiss Terrestrial Reference Frame 1995", "anchor_epoch": 1993, "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": 11307 }, "remarks": "First realization of CHTRS95. For CRS used for topographic and cadastral purposes see CH1903+ (CRS code 4150)." }, "method": { "name": "NTv2", "id": { "authority": "EPSG", "code": 9615 } }, "parameters": [ { "name": "Latitude and longitude difference file", "value": "CHENyx06_ETRS.gsb", "id": { "authority": "EPSG", "code": 8656 } } ], "accuracy": "0.25", "scope": "Approximation (to better than 2cm) using NTv2 method of results of FINELTRA programme concatenated with LV-95 parameters.", "area": "Liechtenstein; Switzerland.", "bbox": { "south_latitude": 45.81, "west_longitude": 5.95, "north_latitude": 47.81, "east_longitude": 10.5 }, "id": { "authority": "EPSG", "code": 7674 }, "remarks": "Equivalent to concatenation of CTs 15486 (CH1903 to CH1903+) and 1647 (CH1903+ to ETRS89-CHE [CHTRF95]). Approximates official FINELTRA application to within 2cm. Also documented as CT between CH1903 and CHTRS95 (see code 7673). Replaces CT code 1646. May be used as approximate CT CH1903 to WGS 84, see code 7788." }
Definition: MapServer - MAPfile
PROJECTION "proj=pipeline" "step" "proj=axisswap" "order=2,1" "step" "proj=unitconvert" "xy_in=deg" "xy_out=rad" "step" "proj=hgridshift" "grids=ch_swisstopo_CHENyx06_ETRS.tif" "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 +proj=hgridshift +grids=ch_swisstopo_CHENyx06_ETRS.tif +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 +proj=hgridshift +grids=ch_swisstopo_CHENyx06_ETRS.tif +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 ( 7674, 'EPSG', 7674, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=ch_swisstopo_CHENyx06_ETRS.tif +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1', 'None');