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Geodetic CRS: NTF
Datum: Nouvelle Triangulation Francaise
Ellipsoid: Clarke 1880 (IGN)
Prime meridian: Greenwich
Data source: EPSG
Information source: Institut Geographique National (IGN) document NTG_88.pdf, "Grille de parametres de transformation de coordonnees". http://www.ign.fr
Revision date: 2022-01-24
Scope: Transformation of coordinates at 1m level of accuracy.
Remarks: Parameter file is from NTF to RGF93 v1 (code 9327), assuming that RGF93 v1 is equivalent to RGF93 v2b within the accuracy of the transformation. May be emulated using NTv2 method - see CT code 9891.
Method: Geocentric translation by Grid Interpolation (IGN)
Area of use: France - onshore - mainland and Corsica.
Description: (0,)
Definition: OGC Well Known Text 2 (2019)
COORDINATEOPERATION["NTF to RGF93 v2b (1)", VERSION["IGN-Fra 1m"], SOURCECRS[ GEOGCRS["NTF", DATUM["Nouvelle Triangulation Francaise", ELLIPSOID["Clarke 1880 (IGN)",6378249.2,293.466021293627, 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",4275]]], TARGETCRS[ GEOGCRS["RGF93 v2b", DATUM["Reseau Geodesique Francais 1993 v2b", ELLIPSOID["GRS 1980",6378137,298.257222101, 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",9782]]], METHOD["Geocentric translation by Grid Interpolation (IGN)", ID["EPSG",1087]], PARAMETERFILE["Geocentric translation file","gr3df97a.txt"], INTERPOLATIONCRS[ GEOGCRS["RGF93 v2b", DATUM["Reseau Geodesique Francais 1993 v2b", ELLIPSOID["GRS 1980",6378137,298.257222101, 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]]]], OPERATIONACCURACY[1.0], USAGE[ SCOPE["Transformation of coordinates at 1m level of accuracy."], AREA["France - onshore - mainland and Corsica."], BBOX[41.31,-4.87,51.14,9.63]], ID["EPSG",9889], REMARK["Parameter file is from NTF to RGF93 v1 (code 9327), assuming that RGF93 v1 is equivalent to RGF93 v2b within the accuracy of the transformation. May be emulated using NTv2 method - see CT code 9891."]]
Definition: PROJ.4
+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=push +v_3 +step +proj=cart +ellps=clrk80ign +step +proj=xyzgridshift +grids=fr_ign_gr3df97a.tif +grid_ref=output_crs +ellps=GRS80 +step +inv +proj=cart +ellps=GRS80 +step +proj=pop +v_3 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1
Definition: JavaScript (Proj4js)
proj4.defs("EPSG:9889","+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=push +v_3 +step +proj=cart +ellps=clrk80ign +step +proj=xyzgridshift +grids=fr_ign_gr3df97a.tif +grid_ref=output_crs +ellps=GRS80 +step +inv +proj=cart +ellps=GRS80 +step +proj=pop +v_3 +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": "NTF to RGF93 v2b (1)", "source_crs": { "type": "GeographicCRS", "name": "NTF", "datum": { "type": "GeodeticReferenceFrame", "name": "Nouvelle Triangulation Francaise", "ellipsoid": { "name": "Clarke 1880 (IGN)", "semi_major_axis": 6378249.2, "semi_minor_axis": 6356515 } }, "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": 4275 } }, "target_crs": { "type": "GeographicCRS", "name": "RGF93 v2b", "datum": { "type": "GeodeticReferenceFrame", "name": "Reseau Geodesique Francais 1993 v2b", "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": 9782 } }, "interpolation_crs": { "type": "GeographicCRS", "name": "RGF93 v2b", "datum": { "type": "GeodeticReferenceFrame", "name": "Reseau Geodesique Francais 1993 v2b", "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": 9782 } }, "method": { "name": "Geocentric translation by Grid Interpolation (IGN)", "id": { "authority": "EPSG", "code": 1087 } }, "parameters": [ { "name": "Geocentric translation file", "value": "gr3df97a.txt", "id": { "authority": "EPSG", "code": 8727 } } ], "accuracy": "1.0", "scope": "Transformation of coordinates at 1m level of accuracy.", "area": "France - onshore - mainland and Corsica.", "bbox": { "south_latitude": 41.31, "west_longitude": -4.87, "north_latitude": 51.14, "east_longitude": 9.63 }, "id": { "authority": "EPSG", "code": 9889 }, "remarks": "Parameter file is from NTF to RGF93 v1 (code 9327), assuming that RGF93 v1 is equivalent to RGF93 v2b within the accuracy of the transformation. May be emulated using NTv2 method - see CT code 9891." }
Definition: MapServer - MAPfile
PROJECTION "proj=pipeline" "step" "proj=axisswap" "order=2,1" "step" "proj=unitconvert" "xy_in=deg" "xy_out=rad" "step" "proj=push" "v_3" "step" "proj=cart" "ellps=clrk80ign" "step" "proj=xyzgridshift" "grids=fr_ign_gr3df97a.tif" "grid_ref=output_crs" "ellps=GRS80" "step" "inv" "proj=cart" "ellps=GRS80" "step" "proj=pop" "v_3" "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=push +v_3 +step +proj=cart +ellps=clrk80ign +step +proj=xyzgridshift +grids=fr_ign_gr3df97a.tif +grid_ref=output_crs +ellps=GRS80 +step +inv +proj=cart +ellps=GRS80 +step +proj=pop +v_3 +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=push +v_3 +step +proj=cart +ellps=clrk80ign +step +proj=xyzgridshift +grids=fr_ign_gr3df97a.tif +grid_ref=output_crs +ellps=GRS80 +step +inv +proj=cart +ellps=GRS80 +step +proj=pop +v_3 +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 ( 9889, 'EPSG', 9889, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=push +v_3 +step +proj=cart +ellps=clrk80ign +step +proj=xyzgridshift +grids=fr_ign_gr3df97a.tif +grid_ref=output_crs +ellps=GRS80 +step +inv +proj=cart +ellps=GRS80 +step +proj=pop +v_3 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1', 'None');
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