Coordinate Operations¶

Coordinate operations are used to convert coordinates from a source CRS to a target CRS.

If source and target CRSs are referred to a different datum, a datum transform has to be applied. Datum transforms are not exact, they are determined empirically. For the same pair of CRS, there can be many datum transforms and versions, each one with its own domain of validity and an associated transform error. Given a CRS pair, GeoServer will automatically pick the most accurate datum transform from the EPSG database, unless a custom operation is declared.

Coordinate operations can be queried and tested using the Reprojection Console.
To enable higher accuracy Grid Shift transforms, see Add Grid Shift Transform files.
See Define a custom Coordinate Operation to declare new operations. Custom operations will take precedence over the EPSG ones.

Reprojection Console¶

The reprojection console (available in Demos) lets you quickly test coordinate operations. Use it to convert a single coordinate or WKT geometry, and to see the operation details GeoServer is using. It is also useful to learn by example when you have to Define a custom Coordinate Operation.

Read more about the Reprojection console.

Add Grid Shift Transform files¶

GeoServer supports NTv2 and NADCON grid shift transforms. Grid files are not shipped out with GeoServer. They need to be downloaded, usually from your National Mapping Agency website.

Warning

Grid Shift files are only valid in the specific geographic domain for which they where made; trying to transform coordinates outside this domain will result in no trasformation at all. Make sure that the Grid Shift files are valid in the area you want to transform.

Search for the Grid File Name(s) int the tables below, which are extracted from EPSG version 11.0.31. If you need to use a Grid Shift transform not declared in EPSG, you will need to Define a custom Coordinate Operation.
Get the Grid File(s) from your National Mapping Agency (NTv2) or the US National Geodetic Survey (NADCON).
Copy the Grid File(s) in the user_projections directory inside your data directory.
Use the Reprojection Console to test the new transform.

List of available Grid Shift transforms¶

The list of Grid Shift transforms declared in EPSG version 11.0.31 is:

NTv2¶

Source CRS	Target CRS	Grid File Name	Source Info
3906	8685	MGI1901_TO_SRBETRS89_NTv2.gsb	Republic Geodetic Authority, Serbia; www.rgz.gov.rs
4122	4269	GS7783.GSB	Nova Scotia Geomatics Centre via ISO Geodetic Register.
4122	4326	NB7783v2.gsb	OGP
4122	4326	NS778301.gsb	OGP
4122	4326	PE7783V2.gsb	OGP
4122	8237	NB7783v2.gsb	New Brunswick Geographic Information Corporation land and water information standards manual.
4122	8237	PE7783V2.gsb	PEI Department of Transportation & Public Works
4122	8240	NS778301.gsb	Nova Scotia Geomatics Centre - Contact aflemmin@linux1.nsgc.gov.ns.ca or telephone 902-667-6409
4122	8252	NS778302.gsb	Nova Scotia Geomatics Centre via ISO Geodetic Register.
4149	4150	CHENyx06a.gsb	Bundesamt für Landestopografie swisstopo; www.swisstopo.ch
4149	4151	CHENyx06_ETRS.gsb	Bundesamt für Landestopografie swisstopo; www.swisstopo.ch
4149	4258	CHENyx06_ETRS.gsb	Bundesamt für Landestopografie swisstopo; www.swisstopo.ch
4149	4326	CHENyx06_ETRS.gsb	IOGP
4170	4674	SIRGAS1995-to-SIRGAS2000.gsb	SIRGAS Working Group I, “Relación y modelos de transformación entre las soluciones SIRGAS95, SIRGAS2000 y SIR17P01. Resultados obtenidos”, presented at SIMPOSIO SIRGAS 2021 Perú, 29 Nov-01 Dec 2021.
4171	4275	rgf93_ntf.gsb	ESRI
4202	4283	A66 National (13.09.01).gsb	GDA Technical Manual. http://www.icsm.gov.au/gda
4202	4283	SEAust_21_06_00.gsb	Office of Surveyor General Victoria; http://www.land.vic.gov.au/
4202	4283	nt_0599.gsb	GDA Technical Manual. http://www.icsm.gov.au/gda
4202	4283	tas_1098.gsb	http://www.delm.tas.gov.au/osg/Geodetic_transform.htm
4202	4283	vic_0799.gsb	Office of Surveyor General Victoria; http://www.land.vic.gov.au/
4202	4326	A66 National (13.09.01).gsb	OGP
4203	4283	National 84 (02.07.01).gsb	GDA Technical Manual. http://www.icsm.gov.au/gda
4203	4283	wa_0700.gsb	Department of Land Information, Government of Western Australia; http://www.dola.wa.gov.au/
4203	4326	National 84 (02.07.01).gsb	OGP
4207	4258	DLx_ETRS89_geo.gsb	Instituto Geografico Portugues; http://www.igeo.pt
4225	4326	CA7072_003.gsb	OGP
4225	4674	CA7072_003.gsb	IBGE.
4230	4258	100800401.gsb	Geodesy Unit, Cartographic Institute of Catalonia (ICC); http://www.icc.cat
4230	4258	BALR2009.gsb	National Geographic Institute of Spain (IGN), http://www.ign.es
4230	4258	PENR2009.gsb	National Geographic Institute of Spain (IGN), http://www.ign.es
4230	4258	SPED2ETV2.gsb	Instituto Geográfico Nacional, www.cnig.es
4230	4326	SPED2ETV2.gsb	OGP
4230	4670	35160622_47161840_E50_F89.gsb	Istituto Geografico Militare (IGM), www.igmi.org
4230	6706	35160622_47161840_E50_F00.gsb	Istituto Geografico Militare (IGM), www.igmi.org
4237	9067	hu_bme_hd72corr.gsb	Budapest University of Technology and Economics (BME) - Faculty of Civil Engineering. https://github.com/OSGeoLabBp/eov2etrs/blob/master/etrs2eov_doc.rst
4237	9067	hu_sgo_hd72corr.gsb	Lechner Knowledge Center, Satellite Geodesy Observatory (SGO), https://eht2.gnssnet.hu
4258	4275	rgf93_ntf.gsb	OGP
4258	9364	TN15-ETRS89-to-TPEN11-IRF.gsb	Network Rail.
4258	9372	TN15-ETRS89-to-MML07-IRF.gsb	Network Rail.
4258	9384	TN15-ETRS89-to-AbInvA96_2020-IRF.gsb	Transport Scotland.
4258	9453	TN15-ETRS89-to-GBK19-IRF.gsb	Network Rail.
4258	9739	TN15-ETRS89-to-EOS21-IRF.gsb	Network Rail.
4258	9758	TN15-ETRS89-to-ECML14_NB-IRF.gsb	Network Rail.
4258	9763	TN15-ETRS89-to-EWR2-IRF.gsb	Network Rail.
4258	9866	TN15-ETRS89-to-MRH21-IRF.gsb	Network Rail.
4258	9871	TN15-ETRS89-to-MOLDOR11-IRF.gsb	Network Rail.
4258	9939	TN15-ETRS89-to-EBBWV14-IRF.gsb	Network Rail.
4258	9964	TN15-ETRS89-to-HULLEE13-IRF.gsb	Network Rail.
4258	9969	TN15-ETRS89-to-SCM22-IRF.gsb	Network Rail.
4258	9974	TN15-ETRS89-to-FNL22-IRF.gsb	Network Rail.
4258	10158	s34j_2022.gsb	The Danish Agency for Data Supply and Infrastructure, https://sdfi.dk
4258	10175	TN15-ETRS89-to-DoPw22-IRF.gsb	Network Rail, UK.
4258	10185	TN15-ETRS89-to-ShAb07-IRF.gsb	Network Rail, UK.
4258	10191	TN15-ETRS89-to-CNH22-IRF.gsb	Network Rail.
4258	10196	TN15-ETRS89-to-CWS13-IRF.gsb	Network Rail.
4258	10204	TN15-ETRS89-to-DIBA15-IRF.gsb	Network Rail.
4258	10209	TN15-ETRS89-to-GWPBS22-IRF.gsb	Network Rail.
4258	10214	TN15-ETRS89-to-GWWAB22-IRF.gsb	Network Rail.
4258	10219	TN15-ETRS89-to-GWWWA22-IRF.gsb	Network Rail.
4258	10224	TN15-ETRS89-to-MALS09-IRF.gsb	Network Rail.
4258	10229	TN15-ETRS89-to-OxWo08-IRF.gsb	Network Rail.
4258	10237	TN15-ETRS89-to-SYC20-IRF.gsb	Network Rail.
4258	10249	s34s_2022.gsb	The Danish Agency for Data Supply and Infrastructure, https://sdfi.dk
4258	10252	s45b_2022.gsb	The Danish Agency for Data Supply and Infrastructure, https://sdfi.dk
4258	10256	gs_2022.gsb	The Danish Agency for Data Supply and Infrastructure, https://sdfi.dk
4258	10260	gsb_2022.gsb	The Danish Agency for Data Supply and Infrastructure, https://sdfi.dk
4258	10265	kk_2022.gsb	The Danish Agency for Data Supply and Infrastructure, https://sdfi.dk
4258	10268	os_2022.gsb	The Danish Agency for Data Supply and Infrastructure, https://sdfi.dk
4258	10272	TN15-ETRS89-to-SMITB20-IRF.gsb	Network Rail, UK.
4258	10277	TN15-ETRS89-to-RBEPP12-IRF.gsb	Network Rail, UK.
4258	10468	TN15-ETRS89-to-COV23-IRF.gsb	Coventry City Council.
4258	10623	TN15-ETRS89-to-ECML14-IRF.gsb	Network Rail.
4258	10628	TN15-ETRS89-to-WC05-IRF.gsb	Network Rail.
4258	20033	TN15-ETRS89-to-MWC18-IRF.gsb	Network Rail.
4265	4230	35160622_47161840_R40_E50.gsb	Istituto Geografico Militare (IGM), www.igmi.org
4265	4670	35160622_47161840_R40_F89.gsb	Istituto Geografico Militare (IGM), www.igmi.org
4265	6706	35160622_47161840_R40_F00.gsb	Istituto Geografico Militare (IGM), www.igmi.org
4267	4269	NA27NA83.GSB	Geodetic Service of Quebec.
4267	4269	NTv2_0.gsb	NR Canada, https://www.nrcan.gc.ca/
4267	4269	SK27-83.gsb	Saskatchewan Information Services Corporation (ISC) via ISO Geodetic Register.
4267	4326	NA27SCRS.GSB	OGP
4267	4326	NTv2_0.gsb	OGP
4267	4326	SK27-98.gsb	OGP
4267	8237	BC_27_98.GSB	GeoBC, Government of British Columbia, via ISO Geodetic Register.
4267	8237	NB2783v2.gsb	“Generation of a NAD27-NAD83(CSRS) NTv2-type Grid Shift File for New Brunswick”, Marcelo C. Santos and Carlos A. Garcia, Department of Geodesy and Geomatics Engineering, University of New Brunswick, October, 2011 via Service New Brunswick.
4267	8237	QUE27-98.gsb	Geodetic Service of Quebec. Contact alain.bernard@mrn.gouv.qc.ca
4267	8237	SK27-98.gsb	Dir Geodetic Surveys; SaskGeomatics Div.; Saskatchewan Property Management Company.
4267	8240	CRD27_00.GSB	GeoBC, Government of British Columbia, via ISO Geodetic Register.
4267	8240	NVI27_05.GSB	GeoBC, Government of British Columbia, via ISO Geodetic Register.
4267	8240	ON27CSv1.GSB	Land Information Ontario via ISO Geodetic Register.
4267	8240	TO27CSv1.GSB	Natural Resources Canada (NRCan), https://natural-resources.canada.ca
4267	8246	BC_27_05.GSB	GeoBC, Government of British Columbia, via ISO Geodetic Register.
4269	4326	AB_CSRS.DAC	OGP
4269	4326	NA83SCRS.GSB	OGP
4269	4326	SK83-98.gsb	OGP
4269	8237	BC_93_98.GSB	GeoBC, Government of British Columbia, via ISO Geodetic Register.
4269	8237	NAD83-98.gsb	Geodetic Service of Quebec. Contact alain.bernard@mrn.gouv.qc.ca
4269	8237	SK83-98.gsb	Dir Geodetic Surveys; SaskGeomatics Div.; Saskatchewan Property Management Company.
4269	8240	CRD93_00.GSB	GeoBC, Government of British Columbia, via ISO Geodetic Register.
4269	8240	NVI93_05.GSB	GeoBC, Government of British Columbia, via ISO Geodetic Register.
4269	8240	ON83CSv1.GSB	Land Information Ontario via ISO Geodetic Register.
4269	8246	AB_CSRS.DAC	Geodetic Control Section; Land and Forest Svc; Alberta Environment; http://www3.gov.ab.ca/env/land/dos/
4269	8246	BC_93_05.GSB	GeoBC, Government of British Columbia, via ISO Geodetic Register.
4269	8252	NLCSRSV4A.GSB	Canadian Geodetic Survey, Natural Resources Canada (NrCan).
4269	8255	ABCSRSV7.GSB	NR Canada, https://webapp.geod.nrcan.gc.ca/geod/data-donnees/transformations.php
4272	4167	nzgd2kgrid0005.gsb	Land Information New Zealand: LINZS25000 Standard for New Zealand Geodetic Datum 2000; 16 November 2007.
4272	4326	nzgd2kgrid0005.gsb	OGP
4274	4258	D73_ETRS89_geo.gsb	Instituto Geografico Portugues; http://www.igeo.pt
4277	4258	OSTN02_NTv2.gsb	Ordnance Survey of Great Britain, http://www.gps.gov.uk
4277	4258	OSTN15_NTv2_OSGBtoETRS.gsb	Ordnance Survey of Great Britain.
4277	4326	OSTN02_NTv2.gsb	OGP
4277	4326	OSTN15_NTv2_OSGBtoETRS.gsb	EPSG
4283	4326	GDA94_GDA2020_conformal_and_distortion.gsb	ANZLIC Intergovernmental Committee on Surveying and Mapping (ICSM) (http://www.icsm.gov.au).
4283	7844	GDA94_GDA2020_conformal.gsb	GDA2020 Technical Manual and ICSM Datum Technical Fact Sheet TN1 (http://www.icsm.gov.au).
4283	7844	GDA94_GDA2020_conformal_and_distortion.gsb	GDA2020 Technical Manual and ICSM Datum Technical Fact Sheet TN1 (http://www.icsm.gov.au).
4283	7844	GDA94_GDA2020_conformal_christmas_island.gsb	GDA2020 Technical Manual (http://www.icsm.gov.au).
4283	7844	GDA94_GDA2020_conformal_cocos_island.gsb	GDA2020 Technical Manual (http://www.icsm.gov.au)
4289	4258	rdtrans2008.gsb	Kadaster and Rijkswaterstaat CIV, working together under the name RDNAP.
4289	4258	rdtrans2018.gsb	NSGI: Netherlands partnership of Kadaster, Rijkswaterstaat and Hydrographic Service, http://www.nsgi.nl/.
4300	4258	tm75_etrs89.gsb	ESRI Ireland.
4300	4326	tm75_etrs89.gsb	OGP
4301	4612	tky2jgd.gsb	ESRI
4301	6668	tky2jgd.gsb	OGP
4312	4258	AT_GIS_GRID.gsb	Federal Office of Metrology and Surveying (BEV); http://www.bev.gv.at
4312	4258	AT_GIS_GRID_2021_09_28.gsb	Federal Office of Metrology and Surveying (BEV); http://www.bev.gv.at
4313	4258	bd72lb72_etrs89lb08.gsb	IGN Brussels www.ngi.be
4314	4258	BETA2007.gsb	BKG via EuroGeographics https://crs.bkg.bund.de/ or https://www.crs-geo.eu/
4314	4258	BWTA2017.gsb	Landesamt für Geoinformation und Landentwicklung - Baden-Württemberg (LGL).
4314	4258	HeTa2010.gsb	Hessisches Landesamt für Bodenmanagement und Geoinformation (HLBG).
4314	4258	SeTa2016.gsb	Landesamt für Vermessung, Geoinformation und Landentwicklung - Saarland (LVGL).
4314	4326	BETA2007.gsb	OGP
4326	4275	rgf93_ntf.gsb	OGP
4326	7844	GDA94_GDA2020_conformal_and_distortion.gsb	ANZLIC Intergovernmental Committee on Surveying and Mapping (ICSM) (http://www.icsm.gov.au).
4608	4269	May76v20.gsb	Geodetic Survey of Canada http://www.geod.nrcan.gc.ca/
4608	4326	May76v20.gsb	OGP
4608	8240	ON76CSv1.GSB	Land Information Ontario via ISO Geodetic Register.
4609	4269	CQ77NA83.GSB	Geodetic Service of Quebec.
4609	4326	CQ77NA83.GSB	OGP
4609	8237	CGQ77-98.gsb	Geodetic Service of Quebec. Contact alain.bernard@mrn.gouv.qc.ca
4612	4326	touhokutaiheiyouoki2011.gsb	IOGP
4612	6668	touhokutaiheiyouoki2011.gsb	ESRI
4618	4326	SAD69_003.gsb	OGP
4618	4674	SAD69_003.gsb	IBGE.
4659	8086	ISN93_ISN2016.gsb	National Land Survey of Iceland, www.lmi.is.
4670	6706	35160622_47161840_F89_F00.gsb	Istituto Geografico Militare (IGM), www.igmi.org
4674	8987	SIRGAS2000-to-SIRGAS-CONSIR17P01.gsb	SIRGAS Working Group I, “Relación y modelos de transformación entre las soluciones SIRGAS95, SIRGAS2000 y SIR17P01. Resultados obtenidos”, presented at SIMPOSIO SIRGAS 2021 Perú, 29 Nov-01 Dec 2021.
4745	4258	NTv2_SN.gsb	Saxony State Spatial Data and Land Survey Corporation (GeoSN).
4745	4326	BETA2007.gsb	OGP
4746	4258	de_tlbg_thuringen_NTv2gridTH.gsb	Thüringer Landesamt für Bodenmanagement und Geoinformation (TLBG).
4746	4326	BETA2007.gsb	OGP
4749	4644	RGNC1991_NEA74Noumea.gsb	ESRI
4749	4662	RGNC1991_IGN72GrandeTerre.gsb	ESRI
5324	8086	ISN2004_ISN2016.gsb	National Land Survey of Iceland, www.lmi.is.
5524	4326	CA61_003.gsb	OGP
5524	4674	CA61_003.gsb	IBGE.
5527	4326	SAD96_003.gsb	OGP
5527	4674	SAD96_003.gsb	IBGE.
8237	8240	CRD98_00.GSB	GeoBC, Government of British Columbia, via ISO Geodetic Register.
8237	8240	NVI98_05.GSB	GeoBC, Government of British Columbia, via ISO Geodetic Register.
8237	8246	BC_98_05.GSB	GeoBC, Government of British Columbia, via ISO Geodetic Register.
9299	4258	HS2TN15_NTv2.gsb	HS2 Limited.
9777	4275	rgf93_ntf.gsb	ESRI
9782	4275	rgf93_ntf.gsb	IOGP

NADCON¶

Source CRS	Target CRS	Version	Latitude shift file	Longitude shift file
4135	4269	NGS-Usa HI	hawaii.las	hawaii.los
4136	4269	NGS-Usa AK StL	stlrnc.las	stlrnc.los
4137	4269	NGS-Usa AK StP	stpaul.las	stpaul.los
4138	4269	NGS-Usa AK StG	stgeorge.las	stgeorge.los
4139	4269	NGS-PRVI	prvi.las	prvi.los
4169	4152	NGS-Asm E	eshpgn.las	eshpgn.los
4169	4152	NGS-Asm W	wshpgn.las	wshpgn.los
4267	4269	NGS-Usa AK	alaska.las	alaska.los
4267	4269	NGS-Usa Conus	conus.las	conus.los
4269	4152	NGS-Usa AL	alhpgn.las	alhpgn.los
4269	4152	NGS-Usa AR	arhpgn.las	arhpgn.los
4269	4152	NGS-Usa AZ	azhpgn.las	azhpgn.los
4269	4152	NGS-Usa CA n	cnhpgn.las	cnhpgn.los
4269	4152	NGS-Usa CO	cohpgn.las	cohpgn.los
4269	4152	NGS-Usa CA s	cshpgn.las	cshpgn.los
4269	4152	NGS-Usa ID MT e	emhpgn.las	emhpgn.los
4269	4152	NGS-Usa TX e	ethpgn.las	ethpgn.los
4269	4152	NGS-Usa FL	flhpgn.las	flhpgn.los
4269	4152	NGS-Usa GA	gahpgn.las	gahpgn.los
4269	4152	NGS-Usa HI	hihpgn.las	hihpgn.los
4269	4152	NGS-Usa IA	iahpgn.las	iahpgn.los
4269	4152	NGS-Usa IL	ilhpgn.las	ilhpgn.los
4269	4152	NGS-Usa IN	inhpgn.las	inhpgn.los
4269	4152	NGS-Usa KS	kshpgn.las	kshpgn.los
4269	4152	NGS-Usa KY	kyhpgn.las	kyhpgn.los
4269	4152	NGS-Usa LA	lahpgn.las	lahpgn.los
4269	4152	NGS-Usa DE MD	mdhpgn.las	mdhpgn.los
4269	4152	NGS-Usa ME	mehpgn.las	mehpgn.los
4269	4152	NGS-Usa MI	mihpgn.las	mihpgn.los
4269	4152	NGS-Usa MN	mnhpgn.las	mnhpgn.los
4269	4152	NGS-Usa MO	mohpgn.las	mohpgn.los
4269	4152	NGS-Usa MS	mshpgn.las	mshpgn.los
4269	4152	NGS-Usa NE	nbhpgn.las	nbhpgn.los
4269	4152	NGS-Usa NC	nchpgn.las	nchpgn.los
4269	4152	NGS-Usa ND	ndhpgn.las	ndhpgn.los
4269	4152	NGS-Usa NewEng	nehpgn.las	nehpgn.los
4269	4152	NGS-Usa NJ	njhpgn.las	njhpgn.los
4269	4152	NGS-Usa NM	nmhpgn.las	nmhpgn.los
4269	4152	NGS-Usa NV	nvhpgn.las	nvhpgn.los
4269	4152	NGS-Usa NY	nyhpgn.las	nyhpgn.los
4269	4152	NGS-Usa OH	ohhpgn.las	ohhpgn.los
4269	4152	NGS-Usa OK	okhpgn.las	okhpgn.los
4269	4152	NGS-Usa PA	pahpgn.las	pahpgn.los
4269	4152	NGS-PRVI	pvhpgn.las	pvhpgn.los
4269	4152	NGS-Usa SC	schpgn.las	schpgn.los
4269	4152	NGS-Usa SD	sdhpgn.las	sdhpgn.los
4269	4152	NGS-Usa TN	tnhpgn.las	tnhpgn.los
4269	4152	NGS-Usa UT	uthpgn.las	uthpgn.los
4269	4152	NGS-Usa VA	vahpgn.las	vahpgn.los
4269	4152	NGS-Usa WI	wihpgn.las	wihpgn.los
4269	4152	NGS-Usa ID MT w	wmhpgn.las	wmhpgn.los
4269	4152	NGS-Usa OR WA	wohpgn.las	wohpgn.los
4269	4152	NGS-Usa TX w	wthpgn.las	wthpgn.los
4269	4152	NGS-Usa WV	wvhpgn.las	wvhpgn.los
4269	4152	NGS-Usa WY	wyhpgn.las	wyhpgn.los
4675	4152	NGS-Gum	guhpgn.las	guhpgn.los
8351	4156	UGKK-Svk	Slovakia_JTSK03_to_JTSK.LAS.las	Slovakia_JTSK03_to_JTSK.LAS.los
8351	4156	UGKK-Svk	Slovakia_JTSK03_to_JTSK.LOS.las	Slovakia_JTSK03_to_JTSK.LOS.los

Define a custom Coordinate Operation¶

Custom Coordinate Operations are defined in epsg_operations.properties file. This file has to be placed into the user_projections directory, inside your data directory (create it if it doesn’t exist).

Each line in epsg_operations.properties will describe a coordinate operation consisting of a source CRS, a target CRS, and a math transform with its parameter values. Use the following syntax:

<source crs code>,<target crs code>=<WKT math transform>

Math transform is described in Well-Known Text syntax. Parameter names and value ranges are described in the EPSG Geodetic Parameter Registry.

Note

Use the Reprojection Console to learn from example and to test your custom definitions.

Examples¶

Custom NTv2 file:

4230,4258=PARAM_MT["NTv2", \
  PARAMETER["Latitude and longitude difference file", "100800401.gsb"]]

Geocentric transformation, preceded by an ellipsoid to geocentric conversion, and back geocentric to ellipsoid. The results is a concatenation of three math transforms:

4230,4258=CONCAT_MT[ \
  PARAM_MT["Ellipsoid_To_Geocentric", \
    PARAMETER["dim", 2], \
    PARAMETER["semi_major", 6378388.0], \
    PARAMETER["semi_minor", 6356911.9461279465]], \
  PARAM_MT["Position Vector transformation (geog2D domain)", \
    PARAMETER["dx", -116.641], \
    PARAMETER["dy", -56.931], \
    PARAMETER["dz", -110.559], \
    PARAMETER["ex", 0.8925078166311858], \
    PARAMETER["ey", 0.9207660950870382], \
    PARAMETER["ez", -0.9166407989620964], \
    PARAMETER["ppm", -3.5200000000346066]], \
  PARAM_MT["Geocentric_To_Ellipsoid", \
    PARAMETER["dim", 2], \
    PARAMETER["semi_major", 6378137.0], \
    PARAMETER["semi_minor", 6356752.314140356]]]

You can make use of existing grid shift files such as this explicit transformation from NAD27 to WGS84 made up of a NADCON transform from NAD27 to NAD83 followed by a Molodenski transform converting from the GRS80 Ellipsoid (used by NAD83) to the WGS84 Ellipsoid:

4267,4326=CONCAT_MT[ \
  PARAM_MT["NADCON", \
    PARAMETER["Latitude difference file", "conus.las"], \
    PARAMETER["Longitude difference file", "conus.los"]], \
  PARAM_MT["Molodenski", \
    PARAMETER["dim", 2], \
    PARAMETER["dx", 0.0], \
    PARAMETER["dy", 0.0], \
    PARAMETER["dz", 0.0], \
    PARAMETER["src_semi_major", 6378137.0], \
    PARAMETER["src_semi_minor", 6356752.314140356], \
    PARAMETER["tgt_semi_major", 6378137.0], \
    PARAMETER["tgt_semi_minor", 6356752.314245179]]]

Affine 2D transform operating directly in projected coordinates:

23031,25831=PARAM_MT["Affine", \
  PARAMETER["num_row", 3], \
  PARAMETER["num_col", 3], \
  PARAMETER["elt_0_0", 1.0000015503712145], \
  PARAMETER["elt_0_1", 0.00000758753979846734], \
  PARAMETER["elt_0_2", -129.549], \
  PARAMETER["elt_1_0", -0.00000758753979846734], \
  PARAMETER["elt_1_1", 1.0000015503712145], \
  PARAMETER["elt_1_2", -208.185]]

Each operation can be described in a single line, or can be split in several lines for readability, adding a backslash “\” at the end of each line, as in the former examples.

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Coordinate Operations¶

Reprojection Console¶

Add Grid Shift Transform files¶

List of available Grid Shift transforms¶

NTv2¶

NADCON¶

Define a custom Coordinate Operation¶

Examples¶

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