# ogr_srs_api.h: Spatial Reference System C API

C spatial reference system services and defines.

See also: ogr_spatialref.h

Defines

`SRS_WKT_WGS84_LAT_LONG`

  WGS 84 geodetic (lat/long) WKT / EPSG:4326 with lat,long ordering.

`SRS_PT_ALBERS_CONIC_EQUAL_AREA`

  Albers_Conic_Equal_Area projection.

`SRS_PT_AZIMUTHAL_EQUIDISTANT`

  Azimuthal_Equidistant projection.

`SRS_PT_CASSINI_SOLDNER`

  Cassini_Soldner projection.

`SRS_PT_CYLINDRICAL_EQUAL_AREA`

  Cylindrical_Equal_Area projection.

`SRS_PT_BONNE`

  Cylindrical_Equal_Area projection.

`SRS_PT_ECKERT_I`

  Eckert_I projection.

`SRS_PT_ECKERT_II`

  Eckert_II projection.

`SRS_PT_ECKERT_III`

  Eckert_III projection.

`SRS_PT_ECKERT_IV`

  Eckert_IV projection.

`SRS_PT_ECKERT_V`

  Eckert_V projection.

`SRS_PT_ECKERT_VI`

  Eckert_VI projection.

`SRS_PT_EQUIDISTANT_CONIC`

  Equidistant_Conic projection.

`SRS_PT_EQUIRECTANGULAR`

  Equirectangular projection.

`SRS_PT_GALL_STEREOGRAPHIC`

  Gall_Stereographic projection.

`SRS_PT_GAUSSSCHREIBERTMERCATOR`

  Gauss_Schreiber_Transverse_Mercator projection.

`SRS_PT_GEOSTATIONARY_SATELLITE`

  Geostationary_Satellite projection.

`SRS_PT_GOODE_HOMOLOSINE`

  Goode_Homolosine projection.

`SRS_PT_IGH`

  Interrupted_Goode_Homolosine projection.

`SRS_PT_GNOMONIC`

  Gnomonic projection.

`SRS_PT_HOTINE_OBLIQUE_MERCATOR_AZIMUTH_CENTER`

  Hotine_Oblique_Mercator_Azimuth_Center projection.

`SRS_PT_HOTINE_OBLIQUE_MERCATOR`

  Hotine_Oblique_Mercator projection.

`SRS_PT_HOTINE_OBLIQUE_MERCATOR_TWO_POINT_NATURAL_ORIGIN`

  Hotine_Oblique_Mercator_Two_Point_Natural_Origin projection.

`SRS_PT_LABORDE_OBLIQUE_MERCATOR`

  Laborde_Oblique_Mercator projection.

`SRS_PT_LAMBERT_CONFORMAL_CONIC_1SP`

  Lambert_Conformal_Conic_1SP projection.

`SRS_PT_LAMBERT_CONFORMAL_CONIC_2SP`

  Lambert_Conformal_Conic_2SP projection.

`SRS_PT_LAMBERT_CONFORMAL_CONIC_2SP_BELGIUM`

  Lambert_Conformal_Conic_2SP_Belgium projection.

`SRS_PT_LAMBERT_AZIMUTHAL_EQUAL_AREA`

  Lambert_Azimuthal_Equal_Area projection.

`SRS_PT_MERCATOR_1SP`

  Mercator_1SP projection.

`SRS_PT_MERCATOR_2SP`

  Mercator_2SP projection.

`SRS_PT_MERCATOR_AUXILIARY_SPHERE`

  Mercator_Auxiliary_Sphere is used used by ESRI to mean EPSG:3875.

`SRS_PT_MILLER_CYLINDRICAL`

  Miller_Cylindrical projection.

`SRS_PT_MOLLWEIDE`

  Mollweide projection.

`SRS_PT_NEW_ZEALAND_MAP_GRID`

  New_Zealand_Map_Grid projection.

`SRS_PT_OBLIQUE_STEREOGRAPHIC`

  Oblique_Stereographic projection.

`SRS_PT_ORTHOGRAPHIC`

  Orthographic projection.

`SRS_PT_POLAR_STEREOGRAPHIC`

  Polar_Stereographic projection.

`SRS_PT_POLYCONIC`

  Polyconic projection.

`SRS_PT_ROBINSON`

  Robinson projection.

`SRS_PT_SINUSOIDAL`

  Sinusoidal projection.

`SRS_PT_STEREOGRAPHIC`

  Stereographic projection.

`SRS_PT_SWISS_OBLIQUE_CYLINDRICAL`

  Swiss_Oblique_Cylindrical projection.

`SRS_PT_TRANSVERSE_MERCATOR`

  Transverse_Mercator projection.

`SRS_PT_TRANSVERSE_MERCATOR_SOUTH_ORIENTED`

  Transverse_Mercator_South_Orientated projection.

`SRS_PT_TRANSVERSE_MERCATOR_MI_21`

  Transverse_Mercator_MapInfo_21 projection.

`SRS_PT_TRANSVERSE_MERCATOR_MI_22`

  Transverse_Mercator_MapInfo_22 projection.

`SRS_PT_TRANSVERSE_MERCATOR_MI_23`

  Transverse_Mercator_MapInfo_23 projection.

`SRS_PT_TRANSVERSE_MERCATOR_MI_24`

  Transverse_Mercator_MapInfo_24 projection.

`SRS_PT_TRANSVERSE_MERCATOR_MI_25`

  Transverse_Mercator_MapInfo_25 projection.

`SRS_PT_TUNISIA_MINING_GRID`

  Tunisia_Mining_Grid projection.

`SRS_PT_TWO_POINT_EQUIDISTANT`

  Two_Point_Equidistant projection.

`SRS_PT_VANDERGRINTEN`

  VanDerGrinten projection.

`SRS_PT_KROVAK`

  Krovak projection.

`SRS_PT_IMW_POLYCONIC`

  International_Map_of_the_World_Polyconic projection.

`SRS_PT_WAGNER_I`

  Wagner_I projection.

`SRS_PT_WAGNER_II`

  Wagner_II projection.

`SRS_PT_WAGNER_III`

  Wagner_III projection.

`SRS_PT_WAGNER_IV`

  Wagner_IV projection.

`SRS_PT_WAGNER_V`

  Wagner_V projection.

`SRS_PT_WAGNER_VI`

  Wagner_VI projection.

`SRS_PT_WAGNER_VII`

  Wagner_VII projection.

`SRS_PT_QSC`

  Quadrilateralized_Spherical_Cube projection.

`SRS_PT_AITOFF`

  Aitoff projection.

`SRS_PT_WINKEL_I`

  Winkel_I projection.

`SRS_PT_WINKEL_II`

  Winkel_II projection.

`SRS_PT_WINKEL_TRIPEL`

  Winkel_Tripel projection.

`SRS_PT_CRASTER_PARABOLIC`

  Craster_Parabolic projection.

`SRS_PT_LOXIMUTHAL`

  Loximuthal projection.

`SRS_PT_QUARTIC_AUTHALIC`

  Quartic_Authalic projection.

`SRS_PT_SCH`

  Spherical_Cross_Track_Height projection.

`SRS_PP_CENTRAL_MERIDIAN`

  central_meridian projection parameter

`SRS_PP_SCALE_FACTOR`

  scale_factor projection parameter

`SRS_PP_STANDARD_PARALLEL_1`

  standard_parallel_1 projection parameter

`SRS_PP_STANDARD_PARALLEL_2`

  standard_parallel_2 projection parameter

`SRS_PP_PSEUDO_STD_PARALLEL_1`

  pseudo_standard_parallel_1 projection parameter

`SRS_PP_LONGITUDE_OF_CENTER`

  longitude_of_center projection parameter

`SRS_PP_LATITUDE_OF_CENTER`

  latitude_of_center projection parameter

`SRS_PP_LONGITUDE_OF_ORIGIN`

  longitude_of_origin projection parameter

`SRS_PP_LATITUDE_OF_ORIGIN`

  latitude_of_origin projection parameter

`SRS_PP_FALSE_EASTING`

  false_easting projection parameter

`SRS_PP_FALSE_NORTHING`

  false_northing projection parameter

`SRS_PP_AZIMUTH`

  azimuth projection parameter

`SRS_PP_LONGITUDE_OF_POINT_1`

  longitude_of_point_1 projection parameter

`SRS_PP_LATITUDE_OF_POINT_1`

  latitude_of_point_1 projection parameter

`SRS_PP_LONGITUDE_OF_POINT_2`

  longitude_of_point_2 projection parameter

`SRS_PP_LATITUDE_OF_POINT_2`

  latitude_of_point_2 projection parameter

`SRS_PP_LONGITUDE_OF_POINT_3`

  longitude_of_point_3 projection parameter

`SRS_PP_LATITUDE_OF_POINT_3`

  latitude_of_point_3 projection parameter

`SRS_PP_RECTIFIED_GRID_ANGLE`

  rectified_grid_angle projection parameter

`SRS_PP_LANDSAT_NUMBER`

  landsat_number projection parameter

`SRS_PP_PATH_NUMBER`

  path_number projection parameter

`SRS_PP_PERSPECTIVE_POINT_HEIGHT`

  perspective_point_height projection parameter

`SRS_PP_SATELLITE_HEIGHT`

  satellite_height projection parameter

`SRS_PP_FIPSZONE`

  fipszone projection parameter

`SRS_PP_ZONE`

  zone projection parameter

`SRS_PP_LATITUDE_OF_1ST_POINT`

  Latitude_Of_1st_Point projection parameter.

`SRS_PP_LONGITUDE_OF_1ST_POINT`

  Longitude_Of_1st_Point projection parameter.

`SRS_PP_LATITUDE_OF_2ND_POINT`

  Latitude_Of_2nd_Point projection parameter.

`SRS_PP_LONGITUDE_OF_2ND_POINT`

  Longitude_Of_2nd_Point projection parameter.

`SRS_PP_PEG_POINT_LATITUDE`

  peg_point_latitude projection parameter

`SRS_PP_PEG_POINT_LONGITUDE`

  peg_point_longitude projection parameter

`SRS_PP_PEG_POINT_HEADING`

  peg_point_heading projection parameter

`SRS_PP_PEG_POINT_HEIGHT`

  peg_point_height projection parameter

`SRS_UL_METER`

  Linear unit Meter.

`SRS_UL_FOOT`

  Linear unit Foot (International)

`SRS_UL_FOOT_CONV`

  Linear unit Foot (International) conversion factor to meter.

`SRS_UL_US_FOOT`

  Linear unit Foot.

`SRS_UL_US_FOOT_CONV`

  Linear unit Foot conversion factor to meter.

`SRS_UL_NAUTICAL_MILE`

  Linear unit Nautical Mile.

`SRS_UL_NAUTICAL_MILE_CONV`

  Linear unit Nautical Mile conversion factor to meter.

`SRS_UL_LINK`

  Linear unit Link.

`SRS_UL_LINK_CONV`

  Linear unit Link conversion factor to meter.

`SRS_UL_CHAIN`

  Linear unit Chain.

`SRS_UL_CHAIN_CONV`

  Linear unit Chain conversion factor to meter.

`SRS_UL_ROD`

  Linear unit Rod.

`SRS_UL_ROD_CONV`

  Linear unit Rod conversion factor to meter.

`SRS_UL_LINK_Clarke`

  Linear unit Link_Clarke.

`SRS_UL_LINK_Clarke_CONV`

  Linear unit Link_Clarke conversion factor to meter.

`SRS_UL_KILOMETER`

  Linear unit Kilometer.

`SRS_UL_KILOMETER_CONV`

  Linear unit Kilometer conversion factor to meter.

`SRS_UL_DECIMETER`

  Linear unit Decimeter.

`SRS_UL_DECIMETER_CONV`

  Linear unit Decimeter conversion factor to meter.

`SRS_UL_CENTIMETER`

  Linear unit Decimeter.

`SRS_UL_CENTIMETER_CONV`

  Linear unit Decimeter conversion factor to meter.

`SRS_UL_MILLIMETER`

  Linear unit Millimeter.

`SRS_UL_MILLIMETER_CONV`

  Linear unit Millimeter conversion factor to meter.

`SRS_UL_INTL_NAUT_MILE`

  Linear unit Nautical_Mile_International.

`SRS_UL_INTL_NAUT_MILE_CONV`

  Linear unit Nautical_Mile_International conversion factor to meter.

`SRS_UL_INTL_INCH`

  Linear unit Inch_International.

`SRS_UL_INTL_INCH_CONV`

  Linear unit Inch_International conversion factor to meter.

`SRS_UL_INTL_FOOT`

  Linear unit Foot_International.

`SRS_UL_INTL_FOOT_CONV`

  Linear unit Foot_International conversion factor to meter.

`SRS_UL_INTL_YARD`

  Linear unit Yard_International.

`SRS_UL_INTL_YARD_CONV`

  Linear unit Yard_International conversion factor to meter.

`SRS_UL_INTL_STAT_MILE`

  Linear unit Statute_Mile_International.

`SRS_UL_INTL_STAT_MILE_CONV`

  Linear unit Statute_Mile_Internationalconversion factor to meter.

`SRS_UL_INTL_FATHOM`

  Linear unit Fathom_International.

`SRS_UL_INTL_FATHOM_CONV`

  Linear unit Fathom_International conversion factor to meter.

`SRS_UL_INTL_CHAIN`

  Linear unit Chain_International.

`SRS_UL_INTL_CHAIN_CONV`

  Linear unit Chain_International conversion factor to meter.

`SRS_UL_INTL_LINK`

  Linear unit Link_International.

`SRS_UL_INTL_LINK_CONV`

  Linear unit Link_International conversion factor to meter.

`SRS_UL_US_INCH`

  Linear unit Inch_US_Surveyor.

`SRS_UL_US_INCH_CONV`

  Linear unit Inch_US_Surveyor conversion factor to meter.

`SRS_UL_US_YARD`

  Linear unit Yard_US_Surveyor.

`SRS_UL_US_YARD_CONV`

  Linear unit Yard_US_Surveyor conversion factor to meter.

`SRS_UL_US_CHAIN`

  Linear unit Chain_US_Surveyor.

`SRS_UL_US_CHAIN_CONV`

  Linear unit Chain_US_Surveyor conversion factor to meter.

`SRS_UL_US_STAT_MILE`

  Linear unit Statute_Mile_US_Surveyor.

`SRS_UL_US_STAT_MILE_CONV`

  Linear unit Statute_Mile_US_Surveyor conversion factor to meter.

`SRS_UL_INDIAN_YARD`

  Linear unit Yard_Indian.

`SRS_UL_INDIAN_YARD_CONV`

  Linear unit Yard_Indian conversion factor to meter.

`SRS_UL_INDIAN_FOOT`

  Linear unit Foot_Indian.

`SRS_UL_INDIAN_FOOT_CONV`

  Linear unit Foot_Indian conversion factor to meter.

`SRS_UL_INDIAN_CHAIN`

  Linear unit Chain_Indian.

`SRS_UL_INDIAN_CHAIN_CONV`

  Linear unit Chain_Indian conversion factor to meter.

`SRS_UA_DEGREE`

  Angular unit degree.

`SRS_UA_DEGREE_CONV`

  Angular unit degree conversion factor to radians.

`SRS_UA_RADIAN`

  Angular unit radian.

`SRS_PM_GREENWICH`

  Prime meridian Greenwich.

`SRS_DN_NAD27`

  North_American_Datum_1927 datum name.

`SRS_DN_NAD83`

  North_American_Datum_1983 datum name.

`SRS_DN_WGS72`

  WGS_1972 datum name.

`SRS_DN_WGS84`

  WGS_1984 datum name.

`SRS_WGS84_SEMIMAJOR`

  Semi-major axis of the WGS84 ellipsoid.

`SRS_WGS84_INVFLATTENING`

  Inverse flattening of the WGS84 ellipsoid.

Typedefs

typedef void *`OGRSpatialReferenceH`

  Opaque type for a Spatial Reference object.

typedef void *`OGRCoordinateTransformationH`

  Opaque type for a coordinate transformation object.

typedef struct OSRCRSListParameters `OSRCRSListParameters`

  Structure to describe optional parameters to OSRGetCRSInfoListFromDatabase()

  Unused for now.

typedef struct OGRCoordinateTransformationOptions *`OGRCoordinateTransformationOptionsH`

  Coordinate transformation options.

Enums

enum `OGRAxisOrientation`

  Axis orientations (corresponds to CS_AxisOrientationEnum).

  Values:

  `OAO_Other` = 0

    Other.

  `OAO_North` = 1

    North.

  `OAO_South` = 2

    South.

  `OAO_East` = 3

    East.

  `OAO_West` = 4

    West.

  `OAO_Up` = 5

    Up (to space)

  `OAO_Down` = 6

    Down (to Earth center)

enum `OSRAxisMappingStrategy`

  Data axis to CRS axis mapping strategy.

  Values:

  `OAMS_TRADITIONAL_GIS_ORDER`

    Traditional GIS order.

  `OAMS_AUTHORITY_COMPLIANT`

    Compliant with the order mandated by the CRS authority.

  `OAMS_CUSTOM`

    Custom.

enum `OSRCRSType`

  Type of Coordinate Reference System (CRS).

  Values:

  `OSR_CRS_TYPE_GEOGRAPHIC_2D`

    Geographic 2D CRS.

  `OSR_CRS_TYPE_GEOGRAPHIC_3D`

    Geographic 3D CRS.

  `OSR_CRS_TYPE_GEOCENTRIC`

    Geocentric CRS.

  `OSR_CRS_TYPE_PROJECTED`

    Projected CRS.

  `OSR_CRS_TYPE_VERTICAL`

    Vertical CRS.

  `OSR_CRS_TYPE_COMPOUND`

    Compound CRS.

  `OSR_CRS_TYPE_OTHER`

    Other.

Functions

const char *`OSRAxisEnumToName`(OGRAxisOrientation eOrientation)

  Return the string representation for the OGRAxisOrientation enumeration.

  For example “NORTH” for OAO_North.

  Return

    an internal string

void `OSRSetPROJSearchPaths`(const char *const *papszPaths)

  Set the search path(s) for PROJ resource files.

  Since

    GDAL 3.0

  Parameters

    - `papszPaths`: NULL terminated list of directory paths.

char **`OSRGetPROJSearchPaths`(void)

  Get the search path(s) for PROJ resource files.

  Return

    NULL terminated list of directory paths. To be freed with CSLDestroy()

  Since

    GDAL 3.0.3

void `OSRGetPROJVersion`(int *pnMajor, int *pnMinor, int *pnPatch)

  Get the PROJ version.

  Since

    GDAL 3.0.1

  Parameters

    - `pnMajor`: Pointer to major version number, or NULL

    - `pnMinor`: Pointer to minor version number, or NULL

    - `pnPatch`: Pointer to patch version number, or NULL

OGRSpatialReferenceH `OSRNewSpatialReference`(const char *pszWKT)

  Constructor.

  This function is the same as OGRSpatialReference::OGRSpatialReference()

OGRSpatialReferenceH `OSRCloneGeogCS`(OGRSpatialReferenceH hSource)

  Make a duplicate of the GEOGCS node of this OGRSpatialReference object.

  This function is the same as OGRSpatialReference::CloneGeogCS().

OGRSpatialReferenceH `OSRClone`(OGRSpatialReferenceH hSRS)

  Make a duplicate of this OGRSpatialReference.

  This function is the same as OGRSpatialReference::Clone()

void `OSRDestroySpatialReference`(OGRSpatialReferenceH hSRS)

  OGRSpatialReference destructor.

  This function is the same as OGRSpatialReference::~OGRSpatialReference() and OGRSpatialReference::DestroySpatialReference()

  Parameters

    - `hSRS`: the object to delete

int `OSRReference`(OGRSpatialReferenceH hSRS)

  Increments the reference count by one.

  This function is the same as OGRSpatialReference::Reference()

int `OSRDereference`(OGRSpatialReferenceH hSRS)

  Decrements the reference count by one.

  This function is the same as OGRSpatialReference::Dereference()

void `OSRRelease`(OGRSpatialReferenceH hSRS)

  Decrements the reference count by one, and destroy if zero.

  This function is the same as OGRSpatialReference::Release()

OGRErr `OSRValidate`(OGRSpatialReferenceH hSRS)

  Validate SRS tokens.

  This function is the same as the C++ method OGRSpatialReference::Validate().

OGRErr `OSRImportFromEPSG`(OGRSpatialReferenceH hSRS, int nCode)

  Initialize SRS based on EPSG geographic, projected or vertical CRS code.

  This function is the same as OGRSpatialReference::importFromEPSG().

OGRErr `OSRImportFromEPSGA`(OGRSpatialReferenceH hSRS, int nCode)

  Initialize SRS based on EPSG geographic, projected or vertical CRS code.

  This function is the same as OGRSpatialReference::importFromEPSGA().

OGRErr `OSRImportFromWkt`(OGRSpatialReferenceH hSRS, char **ppszInput)

  Import from WKT string.

  Consult also the OGC WKT Coordinate System Issues page for implementation details of WKT in OGR.

  This function is the same as OGRSpatialReference::importFromWkt().

OGRErr `OSRImportFromProj4`(OGRSpatialReferenceH hSRS, const char *pszProj4)

  Import PROJ coordinate string.

  This function is the same as OGRSpatialReference::importFromProj4().

OGRErr `OSRImportFromESRI`(OGRSpatialReferenceH hSRS, char **papszPrj)

  Import coordinate system from ESRI .prj format(s).

  This function is the same as the C++ method OGRSpatialReference::importFromESRI().

OGRErr `OSRImportFromPCI`(OGRSpatialReferenceH hSRS, const char *pszProj, const char *pszUnits, double *padfPrjParams)

  Import coordinate system from PCI projection definition.

  This function is the same as OGRSpatialReference::importFromPCI().

OGRErr `OSRImportFromUSGS`(OGRSpatialReferenceH hSRS, long iProjsys, long iZone, double *padfPrjParams, long iDatum)

  Import coordinate system from USGS projection definition.

  This function is the same as OGRSpatialReference::importFromUSGS().

OGRErr `OSRImportFromXML`(OGRSpatialReferenceH hSRS, const char *pszXML)

  Import coordinate system from XML format (GML only currently).

  This function is the same as OGRSpatialReference::importFromXML().

OGRErr `OSRImportFromDict`(OGRSpatialReferenceH hSRS, const char *pszDictFile, const char *pszCode)

  Read SRS from WKT dictionary.

  This method will attempt to find the indicated coordinate system identity in the indicated dictionary file. If found, the WKT representation is imported and used to initialize this OGRSpatialReference.

  More complete information on the format of the dictionary files can be found in the epsg.wkt file in the GDAL data tree. The dictionary files are searched for in the “GDAL” domain using CPLFindFile(). Normally this results in searching /usr/local/share/gdal or somewhere similar.

  This method is the same as the C++ method OGRSpatialReference::importFromDict().

  Return

    OGRERR_NONE on success, or OGRERR_SRS_UNSUPPORTED if the code isn’t found, and OGRERR_SRS_FAILURE if something more dramatic goes wrong.

  Parameters

    - `hSRS`: spatial reference system handle.

    - `pszDictFile`: the name of the dictionary file to load.

    - `pszCode`: the code to lookup in the dictionary.

OGRErr `OSRImportFromPanorama`(OGRSpatialReferenceH hSRS, long iProjSys, long iDatum, long iEllips, double *padfPrjParams)

  Import coordinate system from “Panorama” GIS projection definition.

  See OGRSpatialReference::importFromPanorama()

OGRErr `OSRImportFromOzi`(OGRSpatialReferenceH hSRS, const char *const *papszLines)

  Import coordinate system from OziExplorer projection definition.

  This function will import projection definition in style, used by OziExplorer software.

  Note: another version of this function with a different signature existed in GDAL 1.X.

  Return

    OGRERR_NONE on success or an error code in case of failure.

  Since

    OGR 2.0

  Parameters

    - `hSRS`: spatial reference object.

    - `papszLines`: Map file lines. This is an array of strings containing the whole OziExplorer .MAP file. The array is terminated by a NULL pointer.

OGRErr `OSRImportFromMICoordSys`(OGRSpatialReferenceH hSRS, const char *pszCoordSys)

  Import Mapinfo style CoordSys definition.

  This method is the equivalent of the C++ method OGRSpatialReference::importFromMICoordSys

OGRErr `OSRImportFromERM`(OGRSpatialReferenceH hSRS, const char *pszProj, const char *pszDatum, const char *pszUnits)

  Create OGR WKT from ERMapper projection definitions.

  This function is the same as OGRSpatialReference::importFromERM().

OGRErr `OSRImportFromUrl`(OGRSpatialReferenceH hSRS, const char *pszUrl)

  Set spatial reference from a URL.

  This function is the same as OGRSpatialReference::importFromUrl()

OGRErr `OSRExportToWkt`(OGRSpatialReferenceH hSRS, char **ppszReturn)

  Convert this SRS into WKT 1 format.

  Consult also the OGC WKT Coordinate System Issues page for implementation details of WKT in OGR.

  The WKT version can be overridden by using the OSR_WKT_FORMAT configuration option. Valid values are the one of the FORMAT option of exportToWkt( char ** ppszResult, const char* const* papszOptions ) const

  This function is the same as OGRSpatialReference::exportToWkt().

OGRErr `OSRExportToWktEx`(OGRSpatialReferenceH hSRS, char **ppszResult, const char *const *papszOptions)

  Convert this SRS into WKT format.

  This function is the same as OGRSpatialReference::exportToWkt(char ** ppszResult,const char* const* papszOptions ) const

  Since

    GDAL 3.0

OGRErr `OSRExportToPrettyWkt`(OGRSpatialReferenceH hSRS, char **ppszReturn, int bSimplify)

  Convert this SRS into a nicely formatted WKT 1 string for display to a person.

  The WKT version can be overridden by using the OSR_WKT_FORMAT configuration option. Valid values are the one of the FORMAT option of exportToWkt( char ** ppszResult, const char* const* papszOptions ) const

  This function is the same as OGRSpatialReference::exportToPrettyWkt().

OGRErr `OSRExportToPROJJSON`(OGRSpatialReferenceH hSRS, char **ppszReturn, const char *const *papszOptions)

  Convert this SRS into PROJJSON format.

  This function is the same as OGRSpatialReference::exportToPROJJSON() const

  Since

    GDAL 3.1 and PROJ 6.2

OGRErr `OSRExportToProj4`(OGRSpatialReferenceH hSRS, char **ppszReturn)

  Export coordinate system in PROJ.4 legacy format.

  This function is the same as

  OGRSpatialReference::exportToProj4().
  Warning

    Use of this function is discouraged. Its behavior in GDAL >= 3 / PROJ >= 6 is significantly different from earlier versions. In particular +datum will only encode WGS84, NAD27 and NAD83, and +towgs84/+nadgrids terms will be missing most of the time. PROJ strings to encode CRS should be considered as a legacy solution. Using a AUTHORITY:CODE or WKT representation is the recommended way.

OGRErr `OSRExportToPCI`(OGRSpatialReferenceH hSRS, char **ppszProj, char **ppszUnits, double **ppadfPrjParams)

  Export coordinate system in PCI projection definition.

  This function is the same as OGRSpatialReference::exportToPCI().

OGRErr `OSRExportToUSGS`(OGRSpatialReferenceH hSRS, long *piProjSys, long *piZone, double **ppadfPrjParams, long *piDatum)

  Export coordinate system in USGS GCTP projection definition.

  This function is the same as OGRSpatialReference::exportToUSGS().

OGRErr `OSRExportToXML`(OGRSpatialReferenceH hSRS, char **ppszRawXML, const char *pszDialect)

  Export coordinate system in XML format.

  This function is the same as OGRSpatialReference::exportToXML().

OGRErr `OSRExportToPanorama`(OGRSpatialReferenceH hSRS, long *piProjSys, long *piDatum, long *piEllips, long *piZone, double *padfPrjParams)

  Export coordinate system in “Panorama” GIS projection definition.

  See OGRSpatialReference::exportToPanorama()

OGRErr `OSRExportToMICoordSys`(OGRSpatialReferenceH hSRS, char **ppszReturn)

  Export coordinate system in Mapinfo style CoordSys format.

  This method is the equivalent of the C++ method OGRSpatialReference::exportToMICoordSys

OGRErr `OSRExportToERM`(OGRSpatialReferenceH hSRS, char *pszProj, char *pszDatum, char *pszUnits)

  Convert coordinate system to ERMapper format.

  This function is the same as OGRSpatialReference::exportToERM().

OGRErr `OSRMorphToESRI`(OGRSpatialReferenceH hSRS)

  Convert in place to ESRI WKT format.

  This function is the same as the C++ method OGRSpatialReference::morphToESRI().

OGRErr `OSRMorphFromESRI`(OGRSpatialReferenceH hSRS)

  Convert in place from ESRI WKT format.

  This function is the same as the C++ method OGRSpatialReference::morphFromESRI().

OGRSpatialReferenceH `OSRConvertToOtherProjection`(OGRSpatialReferenceH hSRS, const char *pszTargetProjection, const char *const *papszOptions)

  Convert to another equivalent projection.

  Currently implemented:

  - SRS_PT_MERCATOR_1SP to SRS_PT_MERCATOR_2SP

  - SRS_PT_MERCATOR_2SP to SRS_PT_MERCATOR_1SP

  - SRS_PT_LAMBERT_CONFORMAL_CONIC_1SP to SRS_PT_LAMBERT_CONFORMAL_CONIC_2SP

  - SRS_PT_LAMBERT_CONFORMAL_CONIC_2SP to SRS_PT_LAMBERT_CONFORMAL_CONIC_1SP

  Return

    a new SRS, or NULL in case of error.

  Since

    GDAL 2.3

  Parameters

    - `hSRS`: source SRS

    - `pszTargetProjection`: target projection.

    - `papszOptions`: lists of options. None supported currently.

const char *`OSRGetName`(OGRSpatialReferenceH hSRS)

  Return the CRS name.

  The returned value is only short lived and should not be used after other calls to methods on this object.

  Since

    GDAL 3.0

OGRErr `OSRSetAttrValue`(OGRSpatialReferenceH hSRS, const char *pszNodePath, const char *pszNewNodeValue)

  Set attribute value in spatial reference.

  This function is the same as OGRSpatialReference::SetNode()

const char *`OSRGetAttrValue`(OGRSpatialReferenceH hSRS, const char *pszName, int iChild)

  Fetch indicated attribute of named node.

  This function is the same as OGRSpatialReference::GetAttrValue()

OGRErr `OSRSetAngularUnits`(OGRSpatialReferenceH hSRS, const char *pszUnits, double dfInRadians)

  Set the angular units for the geographic coordinate system.

  This function is the same as OGRSpatialReference::SetAngularUnits()

double `OSRGetAngularUnits`(OGRSpatialReferenceH hSRS, char **ppszName)

  Fetch angular geographic coordinate system units.

  This function is the same as OGRSpatialReference::GetAngularUnits()

OGRErr `OSRSetLinearUnits`(OGRSpatialReferenceH hSRS, const char *pszUnits, double dfInMeters)

  Set the linear units for the projection.

  This function is the same as OGRSpatialReference::SetLinearUnits()

OGRErr `OSRSetTargetLinearUnits`(OGRSpatialReferenceH hSRS, const char *pszTargetKey, const char *pszUnits, double dfInMeters)

  Set the linear units for the target node.

  This function is the same as OGRSpatialReference::SetTargetLinearUnits()

  Since

    OGR 1.9.0

OGRErr `OSRSetLinearUnitsAndUpdateParameters`(OGRSpatialReferenceH hSRS, const char *pszUnits, double dfInMeters)

  Set the linear units for the projection.

  This function is the same as OGRSpatialReference::SetLinearUnitsAndUpdateParameters()

double `OSRGetLinearUnits`(OGRSpatialReferenceH hSRS, char **ppszName)

  Fetch linear projection units.

  This function is the same as OGRSpatialReference::GetLinearUnits()

double `OSRGetTargetLinearUnits`(OGRSpatialReferenceH hSRS, const char *pszTargetKey, char **ppszName)

  Fetch linear projection units.

  This function is the same as OGRSpatialReference::GetTargetLinearUnits()

  Since

    OGR 1.9.0

double `OSRGetPrimeMeridian`(OGRSpatialReferenceH hSRS, char **ppszName)

  Fetch prime meridian info.

  This function is the same as OGRSpatialReference::GetPrimeMeridian()

int `OSRIsGeographic`(OGRSpatialReferenceH hSRS)

  Check if geographic coordinate system.

  This function is the same as OGRSpatialReference::IsGeographic().

int `OSRIsDerivedGeographic`(OGRSpatialReferenceH hSRS)

  Check if derived geographic coordinate system.

  (for example a rotated long/lat grid)

  This function is the same as OGRSpatialReference::IsDerivedGeographic().

int `OSRIsLocal`(OGRSpatialReferenceH hSRS)

  Check if local coordinate system.

  This function is the same as OGRSpatialReference::IsLocal().

int `OSRIsProjected`(OGRSpatialReferenceH hSRS)

  Check if projected coordinate system.

  This function is the same as OGRSpatialReference::IsProjected().

int `OSRIsCompound`(OGRSpatialReferenceH hSRS)

  Check if the coordinate system is compound.

  This function is the same as OGRSpatialReference::IsCompound().

int `OSRIsGeocentric`(OGRSpatialReferenceH hSRS)

  Check if geocentric coordinate system.

  This function is the same as OGRSpatialReference::IsGeocentric().

  Since

    OGR 1.9.0

int `OSRIsVertical`(OGRSpatialReferenceH hSRS)

  Check if vertical coordinate system.

  This function is the same as OGRSpatialReference::IsVertical().

  Since

    OGR 1.8.0

int `OSRIsSameGeogCS`(OGRSpatialReferenceH hSRS1, OGRSpatialReferenceH hSRS2)

  Do the GeogCS’es match?

  This function is the same as OGRSpatialReference::IsSameGeogCS().

int `OSRIsSameVertCS`(OGRSpatialReferenceH hSRS1, OGRSpatialReferenceH hSRS2)

  Do the VertCS’es match?

  This function is the same as OGRSpatialReference::IsSameVertCS().

int `OSRIsSame`(OGRSpatialReferenceH hSRS1, OGRSpatialReferenceH hSRS2)

  Do these two spatial references describe the same system ?

  This function is the same as OGRSpatialReference::IsSame().

int `OSRIsSameEx`(OGRSpatialReferenceH hSRS1, OGRSpatialReferenceH hSRS2, const char *const *papszOptions)

  Do these two spatial references describe the same system ?

  This function is the same as OGRSpatialReference::IsSame().

OGRErr `OSRSetLocalCS`(OGRSpatialReferenceH hSRS, const char *pszName)

  Set the user visible LOCAL_CS name.

  This function is the same as OGRSpatialReference::SetLocalCS()

OGRErr `OSRSetProjCS`(OGRSpatialReferenceH hSRS, const char *pszName)

  Set the user visible PROJCS name.

  This function is the same as OGRSpatialReference::SetProjCS()

OGRErr `OSRSetGeocCS`(OGRSpatialReferenceH hSRS, const char *pszName)

  Set the user visible PROJCS name.

  This function is the same as OGRSpatialReference::SetGeocCS()

  Since

    OGR 1.9.0

OGRErr `OSRSetWellKnownGeogCS`(OGRSpatialReferenceH hSRS, const char *pszName)

  Set a GeogCS based on well known name.

  This function is the same as OGRSpatialReference::SetWellKnownGeogCS()

OGRErr `OSRSetFromUserInput`(OGRSpatialReferenceH hSRS, const char *pszDef)

  Set spatial reference from various text formats.

  This function is the same as OGRSpatialReference::SetFromUserInput()

OGRErr `OSRCopyGeogCSFrom`(OGRSpatialReferenceH hSRS, const OGRSpatialReferenceH hSrcSRS)

  Copy GEOGCS from another OGRSpatialReference.

  This function is the same as OGRSpatialReference::CopyGeogCSFrom()

OGRErr `OSRSetTOWGS84`(OGRSpatialReferenceH hSRS, double dfDX, double dfDY, double dfDZ, double dfEX, double dfEY, double dfEZ, double dfPPM)

  Set the Bursa-Wolf conversion to WGS84.

  This function is the same as OGRSpatialReference::SetTOWGS84().

OGRErr `OSRGetTOWGS84`(OGRSpatialReferenceH hSRS, double *padfCoeff, int nCoeffCount)

  Fetch TOWGS84 parameters, if available.

  This function is the same as OGRSpatialReference::GetTOWGS84().

OGRErr `OSRAddGuessedTOWGS84`(OGRSpatialReferenceH hSRS)

  Try to add a a 3-parameter or 7-parameter Helmert transformation to WGS84.

  This function is the same as OGRSpatialReference::AddGuessedTOWGS84().

  Since

    GDAL 3.0.3

OGRErr `OSRSetCompoundCS`(OGRSpatialReferenceH hSRS, const char *pszName, OGRSpatialReferenceH hHorizSRS, OGRSpatialReferenceH hVertSRS)

  Setup a compound coordinate system.

  This function is the same as OGRSpatialReference::SetCompoundCS()

OGRErr `OSRPromoteTo3D`(OGRSpatialReferenceH hSRS, const char *pszName)

  “Promotes” a 2D CRS to a 3D CRS one.

  See OGRSpatialReference::PromoteTo3D()

  Since

    GDAL 3.1 and PROJ 6.3

OGRErr `OSRDemoteTo2D`(OGRSpatialReferenceH hSRS, const char *pszName)

  “Demote” a 3D CRS to a 2D CRS one.

  See OGRSpatialReference::DemoteTo2D()

  Since

    GDAL 3.2 and PROJ 6.3

OGRErr `OSRSetGeogCS`(OGRSpatialReferenceH hSRS, const char *pszGeogName, const char *pszDatumName, const char *pszEllipsoidName, double dfSemiMajor, double dfInvFlattening, const char *pszPMName, double dfPMOffset, const char *pszUnits, double dfConvertToRadians)

  Set geographic coordinate system.

  This function is the same as OGRSpatialReference::SetGeogCS()

OGRErr `OSRSetVertCS`(OGRSpatialReferenceH hSRS, const char *pszVertCSName, const char *pszVertDatumName, int nVertDatumType)

  Setup the vertical coordinate system.

  This function is the same as OGRSpatialReference::SetVertCS()

  Since

    OGR 1.9.0

double `OSRGetSemiMajor`(OGRSpatialReferenceH hSRS, OGRErr *pnErr)

  Get spheroid semi major axis.

  This function is the same as OGRSpatialReference::GetSemiMajor()

double `OSRGetSemiMinor`(OGRSpatialReferenceH hSRS, OGRErr *pnErr)

  Get spheroid semi minor axis.

  This function is the same as OGRSpatialReference::GetSemiMinor()

double `OSRGetInvFlattening`(OGRSpatialReferenceH hSRS, OGRErr *pnErr)

  Get spheroid inverse flattening.

  This function is the same as OGRSpatialReference::GetInvFlattening()

OGRErr `OSRSetAuthority`(OGRSpatialReferenceH hSRS, const char *pszTargetKey, const char *pszAuthority, int nCode)

  Set the authority for a node.

  This function is the same as OGRSpatialReference::SetAuthority().

const char *`OSRGetAuthorityCode`(OGRSpatialReferenceH hSRS, const char *pszTargetKey)

  Get the authority code for a node.

  This function is the same as OGRSpatialReference::GetAuthorityCode().

const char *`OSRGetAuthorityName`(OGRSpatialReferenceH hSRS, const char *pszTargetKey)

  Get the authority name for a node.

  This function is the same as OGRSpatialReference::GetAuthorityName().

int `OSRGetAreaOfUse`(OGRSpatialReferenceH hSRS, double *pdfWestLongitudeDeg, double *pdfSouthLatitudeDeg, double *pdfEastLongitudeDeg, double *pdfNorthLatitudeDeg, const char **ppszAreaName)

  Return the area of use of the CRS.

  This function is the same as the OGRSpatialReference::GetAreaOfUse() method.

  Since

    GDAL 3.0

OGRErr `OSRSetProjection`(OGRSpatialReferenceH hSRS, const char *pszProjection)

  Set a projection name.

  This function is the same as OGRSpatialReference::SetProjection()

OGRErr `OSRSetProjParm`(OGRSpatialReferenceH hSRS, const char *pszParmName, double dfValue)

  Set a projection parameter value.

  This function is the same as OGRSpatialReference::SetProjParm()

double `OSRGetProjParm`(OGRSpatialReferenceH hSRS, const char *pszParmName, double dfDefault, OGRErr *pnErr)

  Fetch a projection parameter value.

  This function is the same as OGRSpatialReference::GetProjParm()

OGRErr `OSRSetNormProjParm`(OGRSpatialReferenceH hSRS, const char *pszParmName, double dfValue)

  Set a projection parameter with a normalized value.

  This function is the same as OGRSpatialReference::SetNormProjParm()

double `OSRGetNormProjParm`(OGRSpatialReferenceH hSRS, const char *pszParmName, double dfDefault, OGRErr *pnErr)

  This function is the same as OGRSpatialReference::

  This function is the same as OGRSpatialReference::GetNormProjParm()

OGRErr `OSRSetUTM`(OGRSpatialReferenceH hSRS, int nZone, int bNorth)

  Set UTM projection definition.

  This is the same as the C++ method OGRSpatialReference::SetUTM()

int `OSRGetUTMZone`(OGRSpatialReferenceH hSRS, int *pbNorth)

  Get utm zone information.

  This is the same as the C++ method OGRSpatialReference::GetUTMZone()

OGRErr `OSRSetStatePlane`(OGRSpatialReferenceH hSRS, int nZone, int bNAD83)

  Set State Plane projection definition.

  This function is the same as OGRSpatialReference::SetStatePlane().

OGRErr `OSRSetStatePlaneWithUnits`(OGRSpatialReferenceH hSRS, int nZone, int bNAD83, const char *pszOverrideUnitName, double dfOverrideUnit)

  Set State Plane projection definition.

  This function is the same as OGRSpatialReference::SetStatePlane().

OGRErr `OSRAutoIdentifyEPSG`(OGRSpatialReferenceH hSRS)

  Set EPSG authority info if possible.

  This function is the same as OGRSpatialReference::AutoIdentifyEPSG().

  Since GDAL 2.3, the OSRFindMatches() function can also be used for improved matching by researching the EPSG catalog.

OGRSpatialReferenceH *`OSRFindMatches`(OGRSpatialReferenceH hSRS, char **papszOptions, int *pnEntries, int **ppanMatchConfidence)

  Try to identify a match between the passed SRS and a related SRS in a catalog.

  Matching may be partial, or may fail. Returned entries will be sorted by decreasing match confidence (first entry has the highest match confidence).

  The exact way matching is done may change in future versions. Starting with GDAL 3.0, it relies on PROJ’ proj_identify() function.

  This function is the same as OGRSpatialReference::FindMatches().

  Return

    an array of SRS that match the passed SRS, or NULL. Must be freed with OSRFreeSRSArray()

  Since

    GDAL 2.3

  Parameters

    - `hSRS`: SRS to match

    - `papszOptions`: NULL terminated list of options or NULL

    - `pnEntries`: Output parameter. Number of values in the returned array.

    - `ppanMatchConfidence`: Output parameter (or NULL). *ppanMatchConfidence will be allocated to an array of *pnEntries whose values between 0 and 100 indicate the confidence in the match. 100 is the highest confidence level. The array must be freed with CPLFree().

void `OSRFreeSRSArray`(OGRSpatialReferenceH *pahSRS)

  Free return of OSRIdentifyMatches()

  Since

    GDAL 2.3

  Parameters

    - `pahSRS`: array of SRS (must be NULL terminated)

int `OSREPSGTreatsAsLatLong`(OGRSpatialReferenceH hSRS)

  This function returns TRUE if EPSG feels this geographic coordinate system should be treated as having lat/long coordinate ordering.

  This function is the same as OGRSpatialReference::OSREPSGTreatsAsLatLong().

int `OSREPSGTreatsAsNorthingEasting`(OGRSpatialReferenceH hSRS)

  This function returns TRUE if EPSG feels this projected coordinate system should be treated as having northing/easting coordinate ordering.

  This function is the same as OGRSpatialReference::EPSGTreatsAsNorthingEasting().

  Since

    OGR 1.10.0

const char *`OSRGetAxis`(OGRSpatialReferenceH hSRS, const char *pszTargetKey, int iAxis, OGRAxisOrientation *peOrientation)

  Fetch the orientation of one axis.

  This method is the equivalent of the C++ method OGRSpatialReference::GetAxis

int `OSRGetAxesCount`(OGRSpatialReferenceH hSRS)

  Return the number of axis of the coordinate system of the CRS.

  This method is the equivalent of the C++ method OGRSpatialReference::GetAxesCount()

  Since

    GDAL 3.1

OGRErr `OSRSetAxes`(OGRSpatialReferenceH hSRS, const char *pszTargetKey, const char *pszXAxisName, OGRAxisOrientation eXAxisOrientation, const char *pszYAxisName, OGRAxisOrientation eYAxisOrientation)

  Set the axes for a coordinate system.

  This method is the equivalent of the C++ method OGRSpatialReference::SetAxes

OSRAxisMappingStrategy `OSRGetAxisMappingStrategy`(OGRSpatialReferenceH hSRS)

  Return the data axis to CRS axis mapping strategy.

  See OGRSpatialReference::GetAxisMappingStrategy()

  Since

    GDAL 3.0

void `OSRSetAxisMappingStrategy`(OGRSpatialReferenceH hSRS, OSRAxisMappingStrategy strategy)

  Set the data axis to CRS axis mapping strategy.

  See OGRSpatialReference::SetAxisMappingStrategy()

  Since

    GDAL 3.0

const int *`OSRGetDataAxisToSRSAxisMapping`(OGRSpatialReferenceH hSRS, int *pnCount)

  Return the data axis to SRS axis mapping.

  See OGRSpatialReference::GetDataAxisToSRSAxisMapping()

  Since

    GDAL 3.0

OGRErr `OSRSetDataAxisToSRSAxisMapping`(OGRSpatialReferenceH hSRS, int nMappingSize, const int *panMapping)

  Set a custom data axis to CRS axis mapping.

  s Automatically implies SetAxisMappingStrategy(OAMS_CUSTOM)

  See OGRSpatialReference::SetDataAxisToSRSAxisMapping()

  Since

    GDAL 3.1

OGRErr `OSRSetACEA`(OGRSpatialReferenceH hSRS, double dfStdP1, double dfStdP2, double dfCenterLat, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  Albers Conic Equal Area.

OGRErr `OSRSetAE`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  Azimuthal Equidistant.

OGRErr `OSRSetBonne`(OGRSpatialReferenceH hSRS, double dfStandardParallel, double dfCentralMeridian, double dfFalseEasting, double dfFalseNorthing)

  Bonne.

OGRErr `OSRSetCEA`(OGRSpatialReferenceH hSRS, double dfStdP1, double dfCentralMeridian, double dfFalseEasting, double dfFalseNorthing)

  Cylindrical Equal Area.

OGRErr `OSRSetCS`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  Cassini-Soldner.

OGRErr `OSRSetEC`(OGRSpatialReferenceH hSRS, double dfStdP1, double dfStdP2, double dfCenterLat, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  Equidistant Conic.

OGRErr `OSRSetEckert`(OGRSpatialReferenceH hSRS, int nVariation, double dfCentralMeridian, double dfFalseEasting, double dfFalseNorthing)

  Eckert I-VI.

OGRErr `OSRSetEckertIV`(OGRSpatialReferenceH hSRS, double dfCentralMeridian, double dfFalseEasting, double dfFalseNorthing)

  Eckert IV.

OGRErr `OSRSetEckertVI`(OGRSpatialReferenceH hSRS, double dfCentralMeridian, double dfFalseEasting, double dfFalseNorthing)

  Eckert VI.

OGRErr `OSRSetEquirectangular`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  Equirectangular.

OGRErr `OSRSetEquirectangular2`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfPseudoStdParallel1, double dfFalseEasting, double dfFalseNorthing)

  Equirectangular generalized form.

OGRErr `OSRSetGS`(OGRSpatialReferenceH hSRS, double dfCentralMeridian, double dfFalseEasting, double dfFalseNorthing)

  Gall Stereograpic.

OGRErr `OSRSetGH`(OGRSpatialReferenceH hSRS, double dfCentralMeridian, double dfFalseEasting, double dfFalseNorthing)

  Goode Homolosine.

OGRErr `OSRSetIGH`(OGRSpatialReferenceH hSRS)

  Interrupted Goode Homolosine.

OGRErr `OSRSetGEOS`(OGRSpatialReferenceH hSRS, double dfCentralMeridian, double dfSatelliteHeight, double dfFalseEasting, double dfFalseNorthing)

  GEOS - Geostationary Satellite View.

OGRErr `OSRSetGaussSchreiberTMercator`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfScale, double dfFalseEasting, double dfFalseNorthing)

  Gauss Schreiber Transverse Mercator.

OGRErr `OSRSetGnomonic`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  Gnomonic.

OGRErr `OSRSetHOM`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfAzimuth, double dfRectToSkew, double dfScale, double dfFalseEasting, double dfFalseNorthing)

  Hotine Oblique Mercator using azimuth angle.

  Hotine Oblique Mercator using azimuth angle.

  This is the same as the C++ method OGRSpatialReference::SetHOM()

OGRErr `OSRSetHOMAC`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfAzimuth, double dfRectToSkew, double dfScale, double dfFalseEasting, double dfFalseNorthing)

  Set an Oblique Mercator projection using azimuth angle.

  This is the same as the C++ method OGRSpatialReference::SetHOMAC()

OGRErr `OSRSetHOM2PNO`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfLat1, double dfLong1, double dfLat2, double dfLong2, double dfScale, double dfFalseEasting, double dfFalseNorthing)

  Hotine Oblique Mercator using two points on centerline.

  Hotine Oblique Mercator using two points on centerline.

  This is the same as the C++ method OGRSpatialReference::SetHOM2PNO()

OGRErr `OSRSetIWMPolyconic`(OGRSpatialReferenceH hSRS, double dfLat1, double dfLat2, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  International Map of the World Polyconic.

OGRErr `OSRSetKrovak`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfAzimuth, double dfPseudoStdParallelLat, double dfScale, double dfFalseEasting, double dfFalseNorthing)

  Krovak Oblique Conic Conformal.

OGRErr `OSRSetLAEA`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  Lambert Azimuthal Equal-Area.

OGRErr `OSRSetLCC`(OGRSpatialReferenceH hSRS, double dfStdP1, double dfStdP2, double dfCenterLat, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  Lambert Conformal Conic.

OGRErr `OSRSetLCC1SP`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfScale, double dfFalseEasting, double dfFalseNorthing)

  Lambert Conformal Conic 1SP.

OGRErr `OSRSetLCCB`(OGRSpatialReferenceH hSRS, double dfStdP1, double dfStdP2, double dfCenterLat, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  Lambert Conformal Conic (Belgium)

OGRErr `OSRSetMC`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  Miller Cylindrical.

OGRErr `OSRSetMercator`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfScale, double dfFalseEasting, double dfFalseNorthing)

  Mercator.

OGRErr `OSRSetMercator2SP`(OGRSpatialReferenceH hSRS, double dfStdP1, double dfCenterLat, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  Mercator 2SP.

OGRErr `OSRSetMollweide`(OGRSpatialReferenceH hSRS, double dfCentralMeridian, double dfFalseEasting, double dfFalseNorthing)

  Mollweide.

OGRErr `OSRSetNZMG`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  New Zealand Map Grid.

OGRErr `OSRSetOS`(OGRSpatialReferenceH hSRS, double dfOriginLat, double dfCMeridian, double dfScale, double dfFalseEasting, double dfFalseNorthing)

  Oblique Stereographic.

OGRErr `OSRSetOrthographic`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  Orthographic.

OGRErr `OSRSetPolyconic`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  Polyconic.

OGRErr `OSRSetPS`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfScale, double dfFalseEasting, double dfFalseNorthing)

  Polar Stereographic.

OGRErr `OSRSetRobinson`(OGRSpatialReferenceH hSRS, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  Robinson.

OGRErr `OSRSetSinusoidal`(OGRSpatialReferenceH hSRS, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  Sinusoidal.

OGRErr `OSRSetStereographic`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfScale, double dfFalseEasting, double dfFalseNorthing)

  Stereographic.

OGRErr `OSRSetSOC`(OGRSpatialReferenceH hSRS, double dfLatitudeOfOrigin, double dfCentralMeridian, double dfFalseEasting, double dfFalseNorthing)

  Swiss Oblique Cylindrical.

OGRErr `OSRSetTM`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfScale, double dfFalseEasting, double dfFalseNorthing)

  Transverse Mercator.

  Special processing available for Transverse Mercator with GDAL >= 1.10 and PROJ >= 4.8 : see OGRSpatialReference::exportToProj4().

OGRErr `OSRSetTMVariant`(OGRSpatialReferenceH hSRS, const char *pszVariantName, double dfCenterLat, double dfCenterLong, double dfScale, double dfFalseEasting, double dfFalseNorthing)

  Transverse Mercator variant.

OGRErr `OSRSetTMG`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  Tunesia Mining Grid.

OGRErr `OSRSetTMSO`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong, double dfScale, double dfFalseEasting, double dfFalseNorthing)

  Transverse Mercator (South Oriented)

OGRErr `OSRSetTPED`(OGRSpatialReferenceH hSRS, double dfLat1, double dfLong1, double dfLat2, double dfLong2, double dfFalseEasting, double dfFalseNorthing)

  TPED (Two Point Equi Distant)

OGRErr `OSRSetVDG`(OGRSpatialReferenceH hSRS, double dfCenterLong, double dfFalseEasting, double dfFalseNorthing)

  VanDerGrinten.

OGRErr `OSRSetWagner`(OGRSpatialReferenceH hSRS, int nVariation, double dfCenterLat, double dfFalseEasting, double dfFalseNorthing)

  Wagner I VII.

OGRErr `OSRSetQSC`(OGRSpatialReferenceH hSRS, double dfCenterLat, double dfCenterLong)

  Quadrilateralized Spherical Cube.

OGRErr `OSRSetSCH`(OGRSpatialReferenceH hSRS, double dfPegLat, double dfPegLong, double dfPegHeading, double dfPegHgt)

  Spherical, Cross-track, Height.

OGRErr `OSRSetVerticalPerspective`(OGRSpatialReferenceH hSRS, double dfTopoOriginLat, double dfTopoOriginLon, double dfTopoOriginHeight, double dfViewPointHeight, double dfFalseEasting, double dfFalseNorthing)

  Vertical Perspective / Near-sided Perspective.

double `OSRCalcInvFlattening`(double dfSemiMajor, double dfSemiMinor)

  Compute inverse flattening from semi-major and semi-minor axis.

  Return

    inverse flattening, or 0 if both axis are equal.

  Since

    GDAL 2.0

  Parameters

    - `dfSemiMajor`: Semi-major axis length.

    - `dfSemiMinor`: Semi-minor axis length.

double `OSRCalcSemiMinorFromInvFlattening`(double dfSemiMajor, double dfInvFlattening)

  Compute semi-minor axis from semi-major axis and inverse flattening.

  Return

    semi-minor axis

  Since

    GDAL 2.0

  Parameters

    - `dfSemiMajor`: Semi-major axis length.

    - `dfInvFlattening`: Inverse flattening or 0 for sphere.

void `OSRCleanup`(void)

  Cleanup cached SRS related memory.

  This function will attempt to cleanup any cache spatial reference related information, such as cached tables of coordinate systems.

OSRCRSInfo **`OSRGetCRSInfoListFromDatabase`(const char *pszAuthName, const OSRCRSListParameters *params, int *pnOutResultCount)

  Enumerate CRS objects from the database.

  The returned object is an array of OSRCRSInfo* pointers, whose last entry is NULL. This array should be freed with OSRDestroyCRSInfoList()

  Return

    an array of OSRCRSInfo* pointers to be freed with OSRDestroyCRSInfoList(), or NULL in case of error.

  Since

    GDAL 3.0

  Parameters

    - `pszAuthName`: Authority name, used to restrict the search. Or NULL for all authorities.

    - `params`: Additional criteria. Must be set to NULL for now.

    - `pnOutResultCount`: Output parameter pointing to an integer to receive the size of the result list. Might be NULL

void `OSRDestroyCRSInfoList`(OSRCRSInfo **list)

  Destroy the result returned by OSRGetCRSInfoListFromDatabase().

  Since

    GDAL 3.0

OGRCoordinateTransformationH `OCTNewCoordinateTransformation`(OGRSpatialReferenceH hSourceSRS, OGRSpatialReferenceH hTargetSRS)

  Create transformation object.

  This is the same as the C++ function OGRCreateCoordinateTransformation(const OGRSpatialReference *, const OGRSpatialReference *)

  Input spatial reference system objects are assigned by copy (calling clone() method) and no ownership transfer occurs.

  OCTDestroyCoordinateTransformation() should be used to destroy transformation objects.

  This will honour the axis order advertized by the source and target SRS, as well as their “data axis to SRS axis mapping”. To have a behavior similar to GDAL < 3.0, the OGR_CT_FORCE_TRADITIONAL_GIS_ORDER configuration option can be set to YES.

  Return

    NULL on failure or a ready to use transformation object.

  Parameters

    - `hSourceSRS`: source spatial reference system.

    - `hTargetSRS`: target spatial reference system.

OGRCoordinateTransformationOptionsH `OCTNewCoordinateTransformationOptions`(void)

  Create coordinate transformation options.

  To be freed with OCTDestroyCoordinateTransformationOptions()

  Since

    GDAL 3.0

int `OCTCoordinateTransformationOptionsSetOperation`(OGRCoordinateTransformationOptionsH hOptions, const char *pszCO, int bReverseCO)

  Sets a coordinate operation.

  See OGRCoordinateTransformationOptions::SetCoordinateTransformation()

  Since

    GDAL 3.0

int `OCTCoordinateTransformationOptionsSetAreaOfInterest`(OGRCoordinateTransformationOptionsH hOptions, double dfWestLongitudeDeg, double dfSouthLatitudeDeg, double dfEastLongitudeDeg, double dfNorthLatitudeDeg)

  Sets an area of interest.

  See OGRCoordinateTransformationOptions::SetAreaOfInterest()

  Since

    GDAL 3.0

void `OCTDestroyCoordinateTransformationOptions`(OGRCoordinateTransformationOptionsH hOptions)

  Destroy coordinate transformation options.

  Since

    GDAL 3.0

OGRCoordinateTransformationH `OCTNewCoordinateTransformationEx`(OGRSpatialReferenceH hSourceSRS, OGRSpatialReferenceH hTargetSRS, OGRCoordinateTransformationOptionsH hOptions)

  Create transformation object.

  This is the same as the C++ function OGRCreateCoordinateTransformation(const OGRSpatialReference *, const OGRSpatialReference *, const OGRCoordinateTransformationOptions& )

  Input spatial reference system objects are assigned by copy (calling clone() method) and no ownership transfer occurs.

  OCTDestroyCoordinateTransformation() should be used to destroy transformation objects.

  The source SRS and target SRS should generally not be NULL. This is only allowed if a custom coordinate operation is set through the hOptions argument.

  This will honour the axis order advertized by the source and target SRS, as well as their “data axis to SRS axis mapping”. To have a behavior similar to GDAL < 3.0, the OGR_CT_FORCE_TRADITIONAL_GIS_ORDER configuration option can be set to YES.

  If options contains a user defined coordinate transformation pipeline, it will be unconditionally used. If options has an area of interest defined, it will be used to research the best fitting coordinate transformation (which will be used for all coordinate transformations, even if they don’t fall into the declared area of interest) If no options are set, then a list of candidate coordinate operations will be reseached, and at each call to Transform(), the best of those candidate regarding the centroid of the coordinate set will be dynamically selected.

  Return

    NULL on failure or a ready to use transformation object.

  Since

    GDAL 3.0

  Parameters

    - `hSourceSRS`: source spatial reference system.

    - `hTargetSRS`: target spatial reference system.

    - `hOptions`: Coordinate transformation options.

void `OCTDestroyCoordinateTransformation`(OGRCoordinateTransformationH hCT)

  OGRCoordinateTransformation destructor.

  This function is the same as OGRCoordinateTransformation::DestroyCT()

  Parameters

    - `hCT`: the object to delete

int `OCTTransform`(OGRCoordinateTransformationH hCT, int nCount, double *x, double *y, double *z)

  Transform an array of points.

  Return

    TRUE or FALSE

  Parameters

    - `hTransform`: Transformation object

    - `nCount`: Number of points

    - `x`: Array of nCount x values.

    - `y`: Array of nCount y values.

    - `z`: Array of nCount z values.

int `OCTTransformEx`(OGRCoordinateTransformationH hCT, int nCount, double *x, double *y, double *z, int *pabSuccess)

  Transform an array of points.

  Return

    TRUE or FALSE

  Parameters

    - `hTransform`: Transformation object

    - `nCount`: Number of points

    - `x`: Array of nCount x values.

    - `y`: Array of nCount y values.

    - `z`: Array of nCount z values.

    - `pabSuccess`: Output array of nCount value that will be set to TRUE/FALSE

int `OCTTransform4D`(OGRCoordinateTransformationH hCT, int nCount, double *x, double *y, double *z, double *t, int *pabSuccess)

  Transform an array of points.

  Since

    GDAL 3.0

  Return

    TRUE or FALSE

  Parameters

    - `hTransform`: Transformation object

    - `nCount`: Number of points

    - `x`: Array of nCount x values. Should not be NULL

    - `y`: Array of nCount y values. Should not be NULL

    - `z`: Array of nCount z values. Might be NULL

    - `t`: Array of nCount time values. Might be NULL

    - `pabSuccess`: Output array of nCount value that will be set to TRUE/FALSE. Might be NULL.

struct `OSRCRSInfo`
  #include <ogr_srs_api.h>

  Structure given overall description of a CRS.

  This structure may grow over time, and should not be directly allocated by client code.

  Public Members

  char *`pszAuthName`

    Authority name.

  char *`pszCode`

    Object code.

  char *`pszName`

    Object name.

  OSRCRSType `eType`

    Object type.

  int `bDeprecated`

    Whether the object is deprecated.

  int `bBboxValid`

    Whereas the west_lon_degree, south_lat_degree, east_lon_degree and north_lat_degree fields are valid.

  double `dfWestLongitudeDeg`

    Western-most longitude of the area of use, in degrees.

  double `dfSouthLatitudeDeg`

    Southern-most latitude of the area of use, in degrees.

  double `dfEastLongitudeDeg`

    Eastern-most longitude of the area of use, in degrees.

  double `dfNorthLatitudeDeg`

    Northern-most latitude of the area of use, in degrees.

  char *`pszAreaName`

    Name of the area of use.

  char *`pszProjectionMethod`

    Name of the projection method for a projected CRS.

    Might be NULL even for projected CRS in some cases.