GDAL
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OGRGeometry Class Referenceabstract

Abstract base class for all geometry classes. More...

#include <ogr_geometry.h>

Inheritance diagram for OGRGeometry:
OGRCurve OGRGeometryCollection OGRPoint OGRSurface OGRCompoundCurve OGRSimpleCurve OGRMultiCurve OGRMultiPoint OGRMultiSurface OGRIteratedPoint OGRCurvePolygon OGRPolyhedralSurface

Public Member Functions

 OGRGeometry (const OGRGeometry &other)
 Copy constructor.
 
OGRGeometryoperator= (const OGRGeometry &other)
 Assignment operator.
 
bool operator== (const OGRGeometry &other) const
 Returns if two geometries are equal.
 
bool operator!= (const OGRGeometry &other) const
 Returns if two geometries are different.
 
virtual int getDimension () const =0
 Get the dimension of this object.
 
virtual int getCoordinateDimension () const
 Get the dimension of the coordinates in this object.
 
int CoordinateDimension () const
 Get the dimension of the coordinates in this object.
 
virtual OGRBoolean IsEmpty () const =0
 Returns TRUE (non-zero) if the object has no points.
 
virtual OGRBoolean IsValid () const
 Test if the geometry is valid.
 
virtual OGRGeometryMakeValid (CSLConstList papszOptions=nullptr) const
 Attempts to make an invalid geometry valid without losing vertices.
 
virtual OGRGeometryNormalize () const
 Attempts to bring geometry into normalized/canonical form.
 
virtual OGRBoolean IsSimple () const
 Test if the geometry is simple.
 
OGRBoolean Is3D () const
 
OGRBoolean IsMeasured () const
 
virtual OGRBoolean IsRing () const
 Test if the geometry is a ring.
 
virtual void empty ()=0
 Clear geometry information.
 
virtual OGRGeometryclone () const =0
 Make a copy of this object.
 
virtual void getEnvelope (OGREnvelope *psEnvelope) const =0
 Computes and returns the bounding envelope for this geometry in the passed psEnvelope structure.
 
virtual void getEnvelope (OGREnvelope3D *psEnvelope) const =0
 Computes and returns the bounding envelope (3D) for this geometry in the passed psEnvelope structure.
 
virtual size_t WkbSize () const =0
 Returns size of related binary representation.
 
OGRErr importFromWkb (const GByte *, size_t=static_cast< size_t >(-1), OGRwkbVariant=wkbVariantOldOgc)
 Assign geometry from well known binary data.
 
virtual OGRErr importFromWkb (const unsigned char *, size_t, OGRwkbVariant, size_t &nBytesConsumedOut)=0
 Assign geometry from well known binary data.
 
OGRErr exportToWkb (OGRwkbByteOrder, unsigned char *, OGRwkbVariant=wkbVariantOldOgc) const
 Convert a geometry into well known binary format.
 
virtual OGRErr exportToWkb (unsigned char *, const OGRwkbExportOptions *=nullptr) const =0
 Convert a geometry into well known binary format.
 
virtual OGRErr importFromWkt (const char **ppszInput)=0
 Assign geometry from well known text data.
 
OGRErr importFromWkt (char **ppszInput)
 Deprecated.
 
OGRErr exportToWkt (char **ppszDstText, OGRwkbVariant=wkbVariantOldOgc) const
 Convert a geometry into well known text format.
 
virtual std::string exportToWkt (const OGRWktOptions &opts=OGRWktOptions(), OGRErr *err=nullptr) const =0
 Export a WKT geometry.
 
virtual OGRwkbGeometryType getGeometryType () const =0
 Fetch geometry type.
 
OGRwkbGeometryType getIsoGeometryType () const
 Get the geometry type that conforms with ISO SQL/MM Part3.
 
virtual const char * getGeometryName () const =0
 Fetch WKT name for geometry type.
 
void dumpReadable (FILE *, const char *=nullptr, CSLConstList papszOptions=nullptr) const
 Dump geometry in well known text format to indicated output file.
 
std::string dumpReadable (const char *=nullptr, CSLConstList papszOptions=nullptr) const
 Dump geometry in well known text format to indicated output file.
 
virtual void flattenTo2D ()=0
 Convert geometry to strictly 2D.
 
virtual char * exportToGML (const char *const *papszOptions=nullptr) const
 Convert a geometry into GML format.
 
virtual char * exportToKML () const
 Convert a geometry into KML format.
 
virtual char * exportToJson (CSLConstList papszOptions=nullptr) const
 Convert a geometry into GeoJSON format.
 
virtual void accept (IOGRGeometryVisitor *visitor)=0
 Accept a visitor.
 
virtual void accept (IOGRConstGeometryVisitor *visitor) const =0
 Accept a visitor.
 
GEOSGeom exportToGEOS (GEOSContextHandle_t hGEOSCtxt, bool bRemoveEmptyParts=false) const
 Returns a GEOSGeom object corresponding to the geometry.
 
virtual OGRBoolean hasCurveGeometry (int bLookForNonLinear=FALSE) const
 Returns if this geometry is or has curve geometry.
 
virtual OGRGeometrygetCurveGeometry (const char *const *papszOptions=nullptr) const
 Return curve version of this geometry.
 
virtual OGRGeometrygetLinearGeometry (double dfMaxAngleStepSizeDegrees=0, const char *const *papszOptions=nullptr) const
 Return, possibly approximate, non-curve version of this geometry.
 
void roundCoordinates (const OGRGeomCoordinatePrecision &sPrecision)
 Round coordinates of the geometry to the specified precision.
 
void roundCoordinatesIEEE754 (const OGRGeomCoordinateBinaryPrecision &options)
 Round coordinates of a geometry, exploiting characteristics of the IEEE-754 double-precision binary representation.
 
virtual void closeRings ()
 Force rings to be closed.
 
virtual bool setCoordinateDimension (int nDimension)
 Set the coordinate dimension.
 
virtual bool set3D (OGRBoolean bIs3D)
 Add or remove the Z coordinate dimension.
 
virtual bool setMeasured (OGRBoolean bIsMeasured)
 Add or remove the M coordinate dimension.
 
virtual void assignSpatialReference (const OGRSpatialReference *poSR)
 Assign spatial reference to this object.
 
const OGRSpatialReferencegetSpatialReference (void) const
 Returns spatial reference system for object.
 
virtual OGRErr transform (OGRCoordinateTransformation *poCT)=0
 Apply arbitrary coordinate transformation to geometry.
 
OGRErr transformTo (const OGRSpatialReference *poSR)
 Transform geometry to new spatial reference system.
 
virtual bool segmentize (double dfMaxLength)
 Modify the geometry such it has no segment longer then the given distance.
 
virtual OGRBoolean Intersects (const OGRGeometry *) const
 Do these features intersect?
 
virtual OGRBoolean Equals (const OGRGeometry *) const =0
 Returns TRUE if two geometries are equivalent.
 
virtual OGRBoolean Disjoint (const OGRGeometry *) const
 Test for disjointness.
 
virtual OGRBoolean Touches (const OGRGeometry *) const
 Test for touching.
 
virtual OGRBoolean Crosses (const OGRGeometry *) const
 Test for crossing.
 
virtual OGRBoolean Within (const OGRGeometry *) const
 Test for containment.
 
virtual OGRBoolean Contains (const OGRGeometry *) const
 Test for containment.
 
virtual OGRBoolean Overlaps (const OGRGeometry *) const
 Test for overlap.
 
virtual OGRGeometryBoundary () const
 Compute boundary.
 
virtual double Distance (const OGRGeometry *) const
 Compute distance between two geometries.
 
virtual OGRGeometryConvexHull () const
 Compute convex hull.
 
virtual OGRGeometryConcaveHull (double dfRatio, bool bAllowHoles) const
 Compute "concave hull" of a geometry.
 
virtual OGRGeometryBuffer (double dfDist, int nQuadSegs=30) const
 Compute buffer of geometry.
 
virtual OGRGeometryBufferEx (double dfDistance, CSLConstList papszOptions) const
 Compute buffer of geometry.
 
virtual OGRGeometryIntersection (const OGRGeometry *) const
 Compute intersection.
 
virtual OGRGeometryUnion (const OGRGeometry *) const
 Compute union.
 
virtual OGRGeometryUnionCascaded () const
 Compute union using cascading.
 
OGRGeometryUnaryUnion () const
 Returns the union of all components of a single geometry.
 
virtual OGRGeometryDifference (const OGRGeometry *) const
 Compute difference.
 
virtual OGRGeometrySymDifference (const OGRGeometry *) const
 Compute symmetric difference.
 
virtual OGRErr Centroid (OGRPoint *poPoint) const
 Compute the geometry centroid.
 
virtual OGRGeometrySimplify (double dTolerance) const
 Simplify the geometry.
 
OGRGeometrySimplifyPreserveTopology (double dTolerance) const
 Simplify the geometry while preserving topology.
 
virtual OGRGeometryDelaunayTriangulation (double dfTolerance, int bOnlyEdges) const
 Return a Delaunay triangulation of the vertices of the geometry.
 
virtual OGRGeometryPolygonize () const
 Polygonizes a set of sparse edges.
 
virtual double Distance3D (const OGRGeometry *poOtherGeom) const
 Returns the 3D distance between two geometries.
 
OGRGeometrySetPrecision (double dfGridSize, int nFlags) const
 Set the geometry's precision, rounding all its coordinates to the precision grid, and making sure the geometry is still valid.
 
virtual bool hasEmptyParts () const
 Returns whether a geometry has empty parts/rings.
 
virtual void removeEmptyParts ()
 Remove empty parts/rings from this geometry.
 
virtual void swapXY ()
 Swap x and y coordinates.
 
bool IsRectangle () const
 Returns whether the geometry is a polygon with 4 corners forming a rectangle.
 
OGRPointtoPoint ()
 Down-cast to OGRPoint*.
 
const OGRPointtoPoint () const
 Down-cast to OGRPoint*.
 
OGRCurvetoCurve ()
 Down-cast to OGRCurve*.
 
const OGRCurvetoCurve () const
 Down-cast to OGRCurve*.
 
OGRSimpleCurvetoSimpleCurve ()
 Down-cast to OGRSimpleCurve*.
 
const OGRSimpleCurvetoSimpleCurve () const
 Down-cast to OGRSimpleCurve*.
 
OGRLineStringtoLineString ()
 Down-cast to OGRLineString*.
 
const OGRLineStringtoLineString () const
 Down-cast to OGRLineString*.
 
OGRLinearRingtoLinearRing ()
 Down-cast to OGRLinearRing*.
 
const OGRLinearRingtoLinearRing () const
 Down-cast to OGRLinearRing*.
 
OGRCircularStringtoCircularString ()
 Down-cast to OGRCircularString*.
 
const OGRCircularStringtoCircularString () const
 Down-cast to OGRCircularString*.
 
OGRCompoundCurvetoCompoundCurve ()
 Down-cast to OGRCompoundCurve*.
 
const OGRCompoundCurvetoCompoundCurve () const
 Down-cast to OGRCompoundCurve*.
 
OGRSurfacetoSurface ()
 Down-cast to OGRSurface*.
 
const OGRSurfacetoSurface () const
 Down-cast to OGRSurface*.
 
OGRPolygontoPolygon ()
 Down-cast to OGRPolygon*.
 
const OGRPolygontoPolygon () const
 Down-cast to OGRPolygon*.
 
OGRTriangletoTriangle ()
 Down-cast to OGRTriangle*.
 
const OGRTriangletoTriangle () const
 Down-cast to OGRTriangle*.
 
OGRCurvePolygontoCurvePolygon ()
 Down-cast to OGRCurvePolygon*.
 
const OGRCurvePolygontoCurvePolygon () const
 Down-cast to OGRCurvePolygon*.
 
OGRGeometryCollectiontoGeometryCollection ()
 Down-cast to OGRGeometryCollection*.
 
const OGRGeometryCollectiontoGeometryCollection () const
 Down-cast to OGRGeometryCollection*.
 
OGRMultiPointtoMultiPoint ()
 Down-cast to OGRMultiPoint*.
 
const OGRMultiPointtoMultiPoint () const
 Down-cast to OGRMultiPoint*.
 
OGRMultiLineStringtoMultiLineString ()
 Down-cast to OGRMultiLineString*.
 
const OGRMultiLineStringtoMultiLineString () const
 Down-cast to OGRMultiLineString*.
 
OGRMultiPolygontoMultiPolygon ()
 Down-cast to OGRMultiPolygon*.
 
const OGRMultiPolygontoMultiPolygon () const
 Down-cast to OGRMultiPolygon*.
 
OGRMultiCurvetoMultiCurve ()
 Down-cast to OGRMultiCurve*.
 
const OGRMultiCurvetoMultiCurve () const
 Down-cast to OGRMultiCurve*.
 
OGRMultiSurfacetoMultiSurface ()
 Down-cast to OGRMultiSurface*.
 
const OGRMultiSurfacetoMultiSurface () const
 Down-cast to OGRMultiSurface*.
 
OGRPolyhedralSurfacetoPolyhedralSurface ()
 Down-cast to OGRPolyhedralSurface*.
 
const OGRPolyhedralSurfacetoPolyhedralSurface () const
 Down-cast to OGRPolyhedralSurface*.
 
OGRTriangulatedSurfacetoTriangulatedSurface ()
 Down-cast to OGRTriangulatedSurface*.
 
const OGRTriangulatedSurfacetoTriangulatedSurface () const
 Down-cast to OGRTriangulatedSurface*.
 

Static Public Member Functions

static GEOSContextHandle_t createGEOSContext ()
 Create a new GEOS context.
 
static void freeGEOSContext (GEOSContextHandle_t hGEOSCtxt)
 Destroy a GEOS context.
 
static OGRGeometryH ToHandle (OGRGeometry *poGeom)
 Convert a OGRGeometry* to a OGRGeometryH.
 
static OGRGeometryFromHandle (OGRGeometryH hGeom)
 Convert a OGRGeometryH to a OGRGeometry*.
 

Detailed Description

Abstract base class for all geometry classes.

Some spatial analysis methods require that OGR is built on the GEOS library to work properly. The precise meaning of methods that describe spatial relationships between geometries is described in the SFCOM, or other simple features interface specifications, like "OpenGIS® Implementation Specification for Geographic information - Simple feature access - Part 1: Common architecture": OGC 06-103r4

In GDAL 2.0, the hierarchy of classes has been extended with (working draft) ISO SQL/MM Part 3 (ISO/IEC 13249-3) curve geometries : CIRCULARSTRING (OGRCircularString), COMPOUNDCURVE (OGRCompoundCurve), CURVEPOLYGON (OGRCurvePolygon), MULTICURVE (OGRMultiCurve) and MULTISURFACE (OGRMultiSurface).

Constructor & Destructor Documentation

◆ OGRGeometry()

OGRGeometry::OGRGeometry ( const OGRGeometry other)

Copy constructor.

Note: before GDAL 2.1, only the default implementation of the constructor existed, which could be unsafe to use.

Since
GDAL 2.1

Member Function Documentation

◆ accept() [1/2]

virtual void OGRGeometry::accept ( IOGRConstGeometryVisitor visitor) const
pure virtual

◆ accept() [2/2]

virtual void OGRGeometry::accept ( IOGRGeometryVisitor visitor)
pure virtual

◆ assignSpatialReference()

void OGRGeometry::assignSpatialReference ( const OGRSpatialReference poSR)
virtual

Assign spatial reference to this object.

Any existing spatial reference is replaced, but under no circumstances does this result in the object being reprojected. It is just changing the interpretation of the existing geometry. Note that assigning a spatial reference increments the reference count on the OGRSpatialReference, but does not copy it.

Starting with GDAL 2.3, this will also assign the spatial reference to potential sub-geometries of the geometry (OGRGeometryCollection, OGRCurvePolygon/OGRPolygon, OGRCompoundCurve, OGRPolyhedralSurface and their derived classes).

This is similar to the SFCOM IGeometry::put_SpatialReference() method.

This method is the same as the C function OGR_G_AssignSpatialReference().

Parameters
poSRnew spatial reference system to apply.

Reimplemented in OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.

◆ Boundary()

OGRGeometry * OGRGeometry::Boundary ( ) const
virtual

Compute boundary.

A new geometry object is created and returned containing the boundary of the geometry on which the method is invoked.

This method is the same as the C function OGR_G_Boundary().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Returns
a new geometry to be freed by the caller, or NULL if an error occurs.
Since
OGR 1.8.0

◆ Buffer()

OGRGeometry * OGRGeometry::Buffer ( double  dfDist,
int  nQuadSegs = 30 
) const
virtual

Compute buffer of geometry.

Builds a new geometry containing the buffer region around the geometry on which it is invoked. The buffer is a polygon containing the region within the buffer distance of the original geometry.

Some buffer sections are properly described as curves, but are converted to approximate polygons. The nQuadSegs parameter can be used to control how many segments should be used to define a 90 degree curve - a quadrant of a circle. A value of 30 is a reasonable default. Large values result in large numbers of vertices in the resulting buffer geometry while small numbers reduce the accuracy of the result.

This method is the same as the C function OGR_G_Buffer().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Parameters
dfDistthe buffer distance to be applied. Should be expressed into the same unit as the coordinates of the geometry.
nQuadSegsthe number of segments used to approximate a 90 degree (quadrant) of curvature.
Returns
a new geometry to be freed by the caller, or NULL if an error occurs.

◆ BufferEx()

OGRGeometry * OGRGeometry::BufferEx ( double  dfDist,
CSLConstList  papszOptions 
) const
virtual

Compute buffer of geometry.

Builds a new geometry containing the buffer region around the geometry on which it is invoked. The buffer is a polygon containing the region within the buffer distance of the original geometry.

This function is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this function will always fail, issuing a CPLE_NotSupported error.

The following options are supported. See the GEOS library for more detailed descriptions.

  • ENDCAP_STYLE=ROUND/FLAT/SQUARE
  • JOIN_STYLE=ROUND/MITRE/BEVEL
  • MITRE_LIMIT=double
  • QUADRANT_SEGMENTS=double
  • SINGLE_SIDED=YES/NO

This function is the same as the C function OGR_G_BufferEx().

Parameters
dfDistthe buffer distance to be applied. Should be expressed into the same unit as the coordinates of the geometry.
papszOptionsNULL terminated list of options (may be NULL)
Returns
a new geometry to be freed by the caller, or NULL if an error occurs.
Since
GDAL 3.10

◆ Centroid()

OGRErr OGRGeometry::Centroid ( OGRPoint poPoint) const
virtual

Compute the geometry centroid.

The centroid location is applied to the passed in OGRPoint object. The centroid is not necessarily within the geometry.

This method relates to the SFCOM ISurface::get_Centroid() method however the current implementation based on GEOS can operate on other geometry types such as multipoint, linestring, geometrycollection such as multipolygons. OGC SF SQL 1.1 defines the operation for surfaces (polygons). SQL/MM-Part 3 defines the operation for surfaces and multisurfaces (multipolygons).

This function is the same as the C function OGR_G_Centroid().

This function is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this function will always fail, issuing a CPLE_NotSupported error.

Returns
OGRERR_NONE on success or OGRERR_FAILURE on error.
Since
OGR 1.8.0 as a OGRGeometry method (previously was restricted to OGRPolygon)

◆ clone()

OGRGeometry * OGRGeometry::clone ( ) const
pure virtual

Make a copy of this object.

This method relates to the SFCOM IGeometry::clone() method.

This method is the same as the C function OGR_G_Clone().

Returns
a new object instance with the same geometry, and spatial reference system as the original.

Implemented in OGRPoint, OGRLineString, OGRLinearRing, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRTriangle, OGRGeometryCollection, OGRMultiSurface, OGRMultiPolygon, OGRPolyhedralSurface, OGRTriangulatedSurface, OGRMultiPoint, OGRMultiCurve, OGRMultiLineString, OGRCurve, OGRSimpleCurve, and OGRSurface.

◆ closeRings()

void OGRGeometry::closeRings ( )
virtual

Force rings to be closed.

If this geometry, or any contained geometries has polygon rings that are not closed, they will be closed by adding the starting point at the end.

Reimplemented in OGRLinearRing, OGRPolygon, and OGRGeometryCollection.

◆ ConcaveHull()

OGRGeometry * OGRGeometry::ConcaveHull ( double  dfRatio,
bool  bAllowHoles 
) const
virtual

Compute "concave hull" of a geometry.

The concave hull is fully contained within the convex hull and also contains all the points of the input, but in a smaller area. The area ratio is the ratio of the area of the convex hull and the concave hull. Frequently used to convert a multi-point into a polygonal area. that contains all the points in the input Geometry.

A new geometry object is created and returned containing the concave hull of the geometry on which the method is invoked.

This method is the same as the C function OGR_G_ConcaveHull().

This method is built on the GEOS >= 3.11 library If OGR is built without the GEOS >= 3.11 librray, this method will always fail, issuing a CPLE_NotSupported error.

Parameters
dfRatioRatio of the area of the convex hull and the concave hull.
bAllowHolesWhether holes are allowed.
Returns
a new geometry to be freed by the caller, or NULL if an error occurs.
Since
GDAL 3.6

◆ Contains()

OGRBoolean OGRGeometry::Contains ( const OGRGeometry poOtherGeom) const
virtual

Test for containment.

Tests if actual geometry object contains the passed geometry.

Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.

This method is the same as the C function OGR_G_Contains().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Parameters
poOtherGeomthe geometry to compare to this geometry.
Returns
TRUE if poOtherGeom contains this geometry, otherwise FALSE.

Reimplemented in OGRCurvePolygon.

◆ ConvexHull()

OGRGeometry * OGRGeometry::ConvexHull ( ) const
virtual

Compute convex hull.

A new geometry object is created and returned containing the convex hull of the geometry on which the method is invoked.

This method is the same as the C function OGR_G_ConvexHull().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Returns
a new geometry to be freed by the caller, or NULL if an error occurs.

◆ CoordinateDimension()

int OGRGeometry::CoordinateDimension ( ) const

Get the dimension of the coordinates in this object.

This method is the same as the C function OGR_G_CoordinateDimension().

Returns
this will return 2 for XY, 3 for XYZ and XYM, and 4 for XYZM data.
Since
GDAL 2.1

◆ createGEOSContext()

GEOSContextHandle_t OGRGeometry::createGEOSContext ( )
static

Create a new GEOS context.

Returns
a new GEOS context (to be freed with freeGEOSContext())

◆ Crosses()

OGRBoolean OGRGeometry::Crosses ( const OGRGeometry poOtherGeom) const
virtual

Test for crossing.

Tests if this geometry and the other passed into the method are crossing.

Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.

This method is the same as the C function OGR_G_Crosses().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Parameters
poOtherGeomthe geometry to compare to this geometry.
Returns
TRUE if they are crossing, otherwise FALSE.

◆ DelaunayTriangulation()

OGRGeometry * OGRGeometry::DelaunayTriangulation ( double  dfTolerance,
int  bOnlyEdges 
) const
virtual

Return a Delaunay triangulation of the vertices of the geometry.

This function is the same as the C function OGR_G_DelaunayTriangulation().

This function is built on the GEOS library, v3.4 or above. If OGR is built without the GEOS library, this function will always fail, issuing a CPLE_NotSupported error.

Parameters
dfToleranceoptional snapping tolerance to use for improved robustness
bOnlyEdgesif TRUE, will return a MULTILINESTRING, otherwise it will return a GEOMETRYCOLLECTION containing triangular POLYGONs.
Returns
a new geometry to be freed by the caller, or NULL if an error occurs.
Since
OGR 2.1

◆ Difference()

OGRGeometry * OGRGeometry::Difference ( const OGRGeometry poOtherGeom) const
virtual

Compute difference.

Generates a new geometry which is the region of this geometry with the region of the second geometry removed.

Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.

This method is the same as the C function OGR_G_Difference().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Parameters
poOtherGeomthe other geometry removed from "this" geometry.
Returns
a new geometry to be freed by the caller, or NULL if the difference is empty or if an error occurs.

◆ Disjoint()

OGRBoolean OGRGeometry::Disjoint ( const OGRGeometry poOtherGeom) const
virtual

Test for disjointness.

Tests if this geometry and the other passed into the method are disjoint.

Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.

This method is the same as the C function OGR_G_Disjoint().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Parameters
poOtherGeomthe geometry to compare to this geometry.
Returns
TRUE if they are disjoint, otherwise FALSE.

◆ Distance()

double OGRGeometry::Distance ( const OGRGeometry poOtherGeom) const
virtual

Compute distance between two geometries.

Returns the shortest distance between the two geometries. The distance is expressed into the same unit as the coordinates of the geometries.

This method is the same as the C function OGR_G_Distance().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Parameters
poOtherGeomthe other geometry to compare against.
Returns
the distance between the geometries or -1 if an error occurs.

◆ Distance3D()

double OGRGeometry::Distance3D ( const OGRGeometry poOtherGeom) const
virtual

Returns the 3D distance between two geometries.

The distance is expressed into the same unit as the coordinates of the geometries.

This method is built on the SFCGAL library, check it for the definition of the geometry operation. If OGR is built without the SFCGAL library, this method will always return -1.0

This function is the same as the C function OGR_G_Distance3D().

Returns
distance between the two geometries
Since
GDAL 2.2

◆ dumpReadable() [1/2]

std::string OGRGeometry::dumpReadable ( const char *  pszPrefix = nullptr,
CSLConstList  papszOptions = nullptr 
) const

Dump geometry in well known text format to indicated output file.

A few options can be defined to change the default dump :

  • DISPLAY_GEOMETRY=NO : to hide the dump of the geometry
  • DISPLAY_GEOMETRY=WKT or YES (default) : dump the geometry as a WKT
  • DISPLAY_GEOMETRY=SUMMARY : to get only a summary of the geometry
  • XY_COORD_PRECISION=integer: number of decimal figures for X,Y coordinates in WKT (added in GDAL 3.9)
  • Z_COORD_PRECISION=integer: number of decimal figures for Z coordinates in WKT (added in GDAL 3.9)
Parameters
pszPrefixthe prefix to put on each line of output.
papszOptionsNULL terminated list of options (may be NULL)
Returns
a string with the geometry representation.
Since
GDAL 3.7

◆ dumpReadable() [2/2]

void OGRGeometry::dumpReadable ( FILE *  fp,
const char *  pszPrefix = nullptr,
CSLConstList  papszOptions = nullptr 
) const

Dump geometry in well known text format to indicated output file.

A few options can be defined to change the default dump :

  • DISPLAY_GEOMETRY=NO : to hide the dump of the geometry
  • DISPLAY_GEOMETRY=WKT or YES (default) : dump the geometry as a WKT
  • DISPLAY_GEOMETRY=SUMMARY : to get only a summary of the geometry

This method is the same as the C function OGR_G_DumpReadable().

Parameters
fpthe text file to write the geometry to.
pszPrefixthe prefix to put on each line of output.
papszOptionsNULL terminated list of options (may be NULL)

◆ empty()

void OGRGeometry::empty ( )
pure virtual

Clear geometry information.

This restores the geometry to its initial state after construction, and before assignment of actual geometry.

This method relates to the SFCOM IGeometry::Empty() method.

This method is the same as the C function OGR_G_Empty().

Implemented in OGRPoint, OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.

◆ Equals()

int OGRGeometry::Equals ( const OGRGeometry ) const
pure virtual

Returns TRUE if two geometries are equivalent.

This operation implements the SQL/MM ST_OrderingEquals() operation.

The comparison is done in a structural way, that is to say that the geometry types must be identical, as well as the number and ordering of sub-geometries and vertices. Or equivalently, two geometries are considered equal by this method if their WKT/WKB representation is equal. Note: this must be distinguished for equality in a spatial way (which is the purpose of the ST_Equals() operation).

This method is the same as the C function OGR_G_Equals().

Returns
TRUE if equivalent or FALSE otherwise.

Implemented in OGRPoint, OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.

◆ exportToGEOS()

GEOSGeom OGRGeometry::exportToGEOS ( GEOSContextHandle_t  hGEOSCtxt,
bool  bRemoveEmptyParts = false 
) const

Returns a GEOSGeom object corresponding to the geometry.

Parameters
hGEOSCtxtGEOS context
bRemoveEmptyPartsWhether empty parts of the geometry should be removed before exporting to GEOS (GDAL >= 3.10)
Returns
a GEOSGeom object corresponding to the geometry (to be freed with GEOSGeom_destroy_r()), or NULL in case of error

◆ exportToGML()

char * OGRGeometry::exportToGML ( const char *const *  papszOptions = nullptr) const
virtual

Convert a geometry into GML format.

The GML geometry is expressed directly in terms of GML basic data types assuming the this is available in the gml namespace. The returned string should be freed with CPLFree() when no longer required.

The supported options are :

  • FORMAT=GML2/GML3/GML32 (GML2 or GML32 added in GDAL 2.1). If not set, it will default to GML 2.1.2 output.
  • GML3_LINESTRING_ELEMENT=curve. (Only valid for FORMAT=GML3) To use gml:Curve element for linestrings. Otherwise gml:LineString will be used .
  • GML3_LONGSRS=YES/NO. (Only valid for FORMAT=GML3, deprecated by SRSNAME_FORMAT in GDAL >=2.2). Defaults to YES. If YES, SRS with EPSG authority will be written with the "urn:ogc:def:crs:EPSG::" prefix. In the case the SRS should be treated as lat/long or northing/easting, then the function will take care of coordinate order swapping if the data axis to CRS axis mapping indicates it. If set to NO, SRS with EPSG authority will be written with the "EPSG:" prefix, even if they are in lat/long order.
  • SRSNAME_FORMAT=SHORT/OGC_URN/OGC_URL (Only valid for FORMAT=GML3, added in GDAL 2.2). Defaults to OGC_URN. If SHORT, then srsName will be in the form AUTHORITY_NAME:AUTHORITY_CODE. If OGC_URN, then srsName will be in the form urn:ogc:def:crs:AUTHORITY_NAME::AUTHORITY_CODE. If OGC_URL, then srsName will be in the form http://www.opengis.net/def/crs/AUTHORITY_NAME/0/AUTHORITY_CODE. For OGC_URN and OGC_URL, in the case the SRS should be treated as lat/long or northing/easting, then the function will take care of coordinate order swapping if the data axis to CRS axis mapping indicates it.
  • GMLID=astring. If specified, a gml:id attribute will be written in the top-level geometry element with the provided value. Required for GML 3.2 compatibility.
  • SRSDIMENSION_LOC=POSLIST/GEOMETRY/GEOMETRY,POSLIST. (Only valid for FORMAT=GML3/GML32, GDAL >= 2.0) Default to POSLIST. For 2.5D geometries, define the location where to attach the srsDimension attribute. There are diverging implementations. Some put in on the <gml:posList> element, other on the top geometry element.
  • NAMESPACE_DECL=YES/NO. If set to YES, xmlns:gml="http://www.opengis.net/gml" will be added to the root node for GML < 3.2 or xmlns:gml="http://www.opengis.net/gml/3.2" for GML 3.2
  • XY_COORD_RESOLUTION=double (added in GDAL 3.9): Resolution for the coordinate precision of the X and Y coordinates. Expressed in the units of the X and Y axis of the SRS. eg 1e-5 for up to 5 decimal digits. 0 for the default behavior.
  • Z_COORD_RESOLUTION=double (added in GDAL 3.9): Resolution for the coordinate precision of the Z coordinates. Expressed in the units of the Z axis of the SRS. 0 for the default behavior.

This method is the same as the C function OGR_G_ExportToGMLEx().

Parameters
papszOptionsNULL-terminated list of options.
Returns
A GML fragment to be freed with CPLFree() or NULL in case of error.

◆ exportToJson()

char * OGRGeometry::exportToJson ( CSLConstList  papszOptions = nullptr) const
virtual

Convert a geometry into GeoJSON format.

The returned string should be freed with CPLFree() when no longer required.

The following options are supported :

  • XY_COORD_PRECISION=integer: number of decimal figures for X,Y coordinates (added in GDAL 3.9)
  • Z_COORD_PRECISION=integer: number of decimal figures for Z coordinates (added in GDAL 3.9)

This method is the same as the C function OGR_G_ExportToJson().

Parameters
papszOptionsNull terminated list of options, or null (added in 3.9)
Returns
A GeoJSON fragment to be freed with CPLFree() or NULL in case of error.

◆ exportToKML()

char * OGRGeometry::exportToKML ( ) const
virtual

Convert a geometry into KML format.

The returned string should be freed with CPLFree() when no longer required.

This method is the same as the C function OGR_G_ExportToKML().

Returns
A KML fragment to be freed with CPLFree() or NULL in case of error.

◆ exportToWkb() [1/2]

OGRErr OGRGeometry::exportToWkb ( OGRwkbByteOrder  eByteOrder,
unsigned char *  pabyData,
OGRwkbVariant  eWkbVariant = wkbVariantOldOgc 
) const

Convert a geometry into well known binary format.

This method relates to the SFCOM IWks::ExportToWKB() method.

This method is the same as the C function OGR_G_ExportToWkb() or OGR_G_ExportToIsoWkb(), depending on the value of eWkbVariant.

Parameters
eByteOrderOne of wkbXDR or wkbNDR indicating MSB or LSB byte order respectively.
pabyDataa buffer into which the binary representation is written. This buffer must be at least OGRGeometry::WkbSize() byte in size.
eWkbVariantWhat standard to use when exporting geometries with three dimensions (or more). The default wkbVariantOldOgc is the historical OGR variant. wkbVariantIso is the variant defined in ISO SQL/MM and adopted by OGC for SFSQL 1.2.
Returns
Currently OGRERR_NONE is always returned.

◆ exportToWkb() [2/2]

OGRErr OGRGeometry::exportToWkb ( unsigned char *  pabyDstBuffer,
const OGRwkbExportOptions psOptions = nullptr 
) const
pure virtual

Convert a geometry into well known binary format.

This function relates to the SFCOM IWks::ExportToWKB() method.

This function is the same as the C function OGR_G_ExportToWkbEx().

Parameters
pabyDstBuffera buffer into which the binary representation is written. This buffer must be at least OGR_G_WkbSize() byte in size.
psOptionsWKB export options.
Returns
Currently OGRERR_NONE is always returned.
Since
GDAL 3.9

Implemented in OGRPoint, OGRSimpleCurve, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRGeometryCollection, and OGRPolyhedralSurface.

◆ exportToWkt() [1/2]

OGRErr OGRGeometry::exportToWkt ( char **  ppszDstText,
OGRwkbVariant  variant = wkbVariantOldOgc 
) const

Convert a geometry into well known text format.

This method relates to the SFCOM IWks::ExportToWKT() method.

This method is the same as the C function OGR_G_ExportToWkt().

Parameters
ppszDstTexta text buffer is allocated by the program, and assigned to the passed pointer. After use, *ppszDstText should be freed with CPLFree().
variantthe specification that must be conformed too :
  • wkbVariantOgc for old-style 99-402 extended dimension (Z) WKB types
  • wkbVariantIso for SFSQL 1.2 and ISO SQL/MM Part 3
Returns
Currently OGRERR_NONE is always returned.

◆ exportToWkt() [2/2]

virtual std::string OGRGeometry::exportToWkt ( const OGRWktOptions opts = OGRWktOptions(),
OGRErr err = nullptr 
) const
pure virtual

◆ flattenTo2D()

void OGRGeometry::flattenTo2D ( )
pure virtual

Convert geometry to strictly 2D.

In a sense this converts all Z coordinates to 0.0.

This method is the same as the C function OGR_G_FlattenTo2D().

Implemented in OGRPoint, OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.

◆ freeGEOSContext()

void OGRGeometry::freeGEOSContext ( GEOSContextHandle_t  hGEOSCtxt)
static

Destroy a GEOS context.

Parameters
hGEOSCtxtGEOS context

◆ FromHandle()

static OGRGeometry * OGRGeometry::FromHandle ( OGRGeometryH  hGeom)
inlinestatic

Convert a OGRGeometryH to a OGRGeometry*.

Since
GDAL 2.3

◆ getCoordinateDimension()

int OGRGeometry::getCoordinateDimension ( ) const
virtual

Get the dimension of the coordinates in this object.

This method is the same as the C function OGR_G_GetCoordinateDimension().

Deprecated:
use CoordinateDimension().
Returns
this will return 2 or 3.

◆ getCurveGeometry()

OGRGeometry * OGRGeometry::getCurveGeometry ( const char *const *  papszOptions = nullptr) const
virtual

Return curve version of this geometry.

Returns a geometry that has possibly CIRCULARSTRING, COMPOUNDCURVE, CURVEPOLYGON, MULTICURVE or MULTISURFACE in it, by de-approximating curve geometries.

If the geometry has no curve portion, the returned geometry will be a clone of it.

The ownership of the returned geometry belongs to the caller.

The reverse method is OGRGeometry::getLinearGeometry().

This function is the same as C function OGR_G_GetCurveGeometry().

Parameters
papszOptionsoptions as a null-terminated list of strings. Unused for now. Must be set to NULL.
Returns
a new geometry to be freed by the caller, or NULL if an error occurs.
Since
GDAL 2.0

Reimplemented in OGRLineString, OGRPolygon, and OGRGeometryCollection.

◆ getDimension()

int OGRGeometry::getDimension ( ) const
pure virtual

Get the dimension of this object.

This method corresponds to the SFCOM IGeometry::GetDimension() method. It indicates the dimension of the object, but does not indicate the dimension of the underlying space (as indicated by OGRGeometry::getCoordinateDimension()).

This method is the same as the C function OGR_G_GetDimension().

Returns
0 for points, 1 for lines and 2 for surfaces.

Implemented in OGRPoint, OGRCurve, OGRCurvePolygon, OGRGeometryCollection, OGRMultiSurface, OGRPolyhedralSurface, OGRMultiPoint, and OGRMultiCurve.

◆ getEnvelope() [1/2]

void OGRGeometry::getEnvelope ( OGREnvelope psEnvelope) const
pure virtual

Computes and returns the bounding envelope for this geometry in the passed psEnvelope structure.

This method is the same as the C function OGR_G_GetEnvelope().

Parameters
psEnvelopethe structure in which to place the results.

Implemented in OGRPoint, OGRSimpleCurve, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.

◆ getEnvelope() [2/2]

void OGRGeometry::getEnvelope ( OGREnvelope3D psEnvelope) const
pure virtual

Computes and returns the bounding envelope (3D) for this geometry in the passed psEnvelope structure.

This method is the same as the C function OGR_G_GetEnvelope3D().

Parameters
psEnvelopethe structure in which to place the results.
Since
OGR 1.9.0

Implemented in OGRPoint, OGRSimpleCurve, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.

◆ getGeometryName()

const char * OGRGeometry::getGeometryName ( ) const
pure virtual

Fetch WKT name for geometry type.

There is no SFCOM analog to this method.

This method is the same as the C function OGR_G_GetGeometryName().

Returns
name used for this geometry type in well known text format. The returned pointer is to a static internal string and should not be modified or freed.

Implemented in OGRPoint, OGRLineString, OGRLinearRing, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRTriangle, OGRGeometryCollection, OGRMultiSurface, OGRMultiPolygon, OGRPolyhedralSurface, OGRTriangulatedSurface, OGRMultiPoint, OGRMultiCurve, and OGRMultiLineString.

◆ getGeometryType()

OGRwkbGeometryType OGRGeometry::getGeometryType ( ) const
pure virtual

Fetch geometry type.

Note that the geometry type may include the 2.5D flag. To get a 2D flattened version of the geometry type apply the wkbFlatten() macro to the return result.

This method is the same as the C function OGR_G_GetGeometryType().

Returns
the geometry type code.

Implemented in OGRPoint, OGRLineString, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRTriangle, OGRGeometryCollection, OGRMultiSurface, OGRMultiPolygon, OGRPolyhedralSurface, OGRTriangulatedSurface, OGRMultiPoint, OGRMultiCurve, and OGRMultiLineString.

◆ getIsoGeometryType()

OGRwkbGeometryType OGRGeometry::getIsoGeometryType ( ) const

Get the geometry type that conforms with ISO SQL/MM Part3.

Returns
the geometry type that conforms with ISO SQL/MM Part3

◆ getLinearGeometry()

OGRGeometry * OGRGeometry::getLinearGeometry ( double  dfMaxAngleStepSizeDegrees = 0,
const char *const *  papszOptions = nullptr 
) const
virtual

Return, possibly approximate, non-curve version of this geometry.

Returns a geometry that has no CIRCULARSTRING, COMPOUNDCURVE, CURVEPOLYGON, MULTICURVE or MULTISURFACE in it, by approximating curve geometries.

The ownership of the returned geometry belongs to the caller.

The reverse method is OGRGeometry::getCurveGeometry().

This method is the same as the C function OGR_G_GetLinearGeometry().

Parameters
dfMaxAngleStepSizeDegreesthe largest step in degrees along the arc, zero to use the default setting.
papszOptionsoptions as a null-terminated list of strings. See OGRGeometryFactory::curveToLineString() for valid options.
Returns
a new geometry to be freed by the caller, or NULL if an error occurs.
Since
GDAL 2.0

Reimplemented in OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, and OGRGeometryCollection.

◆ getSpatialReference()

OGRSpatialReference * OGRGeometry::getSpatialReference ( void  ) const
inline

Returns spatial reference system for object.

This method relates to the SFCOM IGeometry::get_SpatialReference() method.

This method is the same as the C function OGR_G_GetSpatialReference().

Returns
a reference to the spatial reference object. The object may be shared with many geometry objects, and should not be modified.

◆ hasCurveGeometry()

OGRBoolean OGRGeometry::hasCurveGeometry ( int  bLookForNonLinear = FALSE) const
virtual

Returns if this geometry is or has curve geometry.

Returns if a geometry is, contains or may contain a CIRCULARSTRING, COMPOUNDCURVE, CURVEPOLYGON, MULTICURVE or MULTISURFACE.

If bLookForNonLinear is set to TRUE, it will be actually looked if the geometry or its subgeometries are or contain a non-linear geometry in them. In which case, if the method returns TRUE, it means that getLinearGeometry() would return an approximate version of the geometry. Otherwise, getLinearGeometry() would do a conversion, but with just converting container type, like COMPOUNDCURVE -> LINESTRING, MULTICURVE -> MULTILINESTRING or MULTISURFACE -> MULTIPOLYGON, resulting in a "loss-less" conversion.

This method is the same as the C function OGR_G_HasCurveGeometry().

Parameters
bLookForNonLinearset it to TRUE to check if the geometry is or contains a CIRCULARSTRING.
Returns
TRUE if this geometry is or has curve geometry.
Since
GDAL 2.0

Reimplemented in OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRGeometryCollection, OGRMultiSurface, OGRMultiPolygon, OGRPolyhedralSurface, OGRMultiPoint, OGRMultiCurve, and OGRMultiLineString.

◆ hasEmptyParts()

bool OGRGeometry::hasEmptyParts ( ) const
virtual

Returns whether a geometry has empty parts/rings.

Returns true if removeEmptyParts() will modify the geometry.

This is different from IsEmpty().

Since
GDAL 3.10

Reimplemented in OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.

◆ importFromWkb() [1/2]

OGRErr OGRGeometry::importFromWkb ( const GByte pabyData,
size_t  nSize = static_cast<size_t>(-1),
OGRwkbVariant  eWkbVariant = wkbVariantOldOgc 
)

Assign geometry from well known binary data.

The object must have already been instantiated as the correct derived type of geometry object to match the binaries type. This method is used by the OGRGeometryFactory class, but not normally called by application code.

This method relates to the SFCOM IWks::ImportFromWKB() method.

This method is the same as the C function OGR_G_ImportFromWkb().

Parameters
pabyDatathe binary input data.
nSizethe size of pabyData in bytes, or -1 if not known.
eWkbVariantif wkbVariantPostGIS1, special interpretation is done for curve geometries code
Returns
OGRERR_NONE if all goes well, otherwise any of OGRERR_NOT_ENOUGH_DATA, OGRERR_UNSUPPORTED_GEOMETRY_TYPE, or OGRERR_CORRUPT_DATA may be returned.

◆ importFromWkb() [2/2]

OGRErr OGRGeometry::importFromWkb ( const unsigned char *  pabyData,
size_t  nSize,
OGRwkbVariant  eWkbVariant,
size_t &  nBytesConsumedOut 
)
pure virtual

Assign geometry from well known binary data.

The object must have already been instantiated as the correct derived type of geometry object to match the binaries type. This method is used by the OGRGeometryFactory class, but not normally called by application code.

This method relates to the SFCOM IWks::ImportFromWKB() method.

This method is the same as the C function OGR_G_ImportFromWkb().

Parameters
pabyDatathe binary input data.
nSizethe size of pabyData in bytes, or -1 if not known.
eWkbVariantif wkbVariantPostGIS1, special interpretation is done for curve geometries code
nBytesConsumedOutoutput parameter. Number of bytes consumed.
Returns
OGRERR_NONE if all goes well, otherwise any of OGRERR_NOT_ENOUGH_DATA, OGRERR_UNSUPPORTED_GEOMETRY_TYPE, or OGRERR_CORRUPT_DATA may be returned.
Since
GDAL 2.3

Implemented in OGRPoint, OGRSimpleCurve, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRTriangle, OGRGeometryCollection, OGRMultiPolygon, OGRPolyhedralSurface, and OGRMultiLineString.

◆ importFromWkt() [1/2]

OGRErr OGRGeometry::importFromWkt ( char **  ppszInput)
inline

Deprecated.

Deprecated:
in GDAL 2.3

◆ importFromWkt() [2/2]

OGRErr OGRGeometry::importFromWkt ( const char **  ppszInput)
pure virtual

Assign geometry from well known text data.

The object must have already been instantiated as the correct derived type of geometry object to match the text type. This method is used by the OGRGeometryFactory class, but not normally called by application code.

This method relates to the SFCOM IWks::ImportFromWKT() method.

This method is the same as the C function OGR_G_ImportFromWkt().

Parameters
ppszInputpointer to a pointer to the source text. The pointer is updated to pointer after the consumed text.
Returns
OGRERR_NONE if all goes well, otherwise any of OGRERR_NOT_ENOUGH_DATA, OGRERR_UNSUPPORTED_GEOMETRY_TYPE, or OGRERR_CORRUPT_DATA may be returned.

Implemented in OGRPoint, OGRSimpleCurve, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRGeometryCollection, OGRMultiSurface, OGRPolyhedralSurface, OGRMultiPoint, OGRMultiCurve, OGRPoint, OGRSimpleCurve, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRGeometryCollection, OGRMultiSurface, OGRPolyhedralSurface, OGRMultiPoint, and OGRMultiCurve.

◆ Intersection()

OGRGeometry * OGRGeometry::Intersection ( const OGRGeometry poOtherGeom) const
virtual

Compute intersection.

Generates a new geometry which is the region of intersection of the two geometries operated on. The Intersects() method can be used to test if two geometries intersect.

Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.

This method is the same as the C function OGR_G_Intersection().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Parameters
poOtherGeomthe other geometry intersected with "this" geometry.
Returns
a new geometry to be freed by the caller, or NULL if there is no intersection or if an error occurs.

◆ Intersects()

OGRBoolean OGRGeometry::Intersects ( const OGRGeometry poOtherGeom) const
virtual

Do these features intersect?

Determines whether two geometries intersect. If GEOS is enabled, then this is done in rigorous fashion otherwise TRUE is returned if the envelopes (bounding boxes) of the two geometries overlap.

The poOtherGeom argument may be safely NULL, but in this case the method will always return TRUE. That is, a NULL geometry is treated as being everywhere.

This method is the same as the C function OGR_G_Intersects().

Parameters
poOtherGeomthe other geometry to test against.
Returns
TRUE if the geometries intersect, otherwise FALSE.

Reimplemented in OGRPoint, and OGRCurvePolygon.

◆ Is3D()

OGRBoolean OGRGeometry::Is3D ( ) const
inline

Returns whether the geometry has a Z component.

◆ IsEmpty()

OGRBoolean OGRGeometry::IsEmpty ( ) const
pure virtual

Returns TRUE (non-zero) if the object has no points.

Normally this returns FALSE except between when an object is instantiated and points have been assigned.

This method relates to the SFCOM IGeometry::IsEmpty() method.

Returns
TRUE if object is empty, otherwise FALSE.

Implemented in OGRPoint, OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.

◆ IsMeasured()

OGRBoolean OGRGeometry::IsMeasured ( ) const
inline

Returns whether the geometry has a M component.

◆ IsRectangle()

bool OGRGeometry::IsRectangle ( ) const

Returns whether the geometry is a polygon with 4 corners forming a rectangle.

Since
GDAL 3.10

◆ IsRing()

OGRBoolean OGRGeometry::IsRing ( ) const
virtual

Test if the geometry is a ring.

This method is the same as the C function OGR_G_IsRing().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always return FALSE.

Returns
TRUE if the geometry has no points, otherwise FALSE.

◆ IsSimple()

OGRBoolean OGRGeometry::IsSimple ( ) const
virtual

Test if the geometry is simple.

This method is the same as the C function OGR_G_IsSimple().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always return FALSE.

Returns
TRUE if the geometry has no points, otherwise FALSE.

◆ IsValid()

OGRBoolean OGRGeometry::IsValid ( ) const
virtual

Test if the geometry is valid.

This method is the same as the C function OGR_G_IsValid().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always return FALSE.

Returns
TRUE if the geometry has no points, otherwise FALSE.

Reimplemented in OGRCircularString.

◆ MakeValid()

OGRGeometry * OGRGeometry::MakeValid ( CSLConstList  papszOptions = nullptr) const
virtual

Attempts to make an invalid geometry valid without losing vertices.

Already-valid geometries are cloned without further intervention for default MODE=LINEWORK. Already-valid geometries with MODE=STRUCTURE may be subject to non-significant transformations, such as duplicated point removal, change in ring winding order, etc. (before GDAL 3.10, single-part geometry collections could be returned a single geometry. GDAL 3.10 returns the same type of geometry).

Running OGRGeometryFactory::removeLowerDimensionSubGeoms() as a post-processing step is often desired.

This method is the same as the C function OGR_G_MakeValid().

This function is built on the GEOS >= 3.8 library, check it for the definition of the geometry operation. If OGR is built without the GEOS >= 3.8 library, this function will return a clone of the input geometry if it is valid, or NULL if it is invalid

Parameters
papszOptionsNULL terminated list of options, or NULL. The following options are available:
  • METHOD=LINEWORK/STRUCTURE. LINEWORK is the default method, which combines all rings into a set of noded lines and then extracts valid polygons from that linework. The STRUCTURE method (requires GEOS >= 3.10 and GDAL >= 3.4) first makes all rings valid, then merges shells and subtracts holes from shells to generate valid result. Assumes that holes and shells are correctly categorized.
  • KEEP_COLLAPSED=YES/NO. Only for METHOD=STRUCTURE. NO (default): collapses are converted to empty geometries YES: collapses are converted to a valid geometry of lower dimension.
Returns
a new geometry to be freed by the caller, or NULL if an error occurs.
Since
GDAL 3.0

◆ Normalize()

OGRGeometry * OGRGeometry::Normalize ( ) const
virtual

Attempts to bring geometry into normalized/canonical form.

This method is the same as the C function OGR_G_Normalize().

This function is built on the GEOS library; check it for the definition of the geometry operation. If OGR is built without the GEOS library, this function will always fail, issuing a CPLE_NotSupported error.

Returns
a new geometry to be freed by the caller, or NULL if an error occurs.
Since
GDAL 3.3

◆ operator=()

OGRGeometry & OGRGeometry::operator= ( const OGRGeometry other)

Assignment operator.

Note: before GDAL 2.1, only the default implementation of the operator existed, which could be unsafe to use.

Since
GDAL 2.1

◆ Overlaps()

OGRBoolean OGRGeometry::Overlaps ( const OGRGeometry poOtherGeom) const
virtual

Test for overlap.

Tests if this geometry and the other passed into the method overlap, that is their intersection has a non-zero area.

Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.

This method is the same as the C function OGR_G_Overlaps().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Parameters
poOtherGeomthe geometry to compare to this geometry.
Returns
TRUE if they are overlapping, otherwise FALSE.

◆ Polygonize()

OGRGeometry * OGRGeometry::Polygonize ( ) const
virtual

Polygonizes a set of sparse edges.

A new geometry object is created and returned containing a collection of reassembled Polygons: NULL will be returned if the input collection doesn't corresponds to a MultiLinestring, or when reassembling Edges into Polygons is impossible due to topological inconsistencies.

This method is the same as the C function OGR_G_Polygonize().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Returns
a new geometry to be freed by the caller, or NULL if an error occurs.
Since
OGR 1.9.0

◆ removeEmptyParts()

void OGRGeometry::removeEmptyParts ( )
virtual

Remove empty parts/rings from this geometry.

Since
GDAL 3.10

Reimplemented in OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.

◆ roundCoordinates()

void OGRGeometry::roundCoordinates ( const OGRGeomCoordinatePrecision sPrecision)

Round coordinates of the geometry to the specified precision.

Note that this is not the same as OGRGeometry::SetPrecision(). The later will return valid geometries, whereas roundCoordinates() does not make such guarantee and may return geometries with invalidities, if they are not compatible of the specified precision. roundCoordinates() supports curve geometries, whereas SetPrecision() does not currently.

One use case for roundCoordinates() is to undo the effect of quantizeCoordinates().

Parameters
sPrecisionContains the precision requirements.
Since
GDAL 3.9

◆ roundCoordinatesIEEE754()

void OGRGeometry::roundCoordinatesIEEE754 ( const OGRGeomCoordinateBinaryPrecision options)

Round coordinates of a geometry, exploiting characteristics of the IEEE-754 double-precision binary representation.

Determines the number of bits (N) required to represent a coordinate value with a specified number of digits after the decimal point, and then sets all but the N most significant bits to zero. The resulting coordinate value will still round to the original value (e.g. after roundCoordinates()), but will have improved compressiblity.

Parameters
optionsContains the precision requirements.
Since
GDAL 3.9

◆ segmentize()

bool OGRGeometry::segmentize ( double  dfMaxLength)
virtual

Modify the geometry such it has no segment longer then the given distance.

This method modifies the geometry to add intermediate vertices if necessary so that the maximum length between 2 consecutive vertices is lower than dfMaxLength.

Interpolated points will have Z and M values (if needed) set to 0. Distance computation is performed in 2d only

This function is the same as the C function OGR_G_Segmentize()

Parameters
dfMaxLengththe maximum distance between 2 points after segmentization
Returns
(since 3.10) true in case of success, false in case of error.

Reimplemented in OGRSimpleCurve, OGRCircularString, OGRCompoundCurve, OGRCurvePolygon, and OGRGeometryCollection.

◆ set3D()

bool OGRGeometry::set3D ( OGRBoolean  bIs3D)
virtual

Add or remove the Z coordinate dimension.

This method adds or removes the explicit Z coordinate dimension. Removing the Z coordinate dimension of a geometry will remove any existing Z values. Adding the Z dimension to a geometry collection, a compound curve, a polygon, etc. will affect the children geometries.

Parameters
bIs3DShould the geometry have a Z dimension, either TRUE or FALSE.
Returns
(since 3.10) true in case of success, false in case of memory allocation error
Since
GDAL 2.1

Reimplemented in OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.

◆ setCoordinateDimension()

bool OGRGeometry::setCoordinateDimension ( int  nNewDimension)
virtual

Set the coordinate dimension.

This method sets the explicit coordinate dimension. Setting the coordinate dimension of a geometry to 2 should zero out any existing Z values. Setting the dimension of a geometry collection, a compound curve, a polygon, etc. will affect the children geometries. This will also remove the M dimension if present before this call.

Deprecated:
use set3D() or setMeasured().
Parameters
nNewDimensionNew coordinate dimension value, either 2 or 3.
Returns
(since 3.10) true in case of success, false in case of memory allocation error

Reimplemented in OGRPoint, OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.

◆ setMeasured()

bool OGRGeometry::setMeasured ( OGRBoolean  bIsMeasured)
virtual

Add or remove the M coordinate dimension.

This method adds or removes the explicit M coordinate dimension. Removing the M coordinate dimension of a geometry will remove any existing M values. Adding the M dimension to a geometry collection, a compound curve, a polygon, etc. will affect the children geometries.

Parameters
bIsMeasuredShould the geometry have a M dimension, either TRUE or FALSE.
Returns
(since 3.10) true in case of success, false in case of memory allocation error
Since
GDAL 2.1

Reimplemented in OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.

◆ SetPrecision()

OGRGeometry * OGRGeometry::SetPrecision ( double  dfGridSize,
int  nFlags 
) const

Set the geometry's precision, rounding all its coordinates to the precision grid, and making sure the geometry is still valid.

This is a stronger version of roundCoordinates().

Note that at time of writing GEOS does no supported curve geometries. So currently if this function is called on such a geometry, OGR will first call getLinearGeometry() on the input and getCurveGeometry() on the output, but that it is unlikely to yield to the expected result.

This function is the same as the C function OGR_G_SetPrecision().

This function is built on the GEOSGeom_setPrecision_r() function of the GEOS library. Check it for the definition of the geometry operation. If OGR is built without the GEOS library, this function will always fail, issuing a CPLE_NotSupported error.

Parameters
dfGridSizesize of the precision grid, or 0 for FLOATING precision.
nFlagsThe bitwise OR of zero, one or several of OGR_GEOS_PREC_NO_TOPO and OGR_GEOS_PREC_KEEP_COLLAPSED
Returns
a new geometry to be freed by the caller, or NULL if an error occurs.
Since
GDAL 3.9

◆ Simplify()

OGRGeometry * OGRGeometry::Simplify ( double  dTolerance) const
virtual

Simplify the geometry.

This function is the same as the C function OGR_G_Simplify().

This function is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this function will always fail, issuing a CPLE_NotSupported error.

Parameters
dTolerancethe distance tolerance for the simplification.
Returns
a new geometry to be freed by the caller, or NULL if an error occurs.
Since
OGR 1.8.0

◆ SimplifyPreserveTopology()

OGRGeometry * OGRGeometry::SimplifyPreserveTopology ( double  dTolerance) const

Simplify the geometry while preserving topology.

This function is the same as the C function OGR_G_SimplifyPreserveTopology().

This function is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this function will always fail, issuing a CPLE_NotSupported error.

Parameters
dTolerancethe distance tolerance for the simplification.
Returns
a new geometry to be freed by the caller, or NULL if an error occurs.
Since
OGR 1.9.0

◆ swapXY()

void OGRGeometry::swapXY ( )
virtual

Swap x and y coordinates.

Since
OGR 1.8.0

Reimplemented in OGRPoint, OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRGeometryCollection, and OGRPolyhedralSurface.

◆ SymDifference()

OGRGeometry * OGRGeometry::SymDifference ( const OGRGeometry poOtherGeom) const
virtual

Compute symmetric difference.

Generates a new geometry which is the symmetric difference of this geometry and the second geometry passed into the method.

Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.

This method is the same as the C function OGR_G_SymDifference().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Parameters
poOtherGeomthe other geometry.
Returns
a new geometry to be freed by the caller, or NULL if the difference is empty or if an error occurs.
Since
OGR 1.8.0

◆ toCircularString() [1/2]

OGRCircularString * OGRGeometry::toCircularString ( )
inline

Down-cast to OGRCircularString*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbCircularString.

Since
GDAL 2.3

◆ toCircularString() [2/2]

const OGRCircularString * OGRGeometry::toCircularString ( ) const
inline

Down-cast to OGRCircularString*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbCircularString.

Since
GDAL 2.3

◆ toCompoundCurve() [1/2]

OGRCompoundCurve * OGRGeometry::toCompoundCurve ( )
inline

Down-cast to OGRCompoundCurve*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbCompoundCurve.

Since
GDAL 2.3

◆ toCompoundCurve() [2/2]

const OGRCompoundCurve * OGRGeometry::toCompoundCurve ( ) const
inline

Down-cast to OGRCompoundCurve*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbCompoundCurve.

Since
GDAL 2.3

◆ toCurve() [1/2]

OGRCurve * OGRGeometry::toCurve ( )
inline

Down-cast to OGRCurve*.

Implies prior checking that OGR_GT_IsSubClass(getGeometryType(), wkbCurve).

Since
GDAL 2.3

◆ toCurve() [2/2]

const OGRCurve * OGRGeometry::toCurve ( ) const
inline

Down-cast to OGRCurve*.

Implies prior checking that OGR_GT_IsSubClass(getGeometryType(), wkbCurve).

Since
GDAL 2.3

◆ toCurvePolygon() [1/2]

OGRCurvePolygon * OGRGeometry::toCurvePolygon ( )
inline

Down-cast to OGRCurvePolygon*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbCurvePolygon or wkbPolygon or wkbTriangle.

Since
GDAL 2.3

◆ toCurvePolygon() [2/2]

const OGRCurvePolygon * OGRGeometry::toCurvePolygon ( ) const
inline

Down-cast to OGRCurvePolygon*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbCurvePolygon or wkbPolygon or wkbTriangle.

Since
GDAL 2.3

◆ toGeometryCollection() [1/2]

OGRGeometryCollection * OGRGeometry::toGeometryCollection ( )
inline

Down-cast to OGRGeometryCollection*.

Implies prior checking that OGR_GT_IsSubClass(getGeometryType(), wkbGeometryCollection).

Since
GDAL 2.3

◆ toGeometryCollection() [2/2]

const OGRGeometryCollection * OGRGeometry::toGeometryCollection ( ) const
inline

Down-cast to OGRGeometryCollection*.

Implies prior checking that OGR_GT_IsSubClass(getGeometryType(), wkbGeometryCollection).

Since
GDAL 2.3

◆ ToHandle()

static OGRGeometryH OGRGeometry::ToHandle ( OGRGeometry poGeom)
inlinestatic

Convert a OGRGeometry* to a OGRGeometryH.

Since
GDAL 2.3

◆ toLinearRing() [1/2]

OGRLinearRing * OGRGeometry::toLinearRing ( )
inline

Down-cast to OGRLinearRing*.

Implies prior checking that EQUAL(getGeometryName(), "LINEARRING").

Since
GDAL 2.3

◆ toLinearRing() [2/2]

const OGRLinearRing * OGRGeometry::toLinearRing ( ) const
inline

Down-cast to OGRLinearRing*.

Implies prior checking that EQUAL(getGeometryName(), "LINEARRING").

Since
GDAL 2.3

◆ toLineString() [1/2]

OGRLineString * OGRGeometry::toLineString ( )
inline

Down-cast to OGRLineString*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbLineString.

Since
GDAL 2.3

◆ toLineString() [2/2]

const OGRLineString * OGRGeometry::toLineString ( ) const
inline

Down-cast to OGRLineString*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbLineString.

Since
GDAL 2.3

◆ toMultiCurve() [1/2]

OGRMultiCurve * OGRGeometry::toMultiCurve ( )
inline

Down-cast to OGRMultiCurve*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiCurve and derived types.

Since
GDAL 2.3

◆ toMultiCurve() [2/2]

const OGRMultiCurve * OGRGeometry::toMultiCurve ( ) const
inline

Down-cast to OGRMultiCurve*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiCurve and derived types.

Since
GDAL 2.3

◆ toMultiLineString() [1/2]

OGRMultiLineString * OGRGeometry::toMultiLineString ( )
inline

Down-cast to OGRMultiLineString*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiLineString.

Since
GDAL 2.3

◆ toMultiLineString() [2/2]

const OGRMultiLineString * OGRGeometry::toMultiLineString ( ) const
inline

Down-cast to OGRMultiLineString*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiLineString.

Since
GDAL 2.3

◆ toMultiPoint() [1/2]

OGRMultiPoint * OGRGeometry::toMultiPoint ( )
inline

Down-cast to OGRMultiPoint*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiPoint.

Since
GDAL 2.3

◆ toMultiPoint() [2/2]

const OGRMultiPoint * OGRGeometry::toMultiPoint ( ) const
inline

Down-cast to OGRMultiPoint*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiPoint.

Since
GDAL 2.3

◆ toMultiPolygon() [1/2]

OGRMultiPolygon * OGRGeometry::toMultiPolygon ( )
inline

Down-cast to OGRMultiPolygon*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiPolygon.

Since
GDAL 2.3

◆ toMultiPolygon() [2/2]

const OGRMultiPolygon * OGRGeometry::toMultiPolygon ( ) const
inline

Down-cast to OGRMultiPolygon*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiPolygon.

Since
GDAL 2.3

◆ toMultiSurface() [1/2]

OGRMultiSurface * OGRGeometry::toMultiSurface ( )
inline

Down-cast to OGRMultiSurface*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiSurface and derived types.

Since
GDAL 2.3

◆ toMultiSurface() [2/2]

const OGRMultiSurface * OGRGeometry::toMultiSurface ( ) const
inline

Down-cast to OGRMultiSurface*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbMultiSurface and derived types.

Since
GDAL 2.3

◆ toPoint() [1/2]

OGRPoint * OGRGeometry::toPoint ( )
inline

Down-cast to OGRPoint*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbPoint.

Since
GDAL 2.3

◆ toPoint() [2/2]

const OGRPoint * OGRGeometry::toPoint ( ) const
inline

Down-cast to OGRPoint*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbPoint.

Since
GDAL 2.3

◆ toPolygon() [1/2]

OGRPolygon * OGRGeometry::toPolygon ( )
inline

Down-cast to OGRPolygon*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbPolygon or wkbTriangle.

Since
GDAL 2.3

◆ toPolygon() [2/2]

const OGRPolygon * OGRGeometry::toPolygon ( ) const
inline

Down-cast to OGRPolygon*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbPolygon or wkbTriangle.

Since
GDAL 2.3

◆ toPolyhedralSurface() [1/2]

OGRPolyhedralSurface * OGRGeometry::toPolyhedralSurface ( )
inline

Down-cast to OGRPolyhedralSurface*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbPolyhedralSurface or wkbTIN.

Since
GDAL 2.3

◆ toPolyhedralSurface() [2/2]

const OGRPolyhedralSurface * OGRGeometry::toPolyhedralSurface ( ) const
inline

Down-cast to OGRPolyhedralSurface*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbPolyhedralSurface or wkbTIN.

Since
GDAL 2.3

◆ toSimpleCurve() [1/2]

OGRSimpleCurve * OGRGeometry::toSimpleCurve ( )
inline

Down-cast to OGRSimpleCurve*.

Implies prior checking that getGeometryType() is wkbLineString, wkbCircularString or a derived type.

Since
GDAL 2.3

◆ toSimpleCurve() [2/2]

const OGRSimpleCurve * OGRGeometry::toSimpleCurve ( ) const
inline

Down-cast to OGRSimpleCurve*.

Implies prior checking that getGeometryType() is wkbLineString, wkbCircularString or a derived type.

Since
GDAL 2.3

◆ toSurface() [1/2]

OGRSurface * OGRGeometry::toSurface ( )
inline

Down-cast to OGRSurface*.

Implies prior checking that OGR_GT_IsSubClass(getGeometryType(), wkbSurface).

Since
GDAL 2.3

◆ toSurface() [2/2]

const OGRSurface * OGRGeometry::toSurface ( ) const
inline

Down-cast to OGRSurface*.

Implies prior checking that OGR_GT_IsSubClass(getGeometryType(), wkbSurface).

Since
GDAL 2.3

◆ toTriangle() [1/2]

OGRTriangle * OGRGeometry::toTriangle ( )
inline

Down-cast to OGRTriangle*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbTriangle.

Since
GDAL 2.3

◆ toTriangle() [2/2]

const OGRTriangle * OGRGeometry::toTriangle ( ) const
inline

Down-cast to OGRTriangle*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbTriangle.

Since
GDAL 2.3

◆ toTriangulatedSurface() [1/2]

OGRTriangulatedSurface * OGRGeometry::toTriangulatedSurface ( )
inline

Down-cast to OGRTriangulatedSurface*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbTIN.

Since
GDAL 2.3

◆ toTriangulatedSurface() [2/2]

const OGRTriangulatedSurface * OGRGeometry::toTriangulatedSurface ( ) const
inline

Down-cast to OGRTriangulatedSurface*.

Implies prior checking that wkbFlatten(getGeometryType()) == wkbTIN.

Since
GDAL 2.3

◆ Touches()

OGRBoolean OGRGeometry::Touches ( const OGRGeometry poOtherGeom) const
virtual

Test for touching.

Tests if this geometry and the other passed into the method are touching.

Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.

This method is the same as the C function OGR_G_Touches().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Parameters
poOtherGeomthe geometry to compare to this geometry.
Returns
TRUE if they are touching, otherwise FALSE.

◆ transform()

OGRErr OGRGeometry::transform ( OGRCoordinateTransformation poCT)
pure virtual

Apply arbitrary coordinate transformation to geometry.

This method will transform the coordinates of a geometry from their current spatial reference system to a new target spatial reference system. Normally this means reprojecting the vectors, but it could include datum shifts, and changes of units.

Note that this method does not require that the geometry already have a spatial reference system. It will be assumed that they can be treated as having the source spatial reference system of the OGRCoordinateTransformation object, and the actual SRS of the geometry will be ignored. On successful completion the output OGRSpatialReference of the OGRCoordinateTransformation will be assigned to the geometry.

This method only does reprojection on a point-by-point basis. It does not include advanced logic to deal with discontinuities at poles or antimeridian. For that, use the OGRGeometryFactory::transformWithOptions() method.

This method is the same as the C function OGR_G_Transform().

Parameters
poCTthe transformation to apply.
Returns
OGRERR_NONE on success or an error code.

Implemented in OGRPolyhedralSurface, OGRPoint, OGRSimpleCurve, OGRLinearRing, OGRCompoundCurve, OGRCurvePolygon, and OGRGeometryCollection.

◆ transformTo()

OGRErr OGRGeometry::transformTo ( const OGRSpatialReference poSR)

Transform geometry to new spatial reference system.

This method will transform the coordinates of a geometry from their current spatial reference system to a new target spatial reference system. Normally this means reprojecting the vectors, but it could include datum shifts, and changes of units.

This method will only work if the geometry already has an assigned spatial reference system, and if it is transformable to the target coordinate system.

Because this method requires internal creation and initialization of an OGRCoordinateTransformation object it is significantly more expensive to use this method to transform many geometries than it is to create the OGRCoordinateTransformation in advance, and call transform() with that transformation. This method exists primarily for convenience when only transforming a single geometry.

This method is the same as the C function OGR_G_TransformTo().

Parameters
poSRspatial reference system to transform to.
Returns
OGRERR_NONE on success, or an error code.

◆ UnaryUnion()

OGRGeometry * OGRGeometry::UnaryUnion ( ) const

Returns the union of all components of a single geometry.

Usually used to convert a collection into the smallest set of polygons that cover the same area.

See https://postgis.net/docs/ST_UnaryUnion.html for more details.

This method is the same as the C function OGR_G_UnaryUnion().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Returns
a new geometry to be freed by the caller, or NULL if an error occurs.
Since
GDAL 3.7

◆ Union()

OGRGeometry * OGRGeometry::Union ( const OGRGeometry poOtherGeom) const
virtual

Compute union.

Generates a new geometry which is the region of union of the two geometries operated on.

Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.

This method is the same as the C function OGR_G_Union().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Parameters
poOtherGeomthe other geometry unioned with "this" geometry.
Returns
a new geometry to be freed by the caller, or NULL if an error occurs.

◆ UnionCascaded()

OGRGeometry * OGRGeometry::UnionCascaded ( ) const
virtual

Compute union using cascading.

Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.

The input geometry must be a MultiPolygon.

This method is the same as the C function OGR_G_UnionCascaded().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Returns
a new geometry to be freed by the caller, or NULL if an error occurs.
Since
OGR 1.8.0
Deprecated:
Use UnaryUnion() instead

◆ Within()

OGRBoolean OGRGeometry::Within ( const OGRGeometry poOtherGeom) const
virtual

Test for containment.

Tests if actual geometry object is within the passed geometry.

Geometry validity is not checked. In case you are unsure of the validity of the input geometries, call IsValid() before, otherwise the result might be wrong.

This method is the same as the C function OGR_G_Within().

This method is built on the GEOS library, check it for the definition of the geometry operation. If OGR is built without the GEOS library, this method will always fail, issuing a CPLE_NotSupported error.

Parameters
poOtherGeomthe geometry to compare to this geometry.
Returns
TRUE if poOtherGeom is within this geometry, otherwise FALSE.

Reimplemented in OGRPoint.

◆ WkbSize()

int OGRGeometry::WkbSize ( ) const
pure virtual

Returns size of related binary representation.

This method returns the exact number of bytes required to hold the well known binary representation of this geometry object. Its computation may be slightly expensive for complex geometries.

This method relates to the SFCOM IWks::WkbSize() method.

This method is the same as the C function OGR_G_WkbSize().

Returns
size of binary representation in bytes.

Implemented in OGRPoint, OGRSimpleCurve, OGRCompoundCurve, OGRCurvePolygon, OGRPolygon, OGRGeometryCollection, and OGRPolyhedralSurface.


The documentation for this class was generated from the following files: