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Proxy of C++ OGRGeometryShadow class.










































































































































































































ExportToWkt(Geometry self) > OGRErr OGRErr OGR_G_ExportToWkt(OGRGeometryH hGeom, char **ppszSrcText) Convert a geometry into well known text format. This function relates to the SFCOM IWks::ExportToWKT() method. For backward compatibility purposes, it exports the Oldstyle 99402 extended dimension (Z) WKB types for types Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon and GeometryCollection. For other geometry types, it is equivalent to OGR_G_ExportToIsoWkt(). This function is the same as the CPP method OGRGeometry::exportToWkt(). Parameters:  hGeom: handle on the geometry to convert to a text format from. ppszSrcText: a text buffer is allocated by the program, and assigned to the passed pointer. After use, *ppszDstText should be freed with CPLFree(). Currently OGRERR_NONE is always returned. 
ExportToIsoWkt(Geometry self) > OGRErr OGRErr OGR_G_ExportToIsoWkt(OGRGeometryH hGeom, char **ppszSrcText) Convert a geometry into SFSQL 1.2 / ISO SQL/MM Part 3 well known text format. This function relates to the SFCOM IWks::ExportToWKT() method. It exports the SFSQL 1.2 and ISO SQL/MM Part 3 extended dimension (Z&M) WKB types. This function is the same as the CPP method OGRGeometry::exportToWkt(wkbVariantIso). Parameters:  hGeom: handle on the geometry to convert to a text format from. ppszSrcText: a text buffer is allocated by the program, and assigned to the passed pointer. After use, *ppszDstText should be freed with CPLFree(). Currently OGRERR_NONE is always returned. GDAL 2.0 
ExportToWkb(Geometry self, OGRwkbByteOrder byte_order) > OGRErr OGRErr OGR_G_ExportToWkb(OGRGeometryH hGeom, OGRwkbByteOrder eOrder, unsigned char *pabyDstBuffer) Convert a geometry well known binary format. This function relates to the SFCOM IWks::ExportToWKB() method. For backward compatibility purposes, it exports the Oldstyle 99402 extended dimension (Z) WKB types for types Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon and GeometryCollection. For other geometry types, it is equivalent to OGR_G_ExportToIsoWkb(). This function is the same as the CPP method OGRGeometry::exportToWkb(OGRwkbByteOrder, unsigned char *, OGRwkbVariant) with eWkbVariant = wkbVariantOldOgc. Parameters:  hGeom: handle on the geometry to convert to a well know binary data from. eOrder: One of wkbXDR or wkbNDR indicating MSB or LSB byte order respectively. pabyDstBuffer: a buffer into which the binary representation is written. This buffer must be at least OGR_G_WkbSize() byte in size. Currently OGRERR_NONE is always returned. 
ExportToIsoWkb(Geometry self, OGRwkbByteOrder byte_order) > OGRErr OGRErr OGR_G_ExportToIsoWkb(OGRGeometryH hGeom, OGRwkbByteOrder eOrder, unsigned char *pabyDstBuffer) Convert a geometry into SFSQL 1.2 / ISO SQL/MM Part 3 well known binary format. This function relates to the SFCOM IWks::ExportToWKB() method. It exports the SFSQL 1.2 and ISO SQL/MM Part 3 extended dimension (Z&M) WKB types. This function is the same as the CPP method OGRGeometry::exportToWkb(OGRwkbByteOrder, unsigned char *, OGRwkbVariant) with eWkbVariant = wkbVariantIso. Parameters:  hGeom: handle on the geometry to convert to a well know binary data from. eOrder: One of wkbXDR or wkbNDR indicating MSB or LSB byte order respectively. pabyDstBuffer: a buffer into which the binary representation is written. This buffer must be at least OGR_G_WkbSize() byte in size. Currently OGRERR_NONE is always returned. GDAL 2.0 
Clone(Geometry self) > Geometry OGRGeometryH OGR_G_Clone(OGRGeometryH hGeom) Make a copy of this object. This function relates to the SFCOM IGeometry::clone() method. This function is the same as the CPP method OGRGeometry::clone(). Parameters:  hGeom: handle on the geometry to clone from. a handle on the copy of the geometry with the spatial reference system as the original. 
GetGeometryType(Geometry self) > OGRwkbGeometryType OGRwkbGeometryType OGR_G_GetGeometryType(OGRGeometryH hGeom) 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 function is the same as the CPP method OGRGeometry::getGeometryType(). Parameters:  hGeom: handle on the geometry to get type from. the geometry type code. 
GetGeometryName(Geometry self) > char const * const char* OGR_G_GetGeometryName(OGRGeometryH hGeom) Fetch WKT name for geometry type. There is no SFCOM analog to this function. This function is the same as the CPP method OGRGeometry::getGeometryName(). Parameters:  hGeom: handle on the geometry to get name from. name used for this geometry type in well known text format. 
SwapXY(Geometry self) void OGR_G_SwapXY(OGRGeometryH hGeom) Swap x and y coordinates. Parameters:  hGeom: geometry. OGR 2.3.0 
Simplify(Geometry self, double tolerance) > Geometry OGRGeometryH OGR_G_Simplify(OGRGeometryH hThis, double dTolerance) Compute a simplified geometry. This function is the same as the C++ method OGRGeometry::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:  hThis: the geometry. dTolerance: the distance tolerance for the simplification. the simplified geometry or NULL if an error occurs. OGR 1.8.0 
SimplifyPreserveTopology(Geometry self, double tolerance) > Geometry OGRGeometryH OGR_G_SimplifyPreserveTopology(OGRGeometryH hThis, double dTolerance) Simplify the geometry while preserving topology. This function is the same as the C++ method OGRGeometry::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:  hThis: the geometry. dTolerance: the distance tolerance for the simplification. the simplified geometry or NULL if an error occurs. OGR 1.9.0 
DelaunayTriangulation(Geometry self, double dfTolerance=0.0, int bOnlyEdges=False) > Geometry OGRGeometryH OGR_G_DelaunayTriangulation(OGRGeometryH hThis, double dfTolerance, int bOnlyEdges) Return a Delaunay triangulation of the vertices of the geometry. This function is the same as the C++ method OGRGeometry::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:  hThis: the geometry. dfTolerance: optional snapping tolerance to use for improved robustness bOnlyEdges: if TRUE, will return a MULTILINESTRING, otherwise it will return a GEOMETRYCOLLECTION containing triangular POLYGONs. the geometry resulting from the Delaunay triangulation or NULL if an error occurs. OGR 2.1 
Polygonize(Geometry self) > Geometry OGRGeometryH OGR_G_Polygonize(OGRGeometryH hTarget) 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 function is the same as the C++ method OGRGeometry::Polygonize(). 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:  hTarget: The Geometry to be polygonized. a handle to a newly allocated geometry now owned by the caller, or NULL on failure. OGR 1.9.0 
Boundary(Geometry self) > Geometry OGRGeometryH OGR_G_Boundary(OGRGeometryH hTarget) Compute boundary. A new geometry object is created and returned containing the boundary of the geometry on which the method is invoked. This function is the same as the C++ method OGR_G_Boundary(). 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:  hTarget: The Geometry to calculate the boundary of. a handle to a newly allocated geometry now owned by the caller, or NULL on failure. OGR 1.8.0 
GetBoundary(Geometry self) > Geometry OGRGeometryH OGR_G_GetBoundary(OGRGeometryH hTarget) Compute boundary (deprecated) Deprecated See: OGR_G_Boundary() 
ConvexHull(Geometry self) > Geometry OGRGeometryH OGR_G_ConvexHull(OGRGeometryH hTarget) 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 function is the same as the C++ method OGRGeometry::ConvexHull(). 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:  hTarget: The Geometry to calculate the convex hull of. a handle to a newly allocated geometry now owned by the caller, or NULL on failure. 
MakeValid(Geometry self) > Geometry OGRGeometryH OGR_G_MakeValid(OGRGeometryH hGeom) Attempts to make an invalid geometry valid without losing vertices. Alreadyvalid geometries are cloned without further intervention. This function is the same as the C++ method OGRGeometry::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:  hGeom: The Geometry to make valid. a newly allocated geometry now owned by the caller, or NULL on failure. GDAL 3.0 
Buffer(Geometry self, double distance, int quadsecs=30) > Geometry OGRGeometryH OGR_G_Buffer(OGRGeometryH hTarget, double dfDist, int nQuadSegs) 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 function is the same as the C++ method OGRGeometry::Buffer(). 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:  hTarget: the geometry. dfDist: the buffer distance to be applied. Should be expressed into the same unit as the coordinates of the geometry. nQuadSegs: the number of segments used to approximate a 90 degree (quadrant) of curvature. the newly created geometry, or NULL if an error occurs. 
Intersection(Geometry self, Geometry other) > Geometry OGRGeometryH OGR_G_Intersection(OGRGeometryH hThis, OGRGeometryH hOther) Compute intersection. Generates a new geometry which is the region of intersection of the two geometries operated on. The OGR_G_Intersects() function 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 function is the same as the C++ method OGRGeometry::Intersection(). 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:  hThis: the geometry. hOther: the other geometry. a new geometry representing the intersection or NULL if there is no intersection or an error occurs. 
Union(Geometry self, Geometry other) > Geometry OGRGeometryH OGR_G_Union(OGRGeometryH hThis, OGRGeometryH hOther) 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 function is the same as the C++ method OGRGeometry::Union(). 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:  hThis: the geometry. hOther: the other geometry. a new geometry representing the union or NULL if an error occurs. 
UnionCascaded(Geometry self) > Geometry OGRGeometryH OGR_G_UnionCascaded(OGRGeometryH hThis) 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. This function is the same as the C++ method OGRGeometry::UnionCascaded(). 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:  hThis: the geometry. a new geometry representing the union or NULL if an error occurs. 
Difference(Geometry self, Geometry other) > Geometry OGRGeometryH OGR_G_Difference(OGRGeometryH hThis, OGRGeometryH hOther) Compute difference. Generates a new geometry which is the region of this geometry with the region of the other 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 function is the same as the C++ method OGRGeometry::Difference(). 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:  hThis: the geometry. hOther: the other geometry. a new geometry representing the difference or NULL if the difference is empty or an error occurs. 
SymDifference(Geometry self, Geometry other) > Geometry OGRGeometryH OGR_G_SymDifference(OGRGeometryH hThis, OGRGeometryH hOther) Compute symmetric difference. Generates a new geometry which is the symmetric difference of this geometry and the other 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 function is the same as the C++ method OGRGeometry::SymmetricDifference(). 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:  hThis: the geometry. hOther: the other geometry. a new geometry representing the symmetric difference or NULL if the difference is empty or an error occurs. OGR 1.8.0 
SymmetricDifference(Geometry self, Geometry other) > Geometry OGRGeometryH OGR_G_SymmetricDifference(OGRGeometryH hThis, OGRGeometryH hOther) Compute symmetric difference (deprecated) Deprecated See: OGR_G_SymmetricDifference() 
Distance(Geometry self, Geometry other) > double double OGR_G_Distance(OGRGeometryH hFirst, OGRGeometryH hOther) 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 function is the same as the C++ method OGRGeometry::Distance(). 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:  hFirst: the first geometry to compare against. hOther: the other geometry to compare against. the distance between the geometries or 1 if an error occurs. 
Distance3D(Geometry self, Geometry other) > double double OGR_G_Distance3D(OGRGeometryH hFirst, OGRGeometryH hOther) 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++ method OGRGeometry::Distance3D(). Parameters:  hFirst: the first geometry to compare against. hOther: the other geometry to compare against. distance between the two geometries GDAL 2.2 the distance between the geometries or 1 if an error occurs. 
Empty(Geometry self) void OGR_G_Empty(OGRGeometryH hGeom) Clear geometry information. This restores the geometry to its initial state after construction, and before assignment of actual geometry. This function relates to the SFCOM IGeometry::Empty() method. This function is the same as the CPP method OGRGeometry::empty(). Parameters:  hGeom: handle on the geometry to empty. 
IsEmpty(Geometry self) > bool int OGR_G_IsEmpty(OGRGeometryH hGeom) Test if the geometry is empty. This method is the same as the CPP method OGRGeometry::IsEmpty(). Parameters:  hGeom: The Geometry to test. TRUE if the geometry has no points, otherwise FALSE. 
IsValid(Geometry self) > bool int OGR_G_IsValid(OGRGeometryH hGeom) Test if the geometry is valid. This function is the same as the C++ method OGRGeometry::IsValid(). 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 return FALSE. Parameters:  hGeom: The Geometry to test. TRUE if the geometry has no points, otherwise FALSE. 
IsSimple(Geometry self) > bool int OGR_G_IsSimple(OGRGeometryH hGeom) Returns TRUE if the geometry is simple. Returns TRUE if the geometry has no anomalous geometric points, such as self intersection or self tangency. The description of each instantiable geometric class will include the specific conditions that cause an instance of that class to be classified as not simple. This function is the same as the C++ method OGRGeometry::IsSimple() method. If OGR is built without the GEOS library, this function will always return FALSE. Parameters:  hGeom: The Geometry to test. TRUE if object is simple, otherwise FALSE. 
IsRing(Geometry self) > bool int OGR_G_IsRing(OGRGeometryH hGeom) Test if the geometry is a ring. This function is the same as the C++ method OGRGeometry::IsRing(). 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 return FALSE. Parameters:  hGeom: The Geometry to test. TRUE if the geometry has no points, otherwise FALSE. 
Intersects(Geometry self, Geometry other) > bool int OGR_G_Intersects(OGRGeometryH hGeom, OGRGeometryH hOtherGeom) 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. This function is the same as the CPP method OGRGeometry::Intersects. Parameters:  hGeom: handle on the first geometry. hOtherGeom: handle on the other geometry to test against. TRUE if the geometries intersect, otherwise FALSE. 
Equals(Geometry self, Geometry other) > bool int OGR_G_Equals(OGRGeometryH hGeom, OGRGeometryH hOther) 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 subgeometries 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 function is the same as the CPP method OGRGeometry::Equals() method. Parameters:  hGeom: handle on the first geometry. hOther: handle on the other geometry to test against. TRUE if equivalent or FALSE otherwise. 
Disjoint(Geometry self, Geometry other) > bool int OGR_G_Disjoint(OGRGeometryH hThis, OGRGeometryH hOther) Test for disjointness. Tests if this geometry and the other geometry 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 function is the same as the C++ method OGRGeometry::Disjoint(). 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:  hThis: the geometry to compare. hOther: the other geometry to compare. TRUE if they are disjoint, otherwise FALSE. 
Touches(Geometry self, Geometry other) > bool int OGR_G_Touches(OGRGeometryH hThis, OGRGeometryH hOther) Test for touching. Tests if this geometry and the other geometry 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 function is the same as the C++ method OGRGeometry::Touches(). 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:  hThis: the geometry to compare. hOther: the other geometry to compare. TRUE if they are touching, otherwise FALSE. 
Crosses(Geometry self, Geometry other) > bool int OGR_G_Crosses(OGRGeometryH hThis, OGRGeometryH hOther) Test for crossing. Tests if this geometry and the other geometry 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 function is the same as the C++ method OGRGeometry::Crosses(). 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:  hThis: the geometry to compare. hOther: the other geometry to compare. TRUE if they are crossing, otherwise FALSE. 
Within(Geometry self, Geometry other) > bool int OGR_G_Within(OGRGeometryH hThis, OGRGeometryH hOther) Test for containment. Tests if this geometry is within the other 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 function is the same as the C++ method OGRGeometry::Within(). 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:  hThis: the geometry to compare. hOther: the other geometry to compare. TRUE if hThis is within hOther, otherwise FALSE. 
Contains(Geometry self, Geometry other) > bool int OGR_G_Contains(OGRGeometryH hThis, OGRGeometryH hOther) Test for containment. Tests if this geometry contains the other 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 function is the same as the C++ method OGRGeometry::Contains(). 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:  hThis: the geometry to compare. hOther: the other geometry to compare. TRUE if hThis contains hOther geometry, otherwise FALSE. 
Overlaps(Geometry self, Geometry other) > bool int OGR_G_Overlaps(OGRGeometryH hThis, OGRGeometryH hOther) Test for overlap. Tests if this geometry and the other geometry overlap, that is their intersection has a nonzero 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 function is the same as the C++ method OGRGeometry::Overlaps(). 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:  hThis: the geometry to compare. hOther: the other geometry to compare. TRUE if they are overlapping, otherwise FALSE. 
TransformTo(Geometry self, SpatialReference reference) > OGRErr OGRErr OGR_G_TransformTo(OGRGeometryH hGeom, OGRSpatialReferenceH hSRS) Transform geometry to new spatial reference system. This function 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 function 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 function requires internal creation and initialization of an OGRCoordinateTransformation object it is significantly more expensive to use this function to transform many geometries than it is to create the OGRCoordinateTransformation in advance, and call transform() with that transformation. This function exists primarily for convenience when only transforming a single geometry. This function is the same as the CPP method OGRGeometry::transformTo. Parameters:  hGeom: handle on the geometry to apply the transform to. hSRS: handle on the spatial reference system to apply. OGRERR_NONE on success, or an error code. 
GetSpatialReference(Geometry self) > SpatialReference OGRSpatialReferenceH OGR_G_GetSpatialReference(OGRGeometryH hGeom) Returns spatial reference system for geometry. This function relates to the SFCOM IGeometry::get_SpatialReference() method. This function is the same as the CPP method OGRGeometry::getSpatialReference(). Parameters:  hGeom: handle on the geometry to get spatial reference from. a reference to the spatial reference geometry. 
AssignSpatialReference(Geometry self, SpatialReference reference) void OGR_G_AssignSpatialReference(OGRGeometryH hGeom, OGRSpatialReferenceH hSRS) 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 subgeometries of the geometry ( OGRGeometryCollection, OGRCurvePolygon/OGRPolygon, OGRCompoundCurve, OGRPolyhedralSurface and their derived classes). This is similar to the SFCOM IGeometry::put_SpatialReference() method. This function is the same as the CPP method OGRGeometry::assignSpatialReference. Parameters:  hGeom: handle on the geometry to apply the new spatial reference system. hSRS: handle on the new spatial reference system to apply. 
CloseRings(Geometry self) void OGR_G_CloseRings(OGRGeometryH hGeom) 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. Parameters:  hGeom: handle to the geometry. 
FlattenTo2D(Geometry self) void OGR_G_FlattenTo2D(OGRGeometryH hGeom) Convert geometry to strictly 2D. In a sense this converts all Z coordinates to 0.0. This function is the same as the CPP method OGRGeometry::flattenTo2D(). Parameters:  hGeom: handle on the geometry to convert. 
Segmentize(Geometry self, double dfMaxLength) void OGR_G_Segmentize(OGRGeometryH hGeom, double dfMaxLength) Modify the geometry such it has no segment longer then the given distance. 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 CPP method OGRGeometry::segmentize(). Parameters:  hGeom: handle on the geometry to segmentize dfMaxLength: the maximum distance between 2 points after segmentization 
GetEnvelope(Geometry self) void OGR_G_GetEnvelope(OGRGeometryH hGeom, OGREnvelope *psEnvelope) Computes and returns the bounding envelope for this geometry in the passed psEnvelope structure. This function is the same as the CPP method OGRGeometry::getEnvelope(). Parameters:  hGeom: handle of the geometry to get envelope from. psEnvelope: the structure in which to place the results. 
GetEnvelope3D(Geometry self) void OGR_G_GetEnvelope3D(OGRGeometryH hGeom, OGREnvelope3D *psEnvelope) Computes and returns the bounding envelope (3D) for this geometry in the passed psEnvelope structure. This function is the same as the CPP method OGRGeometry::getEnvelope(). Parameters:  hGeom: handle of the geometry to get envelope from. psEnvelope: the structure in which to place the results. OGR 1.9.0 
Centroid(Geometry self) > Geometry int OGR_G_Centroid(OGRGeometryH hGeom, OGRGeometryH hCentroidPoint) 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/MMPart 3 defines the operation for surfaces and multisurfaces (multipolygons). This function is the same as the C++ method OGRGeometry::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. OGRERR_NONE on success or OGRERR_FAILURE on error. 
PointOnSurface(Geometry self) > Geometry OGRGeometryH OGR_G_PointOnSurface(OGRGeometryH hGeom) Returns a point guaranteed to lie on the surface. This method relates to the SFCOM ISurface::get_PointOnSurface() method however the current implementation based on GEOS can operate on other geometry types than the types that are supported by SQL/MMPart 3 : surfaces (polygons) and multisurfaces (multipolygons). 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:  hGeom: the geometry to operate on. a point guaranteed to lie on the surface or NULL if an error occurred. OGR 1.10 
WkbSize(Geometry self) > int int OGR_G_WkbSize(OGRGeometryH hGeom) Returns size of related binary representation. This function 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 function relates to the SFCOM IWks::WkbSize() method. This function is the same as the CPP method OGRGeometry::WkbSize(). Parameters:  hGeom: handle on the geometry to get the binary size from. size of binary representation in bytes. 
GetCoordinateDimension(Geometry self) > int int OGR_G_GetCoordinateDimension(OGRGeometryH hGeom) Get the dimension of the coordinates in this geometry. This function is the same as the CPP method OGRGeometry::getCoordinateDimension(). Parameters:  hGeom: handle on the geometry to get the dimension of the coordinates from. Deprecated use OGR_G_CoordinateDimension(), OGR_G_Is3D(), or OGR_G_IsMeasured(). this will return 2 or 3. 
CoordinateDimension(Geometry self) > int int OGR_G_CoordinateDimension(OGRGeometryH hGeom) Get the dimension of the coordinates in this geometry. This function is the same as the CPP method OGRGeometry::CoordinateDimension(). Parameters:  hGeom: handle on the geometry to get the dimension of the coordinates from. this will return 2 for XY, 3 for XYZ and XYM, and 4 for XYZM data. GDAL 2.1 
Is3D(Geometry self) > int int OGR_G_Is3D(OGRGeometryH hGeom) See whether this geometry has Z coordinates. This function is the same as the CPP method OGRGeometry::Is3D(). Parameters:  hGeom: handle on the geometry to check whether it has Z coordinates. TRUE if the geometry has Z coordinates. GDAL 2.1 
IsMeasured(Geometry self) > int int OGR_G_IsMeasured(OGRGeometryH hGeom) See whether this geometry is measured. This function is the same as the CPP method OGRGeometry::IsMeasured(). Parameters:  hGeom: handle on the geometry to check whether it is measured. TRUE if the geometry has M coordinates. GDAL 2.1 
SetCoordinateDimension(Geometry self, int dimension) void OGR_G_SetCoordinateDimension(OGRGeometryH hGeom, int nNewDimension) 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 OGR_G_Set3D() or OGR_G_SetMeasured(). Parameters:  hGeom: handle on the geometry to set the dimension of the coordinates. nNewDimension: New coordinate dimension value, either 2 or 3. 
Set3D(Geometry self, int b3D) void OGR_G_Set3D(OGRGeometryH hGeom, int bIs3D) 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:  hGeom: handle on the geometry to set or unset the Z dimension. bIs3D: Should the geometry have a Z dimension, either TRUE or FALSE. GDAL 2.1 
SetMeasured(Geometry self, int bMeasured) void OGR_G_SetMeasured(OGRGeometryH hGeom, int bIsMeasured) 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:  hGeom: handle on the geometry to set or unset the M dimension. bIsMeasured: Should the geometry have a M dimension, either TRUE or FALSE. GDAL 2.1 
GetDimension(Geometry self) > int int OGR_G_GetDimension(OGRGeometryH hGeom) Get the dimension of this geometry. This function corresponds to the SFCOM IGeometry::GetDimension() method. It indicates the dimension of the geometry, but does not indicate the dimension of the underlying space (as indicated by OGR_G_GetCoordinateDimension() function). This function is the same as the CPP method OGRGeometry::getDimension(). Parameters:  hGeom: handle on the geometry to get the dimension from. 0 for points, 1 for lines and 2 for surfaces. 
Transform(Geometry self, CoordinateTransformation trans) > OGRErr Transform(Geometry self, GeomTransformer transformer) > Geometry OGRErr OGR_G_Transform(OGRGeometryH hGeom, OGRCoordinateTransformationH hTransform) Apply arbitrary coordinate transformation to geometry. This function 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 function 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 function is the same as the CPP method OGRGeometry::transform. Parameters:  hGeom: handle on the geometry to apply the transform to. hTransform: handle on the transformation to apply. OGRERR_NONE on success or an error code. 
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