管理操作函数

 

AddGeometryColumn — Adds a geometry column to an existing table of attributes. By default uses type modifier to define rather than constraints. Pass in false for use_typmod to get old check constraint based behaviorDropGeometryColumn — Removes a geometry column from a spatial table.DropGeometryTable — Drops a table and all its references in geometry_columns.PostGIS_Full_Version — Reports full postgis version and build configuration infos.PostGIS_GEOS_Version — Returns the version number of the GEOS library.PostGIS_Liblwgeom_Version — Returns the version number of the liblwgeom library. This should match the version of PostGIS.PostGIS_LibXML_Version — Returns the version number of the libxml2 library.PostGIS_Lib_Build_Date — Returns build date of the PostGIS library.PostGIS_Lib_Version — Returns the version number of the PostGIS library.PostGIS_PROJ_Version — Returns the version number of the PROJ4 library.PostGIS_Scripts_Build_Date — Returns build date of the PostGIS scripts.PostGIS_Scripts_Installed — Returns version of the postgis scripts installed in this database.PostGIS_Scripts_Released — Returns the version number of the postgis.sql script released with the installed postgis lib.PostGIS_Version — Returns PostGIS version number and compile-time options.Populate_Geometry_Columns — Ensures geometry columns are defined with type modifiers or have appropriate spatial constraints This ensures they will be registered correctly in geometry_columns view. By default will convert all geometry columns with no type modifier to ones with type modifiers. To get old behavior set use_typmod=falseUpdateGeometrySRID — Updates the SRID of all features in a geometry column, geometry_columns metadata and srid. If it was enforced with constraints, the constraints will be updated with new srid constraint. If the old was enforced by type definition, the type definition will be changed.

　　

几何构造器

ST_BdPolyFromText — Construct a Polygon given an arbitrary collection of closed linestrings as a MultiLineString Well-Known text representation.ST_BdMPolyFromText — Construct a MultiPolygon given an arbitrary collection of closed linestrings as a MultiLineString text representation Well-Known text representation.ST_Box2dFromGeoHash — Return a BOX2D from a GeoHash string.ST_GeogFromText — Return a specified geography value from Well-Known Text representation or extended (WKT).ST_GeographyFromText — Return a specified geography value from Well-Known Text representation or extended (WKT).ST_GeogFromWKB — Creates a geography instance from a Well-Known Binary geometry representation (WKB) or extended Well Known Binary (EWKB).ST_GeomFromTWKB — Creates a geometry instance from a TWKB ("Tiny Well-Known Binary") geometry representation.ST_GeomCollFromText — Makes a collection Geometry from collection WKT with the given SRID. If SRID is not given, it defaults to 0.ST_GeomFromEWKB — Return a specified ST_Geometry value from Extended Well-Known Binary representation (EWKB).ST_GeomFromEWKT — Return a specified ST_Geometry value from Extended Well-Known Text representation (EWKT).ST_GeometryFromText — Return a specified ST_Geometry value from Well-Known Text representation (WKT). This is an alias name for ST_GeomFromTextST_GeomFromGeoHash — Return a geometry from a GeoHash string.ST_GeomFromGML — Takes as input GML representation of geometry and outputs a PostGIS geometry objectST_GeomFromGeoJSON — Takes as input a geojson representation of a geometry and outputs a PostGIS geometry objectST_GeomFromKML — Takes as input KML representation of geometry and outputs a PostGIS geometry objectST_GMLToSQL — Return a specified ST_Geometry value from GML representation. This is an alias name for ST_GeomFromGMLST_GeomFromText — Return a specified ST_Geometry value from Well-Known Text representation (WKT).ST_GeomFromWKB — Creates a geometry instance from a Well-Known Binary geometry representation (WKB) and optional SRID.ST_LineFromEncodedPolyline — Creates a LineString from an Encoded Polyline.ST_LineFromMultiPoint — Creates a LineString from a MultiPoint geometry.ST_LineFromText — Makes a Geometry from WKT representation with the given SRID. If SRID is not given, it defaults to 0.ST_LineFromWKB — Makes a LINESTRING from WKB with the given SRIDST_LinestringFromWKB — Makes a geometry from WKB with the given SRID.ST_MakeBox2D — Creates a BOX2D defined by the given point geometries.ST_3DMakeBox — Creates a BOX3D defined by the given 3d point geometries.ST_MakeLine — Creates a Linestring from point, multipoint, or line geometries.ST_MakeEnvelope — Creates a rectangular Polygon formed from the given minimums and maximums. Input values must be in SRS specified by the SRID.ST_MakePolygon — Creates a Polygon formed by the given shell. Input geometries must be closed LINESTRINGS.ST_MakePoint — Creates a 2D,3DZ or 4D point geometry.ST_MakePointM — Creates a point geometry with an x y and m coordinate.ST_MLineFromText — Return a specified ST_MultiLineString value from WKT representation.ST_MPointFromText — Makes a Geometry from WKT with the given SRID. If SRID is not given, it defaults to 0.ST_MPolyFromText — Makes a MultiPolygon Geometry from WKT with the given SRID. If SRID is not given, it defaults to 0.ST_Point — Returns an ST_Point with the given coordinate values. OGC alias for ST_MakePoint.ST_PointFromGeoHash — Return a point from a GeoHash string.ST_PointFromText — Makes a point Geometry from WKT with the given SRID. If SRID is not given, it defaults to unknown.ST_PointFromWKB — Makes a geometry from WKB with the given SRIDST_Polygon — Returns a polygon built from the specified linestring and SRID.ST_PolygonFromText — Makes a Geometry from WKT with the given SRID. If SRID is not given, it defaults to 0.ST_WKBToSQL — Return a specified ST_Geometry value from Well-Known Binary representation (WKB). This is an alias name for ST_GeomFromWKB that takes no sridST_WKTToSQL — Return a specified ST_Geometry value from Well-Known Text representation (WKT). This is an alias name for ST_GeomFromText

　　

几何属性查看

GeometryType — Returns the type of the geometry as a string. Eg: 'LINESTRING', 'POLYGON', 'MULTIPOINT', etc.ST_Boundary — Returns the closure of the combinatorial boundary of this Geometry.ST_CoordDim — Return the coordinate dimension of the ST_Geometry value.ST_Dimension — The inherent dimension of this Geometry object, which must be less than or equal to the coordinate dimension.ST_EndPoint — Returns the last point of a LINESTRING or CIRCULARLINESTRING geometry as a POINT.ST_Envelope — Returns a geometry representing the double precision (float8) bounding box of the supplied geometry.ST_BoundingDiagonal — Returns the diagonal of the supplied geometry's bounding box.ST_ExteriorRing — Returns a line string representing the exterior ring of the POLYGON geometry. Return NULL if the geometry is not a polygon. Will not work with MULTIPOLYGONST_GeometryN — Return the 1-based Nth geometry if the geometry is a GEOMETRYCOLLECTION, (MULTI)POINT, (MULTI)LINESTRING, MULTICURVE or (MULTI)POLYGON, POLYHEDRALSURFACE Otherwise, return NULL.ST_GeometryType — Return the geometry type of the ST_Geometry value.ST_InteriorRingN — Return the Nth interior linestring ring of the polygon geometry. Return NULL if the geometry is not a polygon or the given N is out of range.ST_IsPolygonCCW — Returns true if all exterior rings are oriented counter-clockwise and all interior rings are oriented clockwise.ST_IsPolygonCW — Returns true if all exterior rings are oriented clockwise and all interior rings are oriented counter-clockwise.ST_IsClosed — Returns TRUE if the LINESTRING's start and end points are coincident. For Polyhedral surface is closed (volumetric).ST_IsCollection — Returns TRUE if the argument is a collection (MULTI*, GEOMETRYCOLLECTION, ...)ST_IsEmpty — Returns true if this Geometry is an empty geometrycollection, polygon, point etc.ST_IsRing — Returns TRUE if this LINESTRING is both closed and simple.ST_IsSimple — Returns (TRUE) if this Geometry has no anomalous geometric points, such as self intersection or self tangency.ST_IsValid — Returns true if the ST_Geometry is well formed.ST_IsValidReason — Returns text stating if a geometry is valid or not and if not valid, a reason why.ST_IsValidDetail — Returns a valid_detail (valid,reason,location) row stating if a geometry is valid or not and if not valid, a reason why and a location where.ST_M — Return the M coordinate of the point, or NULL if not available. Input must be a point.ST_NDims — Returns coordinate dimension of the geometry as a small int. Values are: 2,3 or 4.ST_NPoints — Return the number of points (vertexes) in a geometry.ST_NRings — If the geometry is a polygon or multi-polygon returns the number of rings.ST_NumGeometries — If geometry is a GEOMETRYCOLLECTION (or MULTI*) return the number of geometries, for single geometries will return 1, otherwise return NULL.ST_NumInteriorRings — Return the number of interior rings of a polygon geometry.ST_NumInteriorRing — Return the number of interior rings of a polygon in the geometry. Synonym for ST_NumInteriorRings.ST_NumPatches — Return the number of faces on a Polyhedral Surface. Will return null for non-polyhedral geometries.ST_NumPoints — Return the number of points in an ST_LineString or ST_CircularString value.ST_PatchN — Return the 1-based Nth geometry (face) if the geometry is a POLYHEDRALSURFACE, POLYHEDRALSURFACEM. Otherwise, return NULL.ST_PointN — Return the Nth point in the first LineString or circular LineString in the geometry. Negative values are counted backwards from the end of the LineString. Returns NULL if there is no linestring in the geometry.ST_Points — Returns a MultiPoint containing all of the coordinates of a geometry.ST_SRID — Returns the spatial reference identifier for the ST_Geometry as defined in spatial_ref_sys table.ST_StartPoint — Returns the first point of a LINESTRING geometry as a POINT.ST_Summary — Returns a text summary of the contents of the geometry.ST_X — Return the X coordinate of the point, or NULL if not available. Input must be a point.ST_XMax — Returns X maxima of a bounding box 2d or 3d or a geometry.ST_XMin — Returns X minima of a bounding box 2d or 3d or a geometry.ST_Y — Return the Y coordinate of the point, or NULL if not available. Input must be a point.ST_YMax — Returns Y maxima of a bounding box 2d or 3d or a geometry.ST_YMin — Returns Y minima of a bounding box 2d or 3d or a geometry.ST_Z — Return the Z coordinate of the point, or NULL if not available. Input must be a point.ST_ZMax — Returns Z minima of a bounding box 2d or 3d or a geometry.ST_Zmflag — Returns ZM (dimension semantic) flag of the geometries as a small int. Values are: 0=2d, 1=3dm, 2=3dz, 3=4d.ST_ZMin — Returns Z minima of a bounding box 2d or 3d or a geometry.

　　

几何编辑

ST_AddPoint — Add a point to a LineString.ST_Affine — Apply a 3d affine transformation to a geometry.ST_Force2D — Force the geometries into a "2-dimensional mode".ST_Force3D — Force the geometries into XYZ mode. This is an alias for ST_Force3DZ.ST_Force3DZ — Force the geometries into XYZ mode.ST_Force3DM — Force the geometries into XYM mode.ST_Force4D — Force the geometries into XYZM mode.ST_ForcePolygonCCW — Orients all exterior rings counter-clockwise and all interior rings clockwise.ST_ForceCollection — Convert the geometry into a GEOMETRYCOLLECTION.ST_ForcePolygonCW — Orients all exterior rings clockwise and all interior rings counter-clockwise.ST_ForceSFS — Force the geometries to use SFS 1.1 geometry types only.ST_ForceRHR — Force the orientation of the vertices in a polygon to follow the Right-Hand-Rule.ST_ForceCurve — Upcast a geometry into its curved type, if applicable.ST_LineMerge — Return a (set of) LineString(s) formed by sewing together a MULTILINESTRING.ST_CollectionExtract — Given a (multi)geometry, return a (multi)geometry consisting only of elements of the specified type.ST_CollectionHomogenize — Given a geometry collection, return the "simplest" representation of the contents.ST_Multi — Return the geometry as a MULTI* geometry.ST_Normalize — Return the geometry in its canonical form.ST_RemovePoint — Remove point from a linestring.ST_Reverse — Return the geometry with vertex order reversed.ST_Rotate — Rotate a geometry rotRadians counter-clockwise about an origin.ST_RotateX — Rotate a geometry rotRadians about the X axis.ST_RotateY — Rotate a geometry rotRadians about the Y axis.ST_RotateZ — Rotate a geometry rotRadians about the Z axis.ST_Scale — Scale a geometry by given factors.ST_Segmentize — Return a modified geometry/geography having no segment longer than the given distance.ST_SetPoint — Replace point of a linestring with a given point.ST_SetSRID — Set the SRID on a geometry to a particular integer value.ST_SnapToGrid — Snap all points of the input geometry to a regular grid.ST_Snap — Snap segments and vertices of input geometry to vertices of a reference geometry.ST_Transform — Return a new geometry with its coordinates transformed to a different spatial reference.ST_Translate — Translate a geometry by given offsets.ST_TransScale — Translate a geometry by given factors and offsets.

　　

几何输出

ST_AsBinary — Return the Well-Known Binary (WKB) representation of the geometry/geography without SRID meta data.ST_AsEncodedPolyline — Returns an Encoded Polyline from a LineString geometry.ST_AsEWKB — Return the Well-Known Binary (WKB) representation of the geometry with SRID meta data.ST_AsEWKT — Return the Well-Known Text (WKT) representation of the geometry with SRID meta data.ST_AsGeoJSON — Return the geometry as a GeoJSON element.ST_AsGML — Return the geometry as a GML version 2 or 3 element.ST_AsHEXEWKB — Returns a Geometry in HEXEWKB format (as text) using either little-endian (NDR) or big-endian (XDR) encoding.ST_AsKML — Return the geometry as a KML element. Several variants. Default version=2, default precision=15ST_AsLatLonText — Return the Degrees, Minutes, Seconds representation of the given point.ST_AsSVG — Returns a Geometry in SVG path data given a geometry or geography object.ST_AsText — Return the Well-Known Text (WKT) representation of the geometry/geography without SRID metadata.ST_AsTWKB — Returns the geometry as TWKB, aka "Tiny Well-Known Binary"ST_AsX3D — Returns a Geometry in X3D xml node element format: ISO-IEC-19776-1.2-X3DEncodings-XMLST_GeoHash — Return a GeoHash representation of the geometry.ST_AsGeobuf — Return a Geobuf representation of a set of rows.ST_AsMVTGeom — Transform a geometry into the coordinate space of a Mapbox Vector Tile.ST_AsMVT — Return a Mapbox Vector Tile representation of a set of rows.

　　

几何操作

&& — Returns TRUE if A's 2D bounding box intersects B's 2D bounding box.&&(geometry,box2df) — Returns TRUE if a geometry's (cached) 2D bounding box intersects a 2D float precision bounding box (BOX2DF).&&(box2df,geometry) — Returns TRUE if a 2D float precision bounding box (BOX2DF) intersects a geometry's (cached) 2D bounding box.&&(box2df,box2df) — Returns TRUE if two 2D float precision bounding boxes (BOX2DF) intersect each other.&&& — Returns TRUE if A's n-D bounding box intersects B's n-D bounding box.&&&(geometry,gidx) — Returns TRUE if a geometry's (cached) n-D bounding box intersects a n-D float precision bounding box (GIDX).&&&(gidx,geometry) — Returns TRUE if a n-D float precision bounding box (GIDX) intersects a geometry's (cached) n-D bounding box.&&&(gidx,gidx) — Returns TRUE if two n-D float precision bounding boxes (GIDX) intersect each other.&< — Returns TRUE if A's bounding box overlaps or is to the left of B's.&<| — Returns TRUE if A's bounding box overlaps or is below B's.&> — Returns TRUE if A' bounding box overlaps or is to the right of B's.<< — Returns TRUE if A's bounding box is strictly to the left of B's.<<| — Returns TRUE if A's bounding box is strictly below B's.= — Returns TRUE if the coordinates and coordinate order geometry/geography A are the same as the coordinates and coordinate order of geometry/geography B.>> — Returns TRUE if A's bounding box is strictly to the right of B's.@ — Returns TRUE if A's bounding box is contained by B's.@(geometry,box2df) — Returns TRUE if a geometry's 2D bounding box is contained into a 2D float precision bounding box (BOX2DF).@(box2df,geometry) — Returns TRUE if a 2D float precision bounding box (BOX2DF) is contained into a geometry's 2D bounding box.@(box2df,box2df) — Returns TRUE if a 2D float precision bounding box (BOX2DF) is contained into another 2D float precision bounding box.|&> — Returns TRUE if A's bounding box overlaps or is above B's.|>> — Returns TRUE if A's bounding box is strictly above B's.~ — Returns TRUE if A's bounding box contains B's.~(geometry,box2df) — Returns TRUE if a geometry's 2D bonding box contains a 2D float precision bounding box (GIDX).~(box2df,geometry) — Returns TRUE if a 2D float precision bounding box (BOX2DF) contains a geometry's 2D bonding box.~(box2df,box2df) — Returns TRUE if a 2D float precision bounding box (BOX2DF) contains another 2D float precision bounding box (BOX2DF).~= — Returns TRUE if A's bounding box is the same as B's.<-> — Returns the 2D distance between A and B.|=| — Returns the distance between A and B trajectories at their closest point of approach.<#> — Returns the 2D distance between A and B bounding boxes.<<->> — Returns the n-D distance between the centroids of A and B bounding boxes.<<#>> — Returns the n-D distance between A and B bounding boxes.

　　

地理关系测量

ST_3DClosestPoint — Returns the 3-dimensional point on g1 that is closest to g2. This is the first point of the 3D shortest line.ST_3DDistance — For geometry type Returns the 3-dimensional cartesian minimum distance (based on spatial ref) between two geometries in projected units.ST_3DDWithin — For 3d (z) geometry type Returns true if two geometries 3d distance is within number of units.ST_3DDFullyWithin — Returns true if all of the 3D geometries are within the specified distance of one another.ST_3DIntersects — Returns TRUE if the Geometries "spatially intersect" in 3d - only for points, linestrings, polygons, polyhedral surface (area). With SFCGAL backend enabled also supports TINSST_3DLongestLine — Returns the 3-dimensional longest line between two geometriesST_3DMaxDistance — For geometry type Returns the 3-dimensional cartesian maximum distance (based on spatial ref) between two geometries in projected units.ST_3DShortestLine — Returns the 3-dimensional shortest line between two geometriesST_Area — Returns the area of the surface if it is a Polygon or MultiPolygon. For geometry, a 2D Cartesian area is determined with units specified by the SRID. For geography, area is determined on a curved surface with units in square meters.ST_Azimuth — Returns the north-based azimuth as the angle in radians measured clockwise from the vertical on pointA to pointB.ST_Centroid — Returns the geometric center of a geometry.ST_ClosestPoint — Returns the 2-dimensional point on g1 that is closest to g2. This is the first point of the shortest line.ST_ClusterDBSCAN — Windowing function that returns integer id for the cluster each input geometry is in based on 2D implementation of Density-based spatial clustering of applications with noise (DBSCAN) algorithm.ST_ClusterIntersecting — Aggregate. Returns an array with the connected components of a set of geometriesST_ClusterKMeans — Windowing function that returns integer id for the cluster each input geometry is in.ST_ClusterWithin — Aggregate. Returns an array of GeometryCollections, where each GeometryCollection represents a set of geometries separated by no more than the specified distance.ST_Contains — Returns true if and only if no points of B lie in the exterior of A, and at least one point of the interior of B lies in the interior of A.ST_ContainsProperly — Returns true if B intersects the interior of A but not the boundary (or exterior). A does not contain properly itself, but does contain itself.ST_Covers — Returns 1 (TRUE) if no point in Geometry B is outside Geometry AST_CoveredBy — Returns 1 (TRUE) if no point in Geometry/Geography A is outside Geometry/Geography BST_Crosses — Returns TRUE if the supplied geometries have some, but not all, interior points in common.ST_LineCrossingDirection — Given 2 linestrings, returns a number between -3 and 3 denoting what kind of crossing behavior. 0 is no crossing.ST_Disjoint — Returns TRUE if the Geometries do not "spatially intersect" - if they do not share any space together.ST_Distance — For geometry type Returns the 2D Cartesian distance between two geometries in projected units (based on spatial ref). For geography type defaults to return minimum geodesic distance between two geographies in meters.ST_MinimumClearance — Returns the minimum clearance of a geometry, a measure of a geometry's robustness.ST_MinimumClearanceLine — Returns the two-point LineString spanning a geometry's minimum clearance.ST_HausdorffDistance — Returns the Hausdorff distance between two geometries. Basically a measure of how similar or dissimilar 2 geometries are. Units are in the units of the spatial reference system of the geometries.ST_FrechetDistance — Returns the Fréchet distance between two geometries. This is a measure of similarity between curves that takes into account the location and ordering of the points along the curves. Units are in the units of the spatial reference system of the geometries.ST_MaxDistance — Returns the 2-dimensional largest distance between two geometries in projected units.ST_DistanceSphere — Returns minimum distance in meters between two lon/lat geometries. Uses a spherical earth and radius derived from the spheroid defined by the SRID. Faster than ST_DistanceSpheroid ST_DistanceSpheroid, but less accurate. PostGIS versions prior to 1.5 only implemented for points.ST_DistanceSpheroid — Returns the minimum distance between two lon/lat geometries given a particular spheroid. PostGIS versions prior to 1.5 only support points.ST_DFullyWithin — Returns true if all of the geometries are within the specified distance of one anotherST_DWithin — Returns true if the geometries are within the specified distance of one another. For geometry units are in those of spatial reference and For geography units are in meters and measurement is defaulted to use_spheroid=true (measure around spheroid), for faster check, use_spheroid=false to measure along sphere.ST_Equals — Returns true if the given geometries represent the same geometry. Directionality is ignored.ST_GeometricMedian — Returns the geometric median of a MultiPoint.ST_HasArc — Returns true if a geometry or geometry collection contains a circular stringST_Intersects — Returns TRUE if the Geometries/Geography "spatially intersect in 2D" - (share any portion of space) and FALSE if they don't (they are Disjoint). For geography -- tolerance is 0.00001 meters (so any points that close are considered to intersect)ST_Length — Returns the 2D length of the geometry if it is a LineString or MultiLineString. geometry are in units of spatial reference and geography are in meters (default spheroid)ST_Length2D — Returns the 2-dimensional length of the geometry if it is a linestring or multi-linestring. This is an alias for ST_LengthST_3DLength — Returns the 3-dimensional or 2-dimensional length of the geometry if it is a linestring or multi-linestring.ST_LengthSpheroid — Calculates the 2D or 3D length/perimeter of a geometry on an ellipsoid. This is useful if the coordinates of the geometry are in longitude/latitude and a length is desired without reprojection.ST_Length2D_Spheroid — Calculates the 2D length/perimeter of a geometry on an ellipsoid. This is useful if the coordinates of the geometry are in longitude/latitude and a length is desired without reprojection.ST_LongestLine — Returns the 2-dimensional longest line points of two geometries. The function will only return the first longest line if more than one, that the function finds. The line returned will always start in g1 and end in g2. The length of the line this function returns will always be the same as st_maxdistance returns for g1 and g2.ST_OrderingEquals — Returns true if the given geometries represent the same geometry and points are in the same directional order.ST_Overlaps — Returns TRUE if the Geometries share space, are of the same dimension, but are not completely contained by each other.ST_Perimeter — Return the length measurement of the boundary of an ST_Surface or ST_MultiSurface geometry or geography. (Polygon, MultiPolygon). geometry measurement is in units of spatial reference and geography is in meters.ST_Perimeter2D — Returns the 2-dimensional perimeter of the geometry, if it is a polygon or multi-polygon. This is currently an alias for ST_Perimeter.ST_3DPerimeter — Returns the 3-dimensional perimeter of the geometry, if it is a polygon or multi-polygon.ST_PointOnSurface — Returns a POINT guaranteed to lie on the surface.ST_Project — Returns a POINT projected from a start point using a distance in meters and bearing (azimuth) in radians.ST_Relate — Returns true if this Geometry is spatially related to anotherGeometry, by testing for intersections between the Interior, Boundary and Exterior of the two geometries as specified by the values in the intersectionMatrixPattern. If no intersectionMatrixPattern is passed in, then returns the maximum intersectionMatrixPattern that relates the 2 geometries.ST_RelateMatch — Returns true if intersectionMattrixPattern1 implies intersectionMatrixPattern2ST_ShortestLine — Returns the 2-dimensional shortest line between two geometriesST_Touches — Returns TRUE if the geometries have at least one point in common, but their interiors do not intersect.ST_Within — Returns true if the geometry A is completely inside geometry B

　　

几何处理

ST_Buffer — (T) Returns a geometry covering all points within a given distance from the input geometry.ST_BuildArea — Creates an areal geometry formed by the constituent linework of given geometryST_ClipByBox2D — Returns the portion of a geometry falling within a rectangle.ST_Collect — Return a specified ST_Geometry value from a collection of other geometries.ST_ConcaveHull — The concave hull of a geometry represents a possibly concave geometry that encloses all geometries within the set. You can think of it as shrink wrapping.ST_ConvexHull — The convex hull of a geometry represents the minimum convex geometry that encloses all geometries within the set.ST_CurveToLine — Converts a CIRCULARSTRING/CURVEPOLYGON to a LINESTRING/POLYGONST_DelaunayTriangles — Return a Delaunay triangulation around the given input points.ST_Difference — Returns a geometry that represents that part of geometry A that does not intersect with geometry B.ST_Dump — Returns a set of geometry_dump (geom,path) rows, that make up a geometry g1.ST_DumpPoints — Returns a set of geometry_dump (geom,path) rows of all points that make up a geometry.ST_DumpRings — Returns a set of geometry_dump rows, representing the exterior and interior rings of a polygon.ST_FlipCoordinates — Returns a version of the given geometry with X and Y axis flipped. Useful for people who have built latitude/longitude features and need to fix them.ST_GeneratePoints — Converts a polygon or multi-polygon into a multi-point composed of randomly location points within the original areas.ST_Intersection — (T) Returns a geometry that represents the shared portion of geomA and geomB.ST_LineToCurve — Converts a LINESTRING/POLYGON to a CIRCULARSTRING, CURVEPOLYGONST_MakeValid — Attempts to make an invalid geometry valid without losing vertices.ST_MemUnion — Same as ST_Union, only memory-friendly (uses less memory and more processor time).ST_MinimumBoundingCircle — Returns the smallest circle polygon that can fully contain a geometry. Default uses 48 segments per quarter circle.ST_MinimumBoundingRadius — Returns the center point and radius of the smallest circle that can fully contain a geometry.ST_Polygonize — Aggregate. Creates a GeometryCollection containing possible polygons formed from the constituent linework of a set of geometries.ST_Node — Node a set of linestrings.ST_OffsetCurve — Return an offset line at a given distance and side from an input line. Useful for computing parallel lines about a center lineST_RemoveRepeatedPoints — Returns a version of the given geometry with duplicated points removed.ST_SharedPaths — Returns a collection containing paths shared by the two input linestrings/multilinestrings.ST_ShiftLongitude — Toggle geometry coordinates between -180..180 and 0..360 ranges.ST_WrapX — Wrap a geometry around an X value.ST_Simplify — Returns a "simplified" version of the given geometry using the Douglas-Peucker algorithm.ST_SimplifyPreserveTopology — Returns a "simplified" version of the given geometry using the Douglas-Peucker algorithm. Will avoid creating derived geometries (polygons in particular) that are invalid.ST_SimplifyVW — Returns a "simplified" version of the given geometry using the Visvalingam-Whyatt algorithmST_SetEffectiveArea — Sets the effective area for each vertex, storing the value in the M ordinate. A simplified geometry can then be generated by filtering on the M ordinate.ST_Split — Returns a collection of geometries resulting by splitting a geometry.ST_SymDifference — Returns a geometry that represents the portions of A and B that do not intersect. It is called a symmetric difference because ST_SymDifference(A,B) = ST_SymDifference(B,A).ST_Subdivide — Returns a set of geometry where no geometry in the set has more than the specified number of vertices.ST_SwapOrdinates — Returns a version of the given geometry with given ordinate values swapped.ST_Union — Returns a geometry that represents the point set union of the Geometries.ST_UnaryUnion — Like ST_Union, but working at the geometry component level.ST_VoronoiLines — Returns the boundaries between the cells of the Voronoi diagram constructed from the vertices of a geometry.ST_VoronoiPolygons — Returns the cells of the Voronoi diagram constructed from the vertices of a geometry.

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