PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual268 / 310• ST_GeometryFromText - Return a specified ST_Geometry value from Well-Known Text representation (WKT). This is analias name for ST_GeomFromText This method implements the SQL/MM specification. SQL-MM 3: 5.1.40• ST_GeometryN - Return the 1-based Nth geometry if the geometry is a GEOMETRYCOLLECTION, MULTIPOINT, MUL-TILINESTRING, MULTICURVE or MULTIPOLYGON. Otherwise, return NULL. This method implements the SQL/MMspecification. SQL-MM 3: 9.1.5• ST_GeometryType - Return the geometry type of the ST_Geometry value. This method implements the SQL/MM specification.SQL-MM 3: 5.1.4• ST_InteriorRingN - Return the Nth interior linestring ring of the polygon geometry. Return NULL if the geometry is not apolygon or the given N is out of range. This method implements the SQL/MM specification. SQL-MM 3: 8.2.6, 8.3.5• ST_Intersection - (T) Returns a geometry that represents the shared portion of geomA and geomB. The geography implementationdoes a transform to geometry to do the intersection and then transform back to WGS84. This method implements theSQL/MM specification. SQL-MM 3: 5.1.18• ST_Intersects - Returns TRUE if the Geometries/Geography "spatially intersect" - (share any portion of space) and FALSE ifthey don’t (they are Disjoint). For geography -- tolerance is 0.00001 meters (so any points that close are considered to intersect)This method implements the SQL/MM specification. SQL-MM 3: 5.1.27• ST_IsClosed - Returns TRUE if the LINESTRING’s start and end points are coincident. This method implements the SQL/MMspecification. SQL-MM 3: 7.1.5, 9.3.3• ST_IsEmpty - Returns true if this Geometry is an empty geometry . If true, then this Geometry represents the empty point set- i.e. GEOMETRYCOLLECTION(EMPTY). This method implements the SQL/MM specification. SQL-MM 3: 5.1.7• ST_IsRing - Returns TRUE if this LINESTRING is both closed and simple. This method implements the SQL/MM specification.SQL-MM 3: 7.1.6• ST_IsSimple - Returns (TRUE) if this Geometry has no anomalous geometric points, such as self intersection or self tangency.This method implements the SQL/MM specification. SQL-MM 3: 5.1.8• ST_IsValid - Returns true if the ST_Geometry is well formed. This method implements the SQL/MM specification. SQL-MM3: 5.1.9• ST_Length - Returns the 2d length of the geometry if it is a linestring or multilinestring. geometry are in units of spatialreference and geography are in meters (default spheroid) This method implements the SQL/MM specification. SQL-MM 3:7.1.2, 9.3.4• ST_LineFromText - Makes a Geometry from WKT representation with the given SRID. If SRID is not given, it defaults to -1.This method implements the SQL/MM specification. SQL-MM 3: 7.2.8• ST_LineFromWKB - Makes a LINESTRING from WKB with the given SRID This method implements the SQL/MM specification.SQL-MM 3: 7.2.9• ST_LinestringFromWKB - Makes a geometry from WKB with the given SRID. This method implements the SQL/MM specification.SQL-MM 3: 7.2.9• ST_M - Return the M coordinate of the point, or NULL if not available. Input must be a point. This method implements theSQL/MM specification.• ST_MLineFromText - Return a specified ST_MultiLineString value from WKT representation. This method implements theSQL/MM specification.SQL-MM 3: 9.4.4• ST_MPointFromText - Makes a Geometry from WKT with the given SRID. If SRID is not give, it defaults to -1. This methodimplements the SQL/MM specification. SQL-MM 3: 9.2.4• ST_MPolyFromText - Makes a MultiPolygon Geometry from WKT with the given SRID. If SRID is not give, it defaults to -1.This method implements the SQL/MM specification. SQL-MM 3: 9.6.4• ST_NumGeometries - If geometry is a GEOMETRYCOLLECTION (or MULTI*) return the number of geometries, otherwisereturn NULL. This method implements the SQL/MM specification. SQL-MM 3: 9.1.4