PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual267 / 310• ST_Boundary - Returns the closure of the combinatorial boundary of this Geometry. This method implements the SQL/MMspecification. SQL-MM 3: 5.1.14• ST_Buffer - (T) For geometry: Returns a geometry that represents all points whose distance from this Geometry is less thanor equal to distance. Calculations are in the Spatial Reference System of this Geometry. For geography: Uses a planartransform wrapper. Introduced in 1.5 support for different end cap and mitre settings to control shape. buffer_style options:quad_segs=#,endcap=round|flat|square,join=round|mitre|bevel,mitre_limit=#.# This method implements the SQL/MM specification.SQL-MM 3: 5.1.17• ST_Centroid - Returns the geometric center of a geometry. This method implements the SQL/MM specification. SQL-MM 3:8.1.4, 9.5.5• 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 liesin the interior of A. This method implements the SQL/MM specification. SQL-MM 3: 5.1.31• ST_ConvexHull - The convex hull of a geometry represents the minimum convex geometry that encloses all geometries withinthe set. This method implements the SQL/MM specification. SQL-MM 3: 5.1.16• ST_CoordDim - Return the coordinate dimension of the ST_Geometry value. This method implements the SQL/MM specification.SQL-MM 3: 5.1.3• ST_Crosses - Returns TRUE if the supplied geometries have some, but not all, interior points in common. This methodimplements the SQL/MM specification. SQL-MM 3: 5.1.29• ST_CurveToLine - Converts a CIRCULARSTRING/CURVEDPOLYGON to a LINESTRING/POLYGON This method implementsthe SQL/MM specification. SQL-MM 3: 7.1.7• ST_Difference - Returns a geometry that represents that part of geometry A that does not intersect with geometry B. Thismethod implements the SQL/MM specification. SQL-MM 3: 5.1.20• ST_Dimension - The inherent dimension of this Geometry object, which must be less than or equal to the coordinate dimension.This method implements the SQL/MM specification. SQL-MM 3: 5.1.2• ST_Disjoint - Returns TRUE if the Geometries do not "spatially intersect" - if they do not share any space together. Thismethod implements the SQL/MM specification. SQL-MM 3: 5.1.26• ST_Distance - For geometry type Returns the 2-dimensional cartesian minimum distance (based on spatial ref) between twogeometries in projected units. For geography type defaults to return spheroidal minimum distance between two geographies inmeters. This method implements the SQL/MM specification. SQL-MM 3: 5.1.23• ST_EndPoint - Returns the last point of a LINESTRING geometry as a POINT. This method implements the SQL/MM specification.SQL-MM 3: 7.1.4• ST_Envelope - Returns a geometry representing the double precision (float8) bounding box of the supplied geometry. Thismethod implements the SQL/MM specification. SQL-MM 3: 5.1.15• ST_Equals - Returns true if the given geometries represent the same geometry. Directionality is ignored. This method implementsthe SQL/MM specification. SQL-MM 3: 5.1.24• ST_ExteriorRing - Returns a line string representing the exterior ring of the POLYGON geometry. Return NULL if thegeometry is not a polygon. Will not work with MULTIPOLYGON This method implements the SQL/MM specification. SQL-MM 3: 8.2.3, 8.3.3• ST_GMLToSQL - Return a specified ST_Geometry value from GML representation. This is an alias name for ST_GeomFromGMLThis method implements the SQL/MM specification. SQL-MM 3: 5.1.50 (except for curves support).• ST_GeomCollFromText - Makes a collection Geometry from collection WKT with the given SRID. If SRID is not give, itdefaults to -1. This method implements the SQL/MM specification.• ST_GeomFromText - Return a specified ST_Geometry value from Well-Known Text representation (WKT). This methodimplements the SQL/MM specification. SQL-MM 3: 5.1.40• ST_GeomFromWKB - Creates a geometry instance from a Well-Known Binary geometry representation (WKB) and optionalSRID. This method implements the SQL/MM specification. SQL-MM 3: 5.1.41