The functions given below are the ones which a user of PostGIS is likely to need. There are other functions which are required support functions to the PostGIS objects which are not of use to a general user. PostGIS has begun a transition from the existing naming convention to an SQL-MM-centric convention. As a result, most of the functions that you know and love have been renamed using the standard spatial type (ST) prefix. Previous functions are still available, though are not listed in this document where updated functions are equivalent. These will be deprecated in a future release. ST_GeometryFromWKB(bytea,[<srid>]) Makes a Geometry from WKB with the given SRID. If SRID is not give, it defaults to -1. OGC SPEC 3.2.7.2 - option SRID is from the conformance suite ST_PointFromWKB(bytea,[<srid>]) Makes a Geometry from WKB with the given SRID. If SRID is not give, it defaults to -1. OGC SPEC 3.2.7.2 - option SRID is from the conformance suite throws an error if WKB is not a POINT ST_LineFromWKB(bytea,[<srid>]) Makes a Geometry from WKB with the given SRID. If SRID is not give, it defaults to -1. OGC SPEC 3.2.7.2 - option SRID is from the conformance suite throws an error if WKB is not a LINESTRING ST_PolyFromWKB(bytea,[<srid>]) Makes a Geometry from WKB with the given SRID. If SRID is not give, it defaults to -1. OGC SPEC 3.2.7.2 - option SRID is from the conformance suite throws an error if WKB is not a POLYGON ST_PolygonFromWKB(bytea,[<srid>]) Makes a Geometry from WKB with the given SRID. If SRID is not give, it defaults to -1. from the conformance suite throws an error if WKB is not a POLYGON ST_MPointFromWKB(bytea,[<srid>]) Makes a Geometry from WKB with the given SRID. If SRID is not give, it defaults to -1. OGC SPEC 3.2.7.2 - option SRID is from the conformance suite throws an error if WKB is not a MULTIPOINT ST_MLineFromWKB(bytea,[<srid>]) Makes a Geometry from WKB with the given SRID. If SRID is not give, it defaults to -1. OGC SPEC 3.2.7.2 - option SRID is from the conformance suite throws an error if WKB is not a MULTILINESTRING ST_MPolyFromWKB(bytea,[<srid>]) Makes a Geometry from WKB with the given SRID. If SRID is not give, it defaults to -1. OGC SPEC 3.2.7.2 - option SRID is from the conformance suite throws an error if WKB is not a MULTIPOLYGON ST_GeomCollFromWKB(bytea,[<srid>]) Makes a Geometry from WKB with the given SRID. If SRID is not give, it defaults to -1. OGC SPEC 3.2.7.2 - option SRID is from the conformance suite throws an error if WKB is not a GEOMETRYCOLLECTION This is a listing of the SQL-MM defined functions that PostGIS currently supports. The implementations of these functions follow the ArcSDE implementation, and thus deviate somewhat from the spec. These deviations will be noted. As of version 1.2.0, these functions have been implemented by wrapping existing PostGIS functions. As a result, full support for curved geometries may not be in place for many functions. SQL-MM defines the default SRID of all geometry constructors as 0. PostGIS uses a default SRID of -1. ST_MLineFromWKB Return a specified ST_MultiLineString value. SQL-MM 3: 9.4.5 ST_MPointFromWKB Return a specified ST_MultiPoint value. SQL-MM 3: 9.2.5 ST_MPolyFromWKB Return a specified ST_MultiPolygon value. SQL-MM 3: 9.6.5 ST_PointFromWKB Return a specified ST_Point value. SQL-MM 3: 6.1.9 ST_PolyFromWKB Return a specified ST_Polygon value. SQL-MM 3: 8.3.7 Additional functions have been added to improve support for an ArcSDE style interface. SE_EnvelopesIntersect Returns t (TRUE) if the envelopes of two geometries intersect; otherwise, it returns f (FALSE). SE_Is3d Test if a geometry value has z coordinate values. SE_IsMeasured Test if a geometry value has m coordinate values. SE_LocateAlong Return a derived geometry collection value with elements that match the specified measur. SE_LocateBetween Return a derived geometry collection value with elements that match the specified range of measures inclusively. SE_M Returns the m coordinate value of an ST_Point value. SE_Z Returns the z coordinate value of an ST_Point value