PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual77 / 310See AlsoST_GeomFromText7.3.17 ST_LineFromWKBST_LineFromWKB — Makes a LINESTRING from WKB with the given SRIDSynopsisgeometry ST_LineFromWKB(bytea WKB);geometry ST_LineFromWKB(bytea WKB, integer srid);DescriptionThe ST_LineFromWKB function, takes a well-known binary representation of geometry and a Spatial Reference System ID(SRID) and creates an instance of the appropriate geometry type - in this case, a LINESTRING geometry. This function playsthe role of the Geometry Factory in SQL.If an SRID is not specified, it defaults to -1. NULL is returned if the input bytea does not represent a LINESTRING.NoteOGC SPEC 3.2.6.2 - option SRID is from the conformance suite.NoteIf you know all your geometries are LINESTRINGs, its more efficient to just use ST_GeomFromWKB. This functionjust calls ST_GeomFromWKB and adds additional validation that it returns a linestring.This method implements the OpenGIS Simple Features Implementation Specification for SQL 1.1. s3.2.6.2This method implements the SQL/MM specification. SQL-MM 3: 7.2.9ExamplesSELECT ST_LineFromWKB(ST_AsBinary(ST_GeomFromText(’LINESTRING(1 2, 3 4)’))) AS aline,ST_LineFromWKB(ST_AsBinary(ST_GeomFromText(’POINT(1 2)’))) IS NULL AS null_return;aline| null_return------------------------------------------------010200000002000000000000000000F ... | tSee AlsoST_GeomFromWKB, ST_LinestringFromWKB7.3.18 ST_LinestringFromWKBST_LinestringFromWKB — Makes a geometry from WKB with the given SRID.