PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual78 / 310Synopsisgeometry ST_LinestringFromWKB(bytea WKB);geometry ST_LinestringFromWKB(bytea WKB, integer srid);DescriptionThe ST_LinestringFromWKB function, takes a well-known binary representation of geometry and a Spatial Reference SystemID (SRID) and creates an instance of the appropriate geometry type - in this case, a LINESTRING geometry. This functionplays the 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 geometry.This an alias for ST_LineFromWKB.NoteOGC SPEC 3.2.6.2 - optional SRID is from the conformance suite.NoteIf you know all your geometries are LINESTRINGs, it’s 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: 7.2.9ExamplesSELECTST_LineStringFromWKB(ST_AsBinary(ST_GeomFromText(’LINESTRING(1 2, 3 4)’))) AS aline,ST_LinestringFromWKB(ST_AsBinary(ST_GeomFromText(’POINT(1 2)’))) IS NULL AS null_return;aline| null_return------------------------------------------------010200000002000000000000000000F ... | tSee AlsoST_GeomFromWKB, ST_LineFromWKB7.3.19 ST_MakeBox2DST_MakeBox2D — Creates a BOX2D defined by the given point geometries.Synopsisbox2d ST_MakeBox2D(geometry pointLowLeft, geometry pointUpRight);