ST_ZmFlag

ST_ZmFlag
Prev	3. Geometry Accessors	Next

Name

ST_ZmFlag — Returns a code that represents the number of coordinated dimensions of a Geometry.

Synopsis

integer ST_ZmFlag(bytea Geometry);

Alias

ZmFlag

Description

Returns a code that represents the number of coordinated dimensions of a Geometry. Code values are 0=2d, 1=3dm, 2=3dz, 3=4d.


	Jaspa transforms a XYM geometry to a XYZM geometry with Z=0. Therefore, this fuction will never return 1. With a XYM Geometry, Jaspa would return 3, whereas Postgis would return 1.

Coordinate Dimensions

2D	3D	M

Spatial Standards Support

OGC SFS for SQL. 1.1 (1999)	OGC SFS for SQL. 1.1.0 (2005)	OGC SFS for SQL. 1.2.0 (2006))	SQL-MM Part 3
-	-	-	-

Examples

SELECT ST_ZmFlag(ST_GeomFromText('POINT(4 8)'));
--Result
0

SELECT ST_ZmFlag(ST_GeomFromText('LINESTRINGM (0 0 -5, 10 10 -8, 20 10 -10)'));
--Result
3

SELECT ST_ZmFlag(ST_GeomFromText('POINT(4 8 7)'));
--Result
2

SELECT ST_ZmFlag(ST_GeomFromEWKT('POINT(2 5 0 -8)'));
--Result
3

Related functions

ST_CoordDim, ST_CoordDim

Prev	Up	Next
ST_Z	Home	ST_Last