PostGIS
Synopsis
+geometry +ST_MakePoint(+`float `+x, float y`)`;
+geometry +ST_MakePoint(+`float `+x, float y, float
z`)`;
+geometry +ST_MakePoint(+`float `+x, float y, float
z, float m`)`;
Description
Creates a 2D, 3D Z or 4D ZM Point geometry.
Use ST_MakePointM to make points with XYM coordinates.
While not OGC-compliant, ST_MakePoint is faster and more precise
than ST_GeomFromText and
ST_PointFromText. It is also easier to use
for numeric coordinate values.
|
This
function supports 3d and will not drop the z-index.
Examples
--Return point with unknown SRID
SELECT ST_MakePoint(-71.1043443253471, 42.3150676015829);
--Return point marked as WGS 84 long lat
SELECT ST_SetSRID(ST_MakePoint(-71.1043443253471, 42.3150676015829),4326);
--Return a 3D point (e.g. has altitude)
SELECT ST_MakePoint(1, 2,1.5);
--Get z of point
SELECT ST_Z(ST_MakePoint(1, 2,1.5));
result
-------
1.5