描述

创建2D、3D Z或4D ZM点几何图形。

使用 ST_MakePointM 使用XYM坐标制作点。

虽然不符合OGC， ST_MakePoint 速度更快，精度更高 ST_GeomFromText 和 ST_PointFromText 。对于数值坐标值，它也更易于使用。

	对于大地坐标， X 是经度和 Y 是纬度

This function supports 3d and will not drop the z-index.

示例

--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

另请参阅

ST_GeomFromText, ST_PointFromText, ST_SetSRID, ST_MakePointM