ST_MakePoint
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Name

ST_MakePoint — Creates a 2D, 3DZ or 4D Point.

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);

설명

Creates a 2D XY, 3D XYZ or 4D XYZM Point geometry. Use ST_MakePointM to make points with XYM coordinates.

Use ST_SetSRID to specify a SRID for the created point.

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.

[Note]

For geodetic coordinates, X is longitude and Y is latitude
[Note]

The functions ST_Point, ST_PointZ, ST_PointM, and ST_PointZM can be used to create points with a given SRID.

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

예시

-- Create a point with unknown SRID
SELECT ST_MakePoint(-71.1043443253471, 42.3150676015829);

-- Create a point in the WGS 84 geodetic CRS
SELECT ST_SetSRID(ST_MakePoint(-71.1043443253471, 42.3150676015829),4326);

-- Create 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
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