PostGIS

ST_X

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7.4. Geometry Accessors

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Name

ST_X — Returns the X coordinate of a Point.

Synopsis

float +`*`+ST_X*(`geometry `a_point`)`;

Description

Return the X coordinate of the point, or NULL if not available. Input must be a point.

Note

To get the minimum and maximum X value of geometry coordinates use the functions ST_XMin and ST_XMax.

check This method implements the SQL/MM specification.

SQL-MM 3: 6.1.3

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

Examples

SELECT ST_X(ST_GeomFromEWKT('POINT(1 2 3 4)'));
 st_x
------
    1
(1 row)

SELECT ST_Y(ST_Centroid(ST_GeomFromEWKT('LINESTRING(1 2 3 4, 1 1 1 1)')));
 st_y
------
  1.5
(1 row)

See Also

ST_Centroid, ST_GeomFromEWKT, ST_M, ST_XMax, ST_XMin, ST_Y, ST_Z

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