ST_XMin

Returns the minimum x-coordinate of the minimum bounding rectangle of the GEOMETRY or GEOGRAPHY object.

For GEOGRAPHY types, Vertica Place computes minimum coordinates by calculating the minimum longitude of the great circle arc from (MIN(longitude), ST_YMin(GEOGRAPHY)) to (MIN(longitude), ST_YMax(GEOGRAPHY)). In this case, MIN(latitude) represents the minimum longitude value of the geography object

If either latitude or longitude is out of range, ST_XMin returns the minimum plain value of the geography object.

Behavior type

Syntax

ST_XMin( g )

Arguments

g

Spatial object for which you want to find the minimum x-coordinate, type GEOMETRY or GEOGRAPHY.

Returns

FLOAT

Supported data types

Examples

The following examples show how to use ST_XMin.

Returns the minimum x-coordinate within a rectangle:

=> SELECT ST_XMin(ST_GeomFromText('POLYGON((0 1,0 2,1 2,1 1,0 1))'));
  ST_XMin
----------
       0
(1 row)

Returns the minimum longitude value within a rectangle:

=> SELECT ST_XMin(ST_GeographyFromText(
    'POLYGON((-71.50 42.35, -71.00 42.35, -71.00 42.38, -71.50 42.38, -71.50 42.35))'));
  ST_XMin
----------
    -71.5
(1 row)