PostGIS

ST_GeneratePoints
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ST_GeneratePoints

8.14. Geometry Processing

Name

ST_GeneratePoints — Generates random points contained in a Polygon or MultiPolygon.

Synopsis

geometry +`*`+ST_GeneratePoints*( g geometry , npoints integer );

geometry +`*`+ST_GeneratePoints*( geometry g , integer npoints , integer seed );

Description

ST_GeneratePoints generates a given number of pseudo-random points which lie within the input area. The optional seed is used to regenerate a deterministic sequence of points, and must be greater than zero.

Availability: 2.3.0

Enhanced: 3.0.0, added seed parameter

Examples

st_generatepoints01

Generated 12 Points overlaid on top of original polygon using a random seed value 1996

SELECT ST_GeneratePoints(geom, 12, 1996)
FROM (
    SELECT ST_Buffer(
        ST_GeomFromText(
        'LINESTRING(50 50,150 150,150 50)'),
        10, 'endcap=round join=round') AS geom
) AS s;

ST_FilterByM

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ST_GeometricMedian