ST_Simplify

Introduction: This function simplifies the input geometry by applying the Douglas-Peucker algorithm.

Note

The simplification may not preserve topology, potentially producing invalid geometries. Use ST_SimplifyPreserveTopology to retain valid topology after simplification.

Format: ST_Simplify(geom: Geometry, tolerance: Double)

Since: v1.7.0

SQL Example:

SELECT ST_Simplify(ST_Buffer(ST_GeomFromWKT('POINT (0 2)'), 10), 1)

Output:

POLYGON ((10 2, 7.0710678118654755 -5.071067811865475, 0.0000000000000006 -8, -7.071067811865475 -5.0710678118654755, -10 1.9999999999999987, -7.071067811865477 9.071067811865476, -0.0000000000000018 12, 7.071067811865474 9.071067811865477, 10 2))