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ST_SimplifyPreserveTopology

Introduction: Simplifies a geometry and ensures that the result is a valid geometry having the same dimension and number of components as the input, and with the components having the same topological relationship.

ST_SimplifyPreserveTopology

Format: ST_SimplifyPreserveTopology (A:geometry, distanceTolerance: Double)

Return type: Geometry

SELECT ST_SimplifyPreserveTopology(polygondf.countyshape, 10.0)
FROM polygondf