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| |
| # ST_MinimumClearance |
| |
| Introduction: The minimum clearance is a metric that quantifies a geometry's tolerance to changes in coordinate precision or vertex positions. It represents the maximum distance by which vertices can be adjusted without introducing invalidity to the geometry's structure. A larger minimum clearance value indicates greater robustness against such perturbations. |
| |
| For a geometry with a minimum clearance of `x`, the following conditions hold: |
| |
| - No two distinct vertices are separated by a distance less than `x`. |
| - No vertex lies within a distance `x` from any line segment it is not an endpoint of. |
| |
| For geometries with no definable minimum clearance, such as single Point geometries or MultiPoint geometries where all points occupy the same location, the function returns `Double.MAX_VALUE`. |
| |
|  |
| |
| Format: `ST_MinimumClearance(geometry: Geometry)` |
| |
| Return type: `Double` |
| |
| Since: `v1.6.1` |
| |
| SQL Example |
| |
| ```sql |
| SELECT ST_MinimumClearance( |
| ST_GeomFromWKT('POLYGON ((65 18, 62 16, 64.5 16, 62 14, 65 14, 65 18))') |
| ) |
| ``` |
| |
| Output: |
| |
| ``` |
| 0.5 |
| ``` |
