Concave Hull

This node computes the concave hull of geometries represent possibly concave geometries that encloses all geometries within the set. You can think of it as shrink wrapping.


The target_percent is the target percent of area of convex hull the PostGIS solution will try to approach before giving up or exiting. One can think of the concave hull as the geometry you get by vacuum sealing a set of geometries. The target_percent of 1 will give you the same answer as the convex hull. A target_percent between 0 and 0.99 will give you something that should have a smaller area than the convex hull. This is different from a convex hull which is more like wrapping a rubber band around the set of geometries.

Input Ports

Table containing a single geometry list in GeoJSON format with other attributes. The geometry column name should be prefixed with name "the_geom"".

Output Ports

Table containing geometries after computing concave hull.

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