Is there any open-source library to aggregate detached polygons? I know that there is a tool in ArcInfo, but it is commercial.
Answer
PostGIS has a ST_ConcaveHull function which equates closely to the Aggregate Polygons function of ArcGIS. Sadly Spatialite does NOT have this function.
A concave hull can be thought of as a "shrink-wrapped" convex hull.
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