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...f them may clump together. the problems here are: 1. how to find clumps in a point theme? 2. the convex-hull extension I found only deal with all the points in a theme at each time? how to make each convex hull around each point clump automatically? Thanks. Xiaohua On 5/12/06, Bob Booth <bbooth at esri.com> wrote: > Xiaohua, > > That would be one way to do it. There are others. > Try searching ArcScripts for "convex hull" > http://arcscripts.esri.com/ > > For example: > http://arcscripts.esri.com/details.asp?dbid=14535 > or > http://arcscripts.es...