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Hi Ahmad, If you need this to be dynamic, the best bet is to use OpenLayers for your client. With a WFS layer configured to pull over the building features from Geoserver, you can let the user pick the buildings and then have a bit of _javascript_ to calculate and display the convex hull. The _javascript_ would get the all polygon vertices as an array of points and then feed them into the getConvexHull() function here: http://en.literateprograms.org/Quickhull_%28Javascript%29 This could then be displayed by Openlayers in fairly quick time. Andy On 30/03/2011 16:37, Ahmad Aburizaiza wrote:
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