I'm writing a paper about this subject and would need to know if there are tools out there that can perform the following task: extract a random subset of polygons from a vector layer whose total area would be equal to a user-defined sampling intensity. Please note I don't need a recipe on how to do this (I've actually created such a tool), I just need to know what others tools are already implemented in commercial or free GIS packages that can do this directly.
I agree with Votsi Nefta, Hawths Tools is an easy to use tool and you can download from http://www.spatialecology.com/htools/tooldesc.php
Thanks Votsi and Rafael. I was aware of Hawths tool. Unfortunately it can only extract a random subset as a % of the number of polygons in the layer, and not as a % of the extent of the layer. That is, with Hawths Tools you cannot specify sampling intensity by area, only by number of polygons. Apologies if I didn't express my question clearly. Any other suggestions out there?
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