About knowing new modules: I didn't know about r.clump<br><br>a way to accomplish the subject task: r.to.vect for areas where certain locations fall.<br>It can be done with the following flow: <br><br>r.clump -> loop over r.what (at locations places) and then r.reclass or r.mapcalc to MASK areas other then the ones around singol locations -> r.to.vect<br>
<br>Giovanni<br><br><br>