R help - Jan 2011 - Select unique point occurences per pixel - raster package (?) question

Dear all,


This may be a simple question, but I cannot find the solution. I have a 
point shapefile containing several hundreds of points, and a grid file 
with a certain pixels size. Certain grid cells have several points 
falling into them. I am looking for a way to randomly select one point 
per grid cell, resulting in a new point shapefile whereby there maximum 
one point per pixel remains. In other words, for the grid layer under 
consideration, I want to select 'unique point occurrences'.

Any suggestions?


Many thanks,


Diederik


-- 
Dr.Diederik Strubbe
Evolutionary Ecology Group
Department of Biology
University of Antwerp
Middelheimcampus GV310
Groenenborgerlaan 171
2020 Antwerpen, Belgium
office: +32 3 265 3282
mobile phone: +32 477445568
skype user name: lakrinn


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