On Tue, Dec 30, 2008 at 3:41 AM, francesco <francesco.pirotti at unipd.it> wrote:
Dear List, I have been banging my head on a problem for three days now, so I believe the time has come to look for help. I have a polygon shapefile with an irregular grid and I would like to turn the polygons in the shapefile into tiles to use with "quadratcount" method in spatstat package. I have been coercing back and forth with lists, slots, classes and I got a little lost into trying to turn the coordinates of the shapes into tiles. The final objective is to extract statistics on points falling inside each polygons. The points are a SpatialPointsDataframe class with attributes which will be analysed in each polygon as if the polygons were containers.
Hi. This is not a complete solution, but you may find some tips on these two sources: 1. http://casoilresource.lawr.ucdavis.edu/drupal/node/644 2. http://casoilresource.lawr.ucdavis.edu/drupal/node/551 The first one deals with iterating over polygons, the second on conversion between sp and spatstat classes. Cheers, Dylan
I hope I have explained clearly and that someone can point towards a method to use for this. PS I am relatively new to R, but it's fantastic. Cheers, -------------------------------------- Francesco Pirotti Dept. Te.S.A.F./CIRGEO University of Padua Viale dell'Universit? 16 I-35020 Legnaro (PD) tel. +39 049 827 2710 fax. +39 049 827 2686 mob. +39 349 55 39 261 @mail francesco.pirotti at unipd.it skypeID francesco197576 http://www.cirgeo.unipd.it/cirgeo/francescopirotti.htm
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