Hi all. I've just started out using GRASS, so I hope this question isn't too dumb.
I have some raster maps of air pollutant levels in London, by 50m x 50m cell. Firstly, I have a set of postcode points. I have been able to sample pollutant levels at these points using v.what.rast. I have also been able to sample average and maximum levels within small regions surrounding the points (square regions: not ideal, but there we go) using r.neighbours (method=average or method=maximum) to produce a new raster map, followed by v.what.rast. However, I also have vector data on administrative areas (such as electoral wards), which are up to a few square miles in area, and I am trying to discover average and maximum values of the pollutants within these areas. I have studied the documentation I can locate, but have not been able to work out how to achieve this. Any help -- or pointers to where I can find relevant tuturials/docs -- would be very gratefully received. All the best, George -- George MacKerron _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
