On Monday 21 July 2008, milton ruser wrote: > Dear all, > > I have a very large BINARY image (60,000x50,000 pixels) and need to > generate the distance map from the 1 values. > When the images are small than my image, I can generate the distance map > using ArcGis (my image is in .IMG format), but ArcGis return error for this > large one. > > I am running R 2.7.1 under windows/xp. Is there a way of do this job using > R ou RSaga? (unfortunately I don�t have GRASS installed), and my > experience with RSAGA is near zero. My computer is 4GB ram. I can load the > images on ArcGis and Erdas without problem, but I only don�t know how do > this task. >
Try and use GRASS. It is made for these types of operations. Since R is memory-bound (for most practical purposes) a sequential-access approach like GRASS should work much better. There is a windows installer for GRASS, or you can just install the latest QGIS: this comes with GRASS! Cheers, Dylan -- Dylan Beaudette Soil Resource Laboratory http://casoilresource.lawr.ucdavis.edu/ University of California at Davis 530.754.7341
_______________________________________________ R-sig-Geo mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-geo
