On Wednesday 14 November 2007, Monica Pisica wrote: > Laura, > > As far as i know RGDAL and maybe proj4 will help you with geotiff, but it > may be tricky if you want to preserve the geotiff projection. Your safest > bet is to use a GIS software and ESRI ArcGIS can do everything you want > without using R. To calculate differences, mean, and so on is a simple task > in ArcGIS, no need for R. Evem more advanced statistics can be done in > ArcGIS in their "expanded" calculator. You also can do some geostatistics, > analysis of variances, correlations, "hot spots" and local outliers. > > I hope this helps, > > Monica
Or, if you like open source software, GRASS will do all of the above, has a great connector to R, and is free! cheers, Dylan > > ------------------------------ Message: 110Date: Wed, 14 Nov 2007 09:22:52 > +0100From: "Laura Poggio" <[EMAIL PROTECTED]>Subject: [R] geotiff > calculationsTo: > [EMAIL PROTECTED]:<e027b8750711140022i17f77522vb70a213cbc05760 >[EMAIL PROTECTED]>Content-Type: text/plain Dear list,I have to compare two > digital elevation models in raster format (geotiff).I then have to > calculate the differences in altitude for each cell and makesome statistics > (basic as mean, median, std, range but also more "advanced"as RMSE) on > that.I do not know very much how to proceed:1) is it possible to import the > geotiff in R? If so with which package? ifnot which is the best way to > import such files?2) is it better to perform the calculations of the > differences in a GISsoftware and then to use R only for statistical > analysis? or it is better todo everything in R?3) is there any specific > package for doing this kind of analysis? Thank you very much in advance > Laura [[alternative HTML version del! eted]] > ------------------------------ > _________________________________________________________________ > [[replacing trailing spam]] > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html and provide commented, minimal, > self-contained, reproducible code. -- Dylan Beaudette Soil Resource Laboratory http://casoilresource.lawr.ucdavis.edu/ University of California at Davis 530.754.7341 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
