[R] geotiff calculations

[Dylan Beaudette]

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" <laura.poggio at gmail.com>Subject: [R] geotiff
> calculationsTo:
> r-help at r-project.orgMessage-ID:<e027b8750711140022i17f77522vb70a213cbc05760
>b at mail.gmail.com>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]]  
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-- 
Dylan Beaudette
Soil Resource Laboratory
http://casoilresource.lawr.ucdavis.edu/
University of California at Davis
530.754.7341