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mass importing rasters

6 messages · Robert J. Hijmans, Nikhil Kaza, Thomas Adams +1 more

Original
Martin
# 
a simple question:
how can I automatically import a huge bunch of rasters (Geotiffs) to R?
With a for loop? I didn't find how to do that in the docs..
Each variable name should be the original raster name, but that's not
important.

greets,
Martin
Nikhil Kaza
# 
haven't tried this. but some variant of this should work

for (f in dir()){
assign(f, readGDAL(f))
}



Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina

nikhil.list at gmail.com
On Sep 12, 2010, at 4:29 PM, Martin Brandt wrote:

            

      
      
      
    

        

      
      
    

  
  


  


      

    

    

      
      

        


  

        

      Robert J. Hijmans
    

    

      
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You have not said what type of objects you want, but here's one option:

library(raster)
s <- stack(list.files(pattern='*.tif'))

Robert

        
On Sun, Sep 12, 2010 at 10:29 PM, Martin Brandt <martin_brandt at gmx.net> wrote:

            

      
      
      
    

        

      
      
    

  
  


  


      

    

    

      
      

        


  

        

      Nikhil Kaza
    

    

      
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This is neat!

        
On Sep 12, 2010, at 5:18 PM, Robert J. Hijmans wrote:

        

            

      
      
      
    

        

      
      
    

            

      
      
      
    

        

      
      
    

  
  


  


      

    

    

      
      

        


  

        

      Thomas Adams
    

    

      
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Martin,

Depending on what you are doing, you may want to consider the use of 
GRASS GIS (http://grass.osgeo.org/) in combination with R. This has been 
a successful strategy for me in the past, not using Geotiffs, however. 
The advantage is that the Geotiffs can be imported into GRASS GIS format 
in batch form and then using r.mapcalc within GRASS, nearly any map 
algebra calculations are possible without running into memory issues 
that you may encounter with R alone.

Regards,
Tom

        
On 9/12/10 4:29 PM, Martin Brandt wrote:

            

      
      
      
    

        

      
      
    

        

  
    

      
      
    

  


  


      

    

    

      
      

        


  

        

      Martin
    

    

      
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This is a great solution, thanks everyone!



-----Urspr?ngliche Nachricht-----
Von: Robert J. Hijmans [mailto:r.hijmans at gmail.com] 
Gesendet: Sonntag, 12. September 2010 23:18
An: Martin Brandt
Cc: r-sig-geo at stat.math.ethz.ch
Betreff: Re: [R-sig-Geo] mass importing rasters

You have not said what type of objects you want, but here's one option:

library(raster)
s <- stack(list.files(pattern='*.tif'))

Robert

On Sun, Sep 12, 2010 at 10:29 PM, Martin Brandt <martin_brandt at gmx.net>
wrote: