[R-sig-Geo] generating distance map for Large map

[G. Allegri]

http://grass.itc.it/grass63/binary/mswindows/native/

2008/7/21 Dylan Beaudette <dylan.beaudette at gmail.com>:
> 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
>
>
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