[GRASS-user] Clip/Extract Rasters using a vector

[Andrew Lewin]

Hi John and Mark,

I am getting a syntax error when I type in either of your statements.  To be clear, I am using Mac Snow Leopard in the Terminal program (bash).  

Cheers,

Andrew

Andrew Lewin
andrew.lewin at sympatico.ca

President 
Coastal/Marine Spatial Ecologist
Spatial-Conserve Incorporated

Associate 
C-FOAM (Canadian Fisheries, Oceans and Aquaculture Management Group)
Telfer School of Management, University of Ottawa







On 2010-09-16, at 12:22 PM, John C. Tull wrote:

> Correct me if I am wrong, but for step 3, you can simply use an equality statement, i.e., echo clippedRaster=NA_temperature | r.mapcalc'. This shortens things a little further.
> 
> Regards,
> John
> 
> On Sep 16, 2010, at 8:41 AM, Mark Seibel wrote:
> 
>> Surely there is a more elegant way...
>> 
>> 1) Convert the vector you wish to use as a clipper to a raster.
>> 2) Set the raster mask to be the raster clipper (the converted vector).
>> 3) Use map calculator to perform some non-data altering operation, but
>> get the mask to do its thing (eg. echo 'clippedRaster=NA_temperature +
>> 0 | r.mapcalc').
>> 
>> Mark
>> 
>> On Thu, Sep 16, 2010 at 10:52 AM, Andrew Lewin
>> <andrew.lewin at sympatico.ca> wrote:
>>> Dear Listers,
>>> I would like to clip or extract a raster using a vector file; however, I
>>> can't seem to find the command to do this in GRASS 6.4 ORC6.  The raster
>>> file is an interpolated file of temperature for North America.  The raster
>>> file extends beyond the North America boundaries. I would like to clip the
>>> raster file to the North American boundaries, but I cannot find the command
>>> to do so.
>>> I would appreciate any help possible.
>>> Thank You,
>>> Andrew
>>> Andrew Lewin
>>> andrew.lewin at sympatico.ca
>>> 
>>> President
>>> Coastal/Marine Spatial Ecologist
>>> Spatial-Conserve Incorporated
>>> Associate
>>> C-FOAM (Canadian Fisheries, Oceans and Aquaculture Management Group)
>>> Telfer School of Management, University of Ottawa
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
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>>> grass-user mailing list
>>> grass-user at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/grass-user
>>> 
>>> 
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> 

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