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

[Mark Seibel]

Would you please post your command syntax, and associated error?

Mark

"Andrew Lewin" <andrew.lewin at sympatico.ca> wrote:

>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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>>>> 
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>> 
>> 
>

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