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

[Micha Silver]

On 09/20/2010 07:23 PM, stephen sefick wrote:
> quote the string before the pipe?
>    
Or more simply:
r.mapcalc natemp20092010=mynatempnewrast
> On Mon, Sep 20, 2010 at 12:03 PM, Andrew Lewin
> <andrew.lewin at sympatico.ca>  wrote:
>    
>> Here is the error:
>> GRASS 6.4.0RC6 (MacrophytesGIS):~/grass/MacrophytesGIS/PERMANENT>
>> natemp20092010=mynatempnewrast + 0 | r.mapcalc
>> bash: +: command not found
>> syntax error, unexpected $end, expecting NAME or STRING
>> Parse error
>> 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 2010-09-20, at 12:59 PM, Mark Seibel wrote:
>>
>> 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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>> --
>> Sent from my Android phone with K-9 Mail. Please excuse my brevity.
>>
>>
>>
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>>      
>
>
>    


-- 
Micha Silver
Arava Development Co. +972-52-3665918
http://www.surfaces.co.il