[GRASS-user] r.patch not working

[Renae Mackas]

Michael Barton wrote:
> 
> 
> 
> On Apr 15, 2009, at 12:46 AM, <grass-user-request at lists.osgeo.org>
> <grass-user-request at lists.osgeo.org 
>  > wrote:
> 
>> Renae,
>>
>> On Wed, Apr 15, 2009 at 7:16 AM, Renae Mackas <rmackas at sfu.ca> wrote:
>>>
>>> Hello GRASS users-
>>>
>>> I am trying to mosaic colourcomposites from LANDSAT images.  A few  
>>> weeks ago, I had luck doing this using r.patch with the -z flag  
>>> such as below:
>>>
>>> r.patch -z input=020.020.2000.055_rgb,021.020.2000.014_rgb, 
>>> 021.021.2000.142_rgb,022.020.2000.005_rgb output=mosaic
>>>
>>> When I try doing this now however, r.patch does not seem to be  
>>> working.  In the output window, it shows a red cirle with an "X" in  
>>> it next to the command, but does not print any error message  
>>> below.  I have tried patching even just the original rasters  
>>> (rather than the rgb composites), and continue to get the same  
>>> results.
>>>
>>> Since the initial (successful) attempts with r.patch, I have  
>>> extended the boundaries of the region I am working with and  
>>> imported rasters from other locations.  All of the image rasters  
>>> are currently within the region boundaries though.  Is there any  
>>> reason why the changes I have made would have changed how r.patch  
>>> functions?  Any suggestions of how to get it working again?
>>
>> r.patch (like almost all rast commands) respect the current region.
>> You need to first set the  current region to all raster maps of  
>> interest,
>> then run r.patch:
>>
>> g.region rast=020.020.2000.055_rgb,021.020.2000.014_rgb, 
>> 021.021.2000.142_rgb,022.020.2000.005_rgb
>> -p
>>
>> r.patch ...
>>
>> Hope this helps
>> Markus
> 
> You don't say which GRASS version you are running and which platform  
> you are using. Recently, we've run into the problem that random  
> modules like r.patch do not work or work intermittently in Windows  
> Vista using the OSGEO4W installer of GRASS 6.4RC3. A new binary  
> installer for GRASS 6.4RC4 hopefully solves this problem.
> 
> Michael
> 
> 
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> grass-user at lists.osgeo.org
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> 
> 

Hi Michael-

I was using GRASS 6.3.0 on windows vista.  Being that the current region was
set to the rasters and I still was having problems, I suspect that I may
have just been having temproary problems with r.patch.  I will try updating
my version of GRASS and see if that helps.

Thanks,

Renae
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