On Apr 15, 2009, at 12:46 AM, <[email protected]> <[email protected]
> wrote:
Renae,
On Wed, Apr 15, 2009 at 7:16 AM, Renae Mackas <[email protected]> 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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