[GRASS-user] r.composite changing pixel resolution?

[Tim Holland]

Dear Jose Maria -

Thanks very much!  That did it.

Best,
Tim

On Fri, Feb 13, 2009 at 3:54 PM, José María Michia
<jose.maria.michia at gmail.com> wrote:
> Ops! Sorry, I used the translator incorrectly!
>
> Corrections:
>
>> To check the values of the active region, use the following command:
>>
>> g.region -p
>>
>> To set the values of the active region to the same values as their
>> input maps, use:
>>
>> g.region -p rast=name_of_raster_map
>>
>> To check the values of some map, use:
>>
>> r.info map=name_of_raster_map
>
> And an important note: I'm not sure if this information is applicable
> using the plugin in QGIS.
>
> Please, sorry again, I make many mistake but with the best intentions!
>
> Saludos
>
> 2009/2/13 José María Michia <jose.maria.michia at gmail.com>:
>> Hi Tim and all!
>>
>> 2009/2/13 Tim Holland <timothyholland at gmail.com>:
>>>
>>> Dear all,
>>>
>>> I am new to both Grass and this forum, so apologies in advance for something
>>> which is likely a simple mistake or oversight on my part (but I have
>>> searched the forum and can't seem to find an answer).
>>>
>>> I am trying to create RGB-composite images from various sets of Landsat
>>> bands (3,2,1 or 4,5,3).  When I try to do this using r.composite, the
>>> resulting raster file has a far courser pixel resolution than the original
>>> images (it looks like it is scaling up by a factor of 12 - so 30m x 30m
>>> pixels become 360m x 360m).  I can't see anything in the r.composite manual
>>> that suggests why this would be happening.
>>>
>>> If it is relevant, I am also using i.landsat.rgb to balance the colours
>>> before I am using the r.composite.  Also, I am using Grass 6.3, and running
>>> it through the plugin on QGIS 0.11.0.
>>
>>
>> When you run a command that produces a new map, usually the new map
>> has the size and resolution of the active region, not far and the
>> resolution of input maps.
>>
>> To check the values of the active region, use the following command:
>>
>> g.region-p
>>
>> To set the values of the active region to the same values as their
>> input maps, use:
>>
>> RAST g.region P = name_of_raster_map
>>
>> To check the values of some map, use:
>>
>> r.info map name_of_raster_map =
>>
>> I hope this helps!
>>
>> Saludos
>> José María
>>
>