Volker Wichmann | 26 Oct 17:33 2012
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Re: Removing Nodata pixels from raster

In SAGA GIS there is a "Crop to Data" module (in Grid Tools module 
library), which performs the task.

But this would require you to import your Geotif with the GDAL import 
module, process it in SAGA, and finally export it as Geotif again with 
the GDAL export module.

Best regards,
Volker

On 10/25/2012 05:32 PM, katrin eggert wrote:
> Hello
> No I don't know where my valid pixels are.
> Any alternative?
>
> 2012/10/25 Kyle Shannon <kyle <at> pobox.com>
>
>> Katrin,
>> Do you know where you valid pixels are in the image?  If so,
>> gdal_translate with -srcwin would work:
>>
>> kyle <at> ubuntu:~$ gdal_translate -srcwin xoff yoff 60 100 in.tif out.tif
>>
>> where xoff, yoff are the number of pixels from the image origin that your
>> valid region begins(pixels, lines).  See
>> http://gdal.org/gdal_translate.html for more info.
>>
>>
>>
>> On Thu, Oct 25, 2012 at 8:05 AM, katrin eggert <katrineggert1980 <at> gmail.com
>>> wrote:
>>
>>> Greetings
>>> I have a Geotif with only one Layer with a size of 6000x5000 but from
>>> which I only have a square of 60x100 with bvalid pixels. the remaining are
>>> NOdata. The problem is that this Geotiff is a big file 90MB and without
>>> these NoData values I would have a much smaller raster.
>>> How can I generate a new Geotiff without these noValid values and with
>>> extent adjusted to the valid pixels?
>>> Thank you
>>> Regards,
>>> Katrin E.
>>>
>>> _______________________________________________
>>> gdal-dev mailing list
>>> gdal-dev <at> lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>>>
>>
>>
>
>
>
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Gmane