[gdal-dev] Removing Nodata pixels from raster

[Etienne Tourigny]

you can surely identify the valid pixels with visualization software
such as qgis, using the valuetool plugin, to identify the 4 corners of
the valid region.

Another option is to compress the gtiff with e.g. DEFLATE compression like this

gdal_translate -co COMPRESS=DEFLATE in.tif out.tif

Etienne

On Thu, Oct 25, 2012 at 1:32 PM, katrin eggert
<katrineggert1980 at gmail.com> 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
>>
>>
>
>
> _______________________________________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/gdal-dev