[gdal-dev] Fwd: Re: gdal_calc.py and NoData issues
a.neumann at carto.net
Wed Nov 19 05:16:56 PST 2014
forgot to send this to the list. Sorry.
-------- Originalnachricht --------
Betreff: Re: [gdal-dev] gdal_calc.py and NoData issues
Datum: 2014-11-19 14:16
Von: Andreas Neumann <a.neumann at carto.net>
An: Even Rouault <even.rouault at spatialys.com>
Thank you for trying to help. Unfortunately, the --overwrite option does
I have a very small test file at http://webgis.uster.ch/temp/test.tif
I used the following options:
gdal_calc.py -A test.tif --overwrite --outfile=testcalc.tif
All pixels with values of "255" are now "nodata" after running gdal_calc
May I please ask you to test/verify this?
Thanks a lot!
Am 2014-11-19 13:58, schrieb Even Rouault:
> Le mercredi 19 novembre 2014 13:49:48, Andreas Neumann a écrit :
>> I have an issue with gdal_calc.py and nodata values.
>> My input data contains a lot of white pixels. After running
>> with the following parameters
>> gdal_calc.py -A test.tif --outfile=testcalc.tif
>> it turns out that all pixel values with 255 are now nodata values ;-(
>> there an option so that my 255 values are not turned into nodata? I
>> tested with the --NoDataValue option (e.g. 99 - which I don't use in
>> image), but it seems to be ignored. For me it is important that black
>> and white pixels are preserved.
> Use --overwrite as well, since otherwise the existing output file will
> be used
> to be just updated and not recreated.
> It would be appropriate that the utility warns that --NoDataValue has
> no effect
> when the output file exists.
>> Thanks for any hints,
>> gdal-dev mailing list
>> gdal-dev at lists.osgeo.org
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