forgot to send this to the list. Sorry.
see below:
-------- Originalnachricht --------
Betreff: Re: [gdal-dev] gdal_calc.py and NoData issues
Datum: 2014-11-19 14:16
Von: Andreas Neumann <[email protected]>
An: Even Rouault <[email protected]>
Hi Even,
Thank you for trying to help. Unfortunately, the --overwrite option does
not help.
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
--calc="(A==249)*255+(A<>249)*A"
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!
Andreas
Am 2014-11-19 13:58, schrieb Even Rouault:
Le mercredi 19 novembre 2014 13:49:48, Andreas Neumann a écrit :
Hi,
I have an issue with gdal_calc.py and nodata values.
My input data contains a lot of white pixels. After running
gdal_calc.py
with the following parameters
gdal_calc.py -A test.tif --outfile=testcalc.tif
--calc="(A==249)*255+(A<>249)*A"
it turns out that all pixel values with 255 are now nodata values ;-(
Is
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
the
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,
Andreas
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