Hi Simen,
<> means not - same as !=
Andreas
Am 2014-11-19 15:09, schrieb Simen Langseth:
I saw the symbol <> first time in gdal calc what is meaning of it?
Thanks
On Wed, Nov 19, 2014 at 10:21 PM, Even Rouault
<[email protected]> wrote:
Le mercredi 19 novembre 2014 14:16:05, Andreas Neumann a écrit :
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 [1]
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
;-(
I wrote "as well", so try with "--overwrite --nodata 99".
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
>> _______________________________________________
>> gdal-dev mailing list
>> [email protected]
>> http://lists.osgeo.org/mailman/listinfo/gdal-dev [2]
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