[gdal-dev] gdal_merge unexpectedly setting nodata to zeros

[thibautvoirand]

Hi all,

I am trying to merge 4 rasters containing nodata pixels using gdal_merge in
a single file with separate bands.
I use -9999 as nodata value.

In the output file, the first band has the correct nodata pixels (-9999) but
the following 3 bands have some zeros, in pixels that were nodata in the
input file.

My command line:
gdal_merge.py -o out.tif -separate -n -9999 -a_nodata -9999 -ot Float32
b1.tif b2.tif b3.tif b4.tif

My issue seems to resemble this issue:
https://gis.stackexchange.com/questions/190715/gdal-merge-stacking-files-nodata-value-wrong

Is this a bug or am I doing something wrong?

Thanks,
Thibaut



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