Hermann,
It appears they are distinct items. The INIT_DEST essentially sets
the output file completely to the indicated value when it is created
while the dstnodata switch determines whether the warper considers an
existing pixel to be set in the output file yet or not when attempting
to do alpha blending and such.
Aha. Then the gdalwarp man page might be misleading. It says:
-dstnodata value [value...]:
(...) New files will be initialized to this value and ...
On the other hand:
I am currently warping quite a lot of DEM files with '-srcnodata -9999
-dstnodata -9999' and the result is what I expected: both nodata values that
existed in the source file and the additional ones generated through warping
appear as -9999 in the destination file.
Hermann
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