OK, I found a workaround.
with r.mapcalc I identify all values lt 1 and gt 254 and set them to 1
resp. 254. Actually not a nice way but the result is good enough for the
moment.
Anyway, I still would be thankfull for an explanation of the phenomenon,
moreover a better solution to avoid that behaviour.
best regards
Stefan
Am 21.02.2014 00:26, schrieb Stefan Kiefer:
Hi,
I tried to orthorectify aerial photographs. That worked fine by now,
until i got scans wich appear to be darker as before. At least this is
the first observation I made. The effect occured with that scans is,
that after rectification some of the dark areas become white (or
rather null, querying that cells result in -0.722622310236638).
Has anyone had similar experiences when rectifying aerial photographs.
And hopefully a hint how to avoid this damages. I suspect that the
orthorectified images become double precision whereas the imported
scans are integer...
best regards
Stefan
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