Hi Carlos,
GDAL would be my first choice - because it easy to automate. However, I
don't know how can do my task with GDAL.
From my grayscale tiff images I want to replace one pixel value (249)
with white (255). All other pixels should stay at the value they have.
I came across https://github.com/chiatt/gdal_reclassify - but this
reclassifies all pixels, not only selected ones.
Maybe I could use http://www.gdal.org/gdal_calc.html with a conditional
syntax?
Thanks,
Andreas
Am 2014-11-19 09:10, schrieb Carlos López PSIG:
Hi Andreas,
I also had problems to reclassify BIGTIFF with SAGA and GRASS!
Finally I used GDAL!
Best regards,
[2]
CARLOS LÓPEZ QUINTANILLA
www.psig.es [2]
carlos.lo...@psig.es
+34 699.680.261
2014-11-19 9:05 GMT+01:00 Andreas Neumann <a.neum...@carto.net>:
Hi,
I tried various tools, e.g.
* SAGA reclassify
* GRASS r.mapcalc
Both work fine on smaller data sets, but fail on big data sets.
This is on Win7 64bit, with the OSGeo4W installer. I have 8gb RAM
and 40GB disk free on C:, more free space on other disks where the
data resides.
I am not totally sure if it is the Bigtiff issue or some other
issue. It is just a guess that maybe I am hitting a limit with tiff.
It is not fully transparent to me what Processing is doing in the
background (what file formats with what options it creates).
It may also be an issue with SAGA or GRASS directly.
Thanks if you know anything,
Andreas
Am 2014-11-18 21:15, schrieb Giovanni Manghi:
Hi,
I am having a lot of troubles with large raster files and
processing.
The intermediate results can go >4GB. Processing stops with not so
helpful error messages.
I wonder if processing is hitting the 4GB limit. Can I force
processing
to use the BIGTIFF option or a raster format that can handle >4GB
files?
Hi Andreas, what tool specifically?
cheers
-- Giovanni --
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