Hi,
I use OJ/Sextante for spatial analysis on DEM. And recently I wanted to
extend OJ raster capabilities to make it more flexible.
In some occasion I checked that OJ doesn't handle NonData value very well,
for instance a)on displaying on workbench or b) on querying raster info,
ex.using the new tool Raster>Raster statistics {Which I made :-( } .
In several times OJ reads NoData value as the minimun value - it is the
experience of the user to understand and try to solve it.
Grid files have not such problem (FLT or ASC, handled by OJ) as NoDat is
written into the headers.
How does OJ handle nodata values?
Does OJ recognize only the standard ESRI -9999 value or even any other
arbitrary nodata values (SAGA -999999? In may occasion I found elevation
DEM where the nodata value was set to 0, you can understand when this DEM
are used for slope or aspect maps!)?
Can we handle nodata on TIFs, maybe using the auxiliary XML file (thanks
Alberto's job)?
Thanks in advance for the answer. It would be fine for me if I have a help.
Giuseppe Aruta
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