Re: [JPP-Devel] Questions about how OJ handle TIFF

[Giuseppe A. <giu...@ya...>]

Sorry, I forgot the core argument: I was talking about TIFF images loaded
by RasterImageLayer.class ( so called "Open Sextante Raster Image"

Peppe

2015-02-25 11:56 GMT+01:00 Giuseppe Aruta <giu...@ya...>:

> 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
>