[gdal-dev] Negative NoData Value with Signed Byte Raster

[Even Rouault]

Le mercredi 06 avril 2016 20:38:36, Jason Greenlaw - NOAA Affiliate a écrit :
> Hello,
> 
> I've run into a snag trying to assign a negative NoData value to a Signed
> Byte raster.

Jason,

I've just pushed a fix for that in trunk (signed byte is a bit of a second 
class citizen as a data type in GDAL, hence the issues) to avoid the erroneous 
clamping. You're supposed to put negative values.
You can workaround the issue by first creating a VRT by adding

    <NoDataValue>-128</NoDataValue>
    <Metadata>
      <MDI key="PIXELTYPE">SIGNEDBYTE</MDI>
    </Metadata>

in <VRTRasterBand>

and then gdal_translate the VRT as TIFF

Even


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