#6175 closed defect (fixed)

netCDF classic reports negative nodata value for unsigned byte > 127

Reported by: Even Rouault Owned by: Even Rouault
Priority: normal Milestone: 2.1.0
Component: GDAL_Raster Version: unspecified
Severity: normal Keywords: netcdf
Cc:

Description

When creating a netCDF dataset (with classic netCDF) with GDAL Byte type (ie unsigned) and setting a nodata value in [128,255] range, and reading it back, it appears negative. This is due to classic netCDF only supporting signed byte by default. GDAL uses a trick (metadata _Unsigned=True) to correct the interpretation, so in case of unsigned byte, we have to offset negative nodata values by 256 to get back the correct value

Change History (2)

comment:1 Changed 21 months ago by Even Rouault

trunk r31158 "netCDF: read correctly nodata values in [128,255] range for (unsigned) Byte data type (#6175)"

comment:2 Changed 21 months ago by Even Rouault

Component: defaultGDAL_Raster
Milestone: 2.1.0
Resolution: fixed
Status: newclosed
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