[gdal-dev] GRIB2 to NetCDF - Large areas of data missing

[Etienne Tourigny]

You probably are experiencing a known bug, when the warping operation needs
more memory than the warp cache.

Try setting adding the following to the gdalwarp command (if it doesn't
work try a larger value).

--config GDAL_CACHEMAX 1000 -wm 1000

Also please update the ticket with any new information

http://trac.osgeo.org/gdal/ticket/4484

cheers
Etienne

On Wed, Jul 17, 2013 at 5:31 PM, Jason Greenlaw - NOAA Affiliate <
jason.greenlaw at noaa.gov> wrote:

> I am experiencing strange behavior when reprojecting/converting a GRIB2
> file to NetCDF using gdalwarp, where the resulting NetCDF file is missing
> lots of data (or possibly being set incorrectly to NoData) west of a
> certain longitude.  However, if I instead reproject from GRIB2 to an
> intermediate format (e.g. GeoTIFF), then convert to NetCDF using
> gdal_translate, the result is correct.
>
> The source projection is the weather service's custom lambert conformal,
> and the destination is WGS84.  I'm using the following command:
>
>     gdalwarp -wm 256 -of netcdf -srcnodata 9999.0 -dstnodata 9999.0 -t_srs
> EPSG:4326 conus-wspd-01.bin conus-wspd-01.nc
>
> GDAL versions tested were 1.9.2 and 1.10.
>
> Screenshot of original GRIB2 file (first GRIB message) as displayed in
> ArcMap: http://jetstreak.unh.edu/gdal/full.png
> Screenshot of resulting NetCDF file (variable Band1) as displayed in
> ncBrowse: http://jetstreak.unh.edu/gdal/cropped.png
>
> Original GRIB2 file (6.3mb):
> http://jetstreak.unh.edu/gdal/conus-wspd-01.bin
> Resulting NetCDF file (171mb):
> http://jetstreak.unh.edu/gdal/conus-wspd-01.nc
>
> Anyone run into a similar problem or have any ideas for how to resolve
> this?
>
> Thanks,
> Jason
>
>
>
>
>
>
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