Problems remapping GRIB rotated_latlon vector fields with CDO
Added by Carlos Santos almost 11 years ago
Hi all,
I get some problems when remapping GRIB rotated latlon vector fields:
(1) sellonlatbox
cdo sellonlatbox,-45,-16,-9,9 $fileIn $fileOut
It crops properly the field, but CDO changes one GRIB header property:
uvRelativeToGrid=1 in the original file, but uvRelativeToGrid=0 in the cropped one; therefore, the field is not properly displayed, though the values are correct.
This can be easily fixed using grib_api:
grib_set -s uvRelativeToGrid=1 $fileOut $fileOutCorrected
(2) remapbil
cdo remapbil,mygrid $fileIn $fileOut
Here CDO is not remapping properly: the output vector field seems to be referred to a regular latlon grid, not taking into account the rotation of the original grid.
(1) is just a bug that might be easily fixed inside CDO code
(2) seems to be more difficult to address
I provide a tar.gz'ed directory with a small sample.
Any help or comment?
Thanks in advance
Carlos