CDO

Hi,

I'm trying to select a lonlatbox (cdo sellonlatbox) of a nc file with a non generic grid type (CMIP5's GFDL-CM3 model amip runs).
As to now I have tried:
- cdo setgridtype,cell
- cdo setgrid,grid.txt this worked actually, but the gridtype was still generic

Allways getting the same error
Error (gridToUnstructured) : Grid type >generic< unsupported!

Here is the grid description of the model:

File format: netCDF2
    -1 : Institut Source   Param       Time Typ  Grid Size Num  Levels Num
     1 : unknown  unknown  -1          var  F32     12960   1       1   1
     2 : unknown  unknown  -2          var  F64         1   2       1   1
   Horizontal grids :
     1 : lonlat       > size      : dim = 12960  nlon = 144  nlat = 90
                        lon       : first = 1.25  last = 358.75  inc = 2.5  degrees_east  circular
                        lat       : first = -89  last = 89  inc = 2  degrees_north
                        available : xbounds ybounds
     2 : generic      > size      : dim = 1
   Vertical grids :
     1 : surface                  : 0

Any ideas how to work around this issue with cdo are more than welcome!

Thanks in advance,
Martin