CDO

Hi

I treat an .nc file using a custom routine written in F90. Afterwards I want to substract two fields. The treated field (in file modfield.nc) using the F90 routine and the "original" field I use as an input to the F90 routine. To do this I use the sub operators.

cdo sub modfield.nc originalfield.nc

I get the follwoing warning:

cdo(3) sub (Warning): Grids have different types! First grid: generic; second grid: lonlat

I think is beacsue I didnt specify a grid in the modfield.nc and therefor it is set to generic by default. Becasue I know that the two grids are the same it is safe to set the grid in modfield.nc to lonlat:

cdo setgridtype,lonlat modfield.nc out.nc

I get the following error message:

cdo setgridtype (Abort): Unsupported grid name: lonlat

Am I missing something?

Thank you for your help.

Output from griddes origfile.nc:

1. gridID 0 #
   gridtype = lonlat
   gridsize = 16380
   xname = lon
   xlongname = longitude
   xunits = degrees_east
   yname = lat
   ylongname = latitude
   yunits = degrees
   xsize = 180
   ysize = 91
   xfirst = 0
   xinc = 2
   yfirst = -90
   yinc = 2

Output from griddes mdofile.nc:

1. gridID 0 #
   gridtype = generic
   gridsize = 16380
   xname = lon
   xunits = degrees_east
   yname = lat
   yunits = degrees
   xsize = 180
   ysize = 91
   xfirst = 0
   xinc = 2
   yfirst = -90
   yinc = 2

PS: Thx a lot for this amazing product.