Re: read ECHAM5 (Gaussian Latitude/Longitude Grid)

Hi Mehmet,

You can easily remap the ECHAM5 Gaussian grid to a fixed
grid with the Climate Data Operators (CDO), freely
available at:
http://www.mpimet.mpg.de/fileadmin/software/cdo/

Example: Using CDO to remap data from Gaussian grid to a
fixed grid (say, 2.5 by 2.5 => r144x73).

First you can convert the grib files to netCDF as:

cdo -f nc copy ECHAM5_in.grb ECHAM5_in.nc

For the remapping use:

cdo gencon,r144x73, ECHAM5_in.nc weights.nc
cdo remap,r144x73,weights.nc ECHAM5_in.nc ECHAM5_out.nc

The data in ECHAM5_out.nc will be in a 2.5 by 2.5 fixed
grid.

Good luck

Carlos

Em Wed, 31 Mar 2010 17:07:34 +0200
  Mehmet Coskun <mehmet.coskun@ufz.de> escreveu:
> Hi,
> I tried to read ECHAM5 grib file which is Gaussian
>Latitude/Longitude Grid , I got a warning message;
>
> !! warning:GdsGAGrid: Gaussian latitude coordinate array
>is partially or wholly undefined
>
>
> Also my lattitute are not geographic latitute, How can I
>convert Gaussian Latitude/Longitude Grid to regular
>grid?
>
> 1.440558e+32
> 8.547921e-44
> 2.224632e-37
> 0
> 2.224708e-37
> 0
> 0
> 0
> 0
> 0
> 0
> 0
> 2.224697e-37
> 0
> 0
> 0
> 0
> 0
> 6.866362e-44
> 0
> 1.853472e-37
> 0
> 2.22465e-37
> 0
>
> thanks
>
> Best regard
>
> mehmet

_________________________________
Physics Department
University of Aveiro.
Campus Universitário de Santiago
3810-193 Aveiro.
Portugal
_________________________________
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Received on Wed Mar 31 09:45:23 2010