[gradsusr] GrADS problem

[jessica falzon]

Thanks a lot. Sorry I forgot, the version of GrADS is opengrads. Ok then, I
will try the re() function.

On Tue, Nov 8, 2011 at 2:01 PM, Arlindo da Silva <dasilva at alum.mit.edu>wrote:

> Jessica,
>
> GrADS does not perform automatic regridding. If the 2 files have different
> lat/lon grids you won't be able to subtract them unless you regrid one of
> the variables. You forgot to tell us the version of GrADS you are running,
> so I am sure if you are using opengrads or not. If using opengrads you
> should use the re() <http://opengrads.org/doc/udxt/re/> function with box
> averaging to remap the higher resolution variable to the grid of the lower
> resolution.
>
> The COLA releases come with a linear interpolation function lterp()
> <http://grads.iges.org/grads/gadoc/gradfunclterp.html>that performs
> bilinear interpolation. Given that your variable is soil temperature, I'd
> not recommend linear interpolation in this case, but for a quick plot it
> should be OK.
>
>    Arlindo
>
>
> On Mon, Nov 7, 2011 at 12:57 PM, jessica falzon <
> jessica.falzon91 at gmail.com> wrote:
>
>> Hello. I am Jessica and I really appreciate if you help me solve this
>> problem.
>>
>> I am running GrADS on LINUX
>>
>> I am trying to do a bias of a measured file (08225.30yr.mean.stat.pp.nc)
>> and a referenced file (8225_ESRL_1960-1990.nc). The problem is that
>> although I am defining the latitude and longitude, an error occurs stating
>> that the grids do not match.
>>
>> The red part is the error output of GrADS.
>>
>> ga -> sdfopen 8225_ESRL_1960-1990.nc
>> Scanning self-describing file: 8225_ESRL_190-1990.nc
>> SDF file 8225_ESRL_1960-1990.nc is open as file1
>> LON set to 84.375 165
>> LAT set to -48.5705 21.9044
>> LEV set to 0 0
>> Time values set: 1960:1:1:0 1960:1:1:0
>> E set to 1 1
>> ga -> sdfopen 08225.30yr.mean.stat.pp.nc is open as file 2
>> ga -> q file1
>> File 1: Monthly NOAA-CIRES 20th century Reanalysis V2
>>            Descriptor : 8225_ESRL_1960-1990.nc
>>            Binary: 8225_ESRL_1960-1990.nc
>>            Type = Gridded
>>            Xsize=44 Ysize=38 Zsize=1 Tsize=373 Esize=1
>>            Number of variables = 1
>>            tsoil 1 t.z.y,x Monthly Soil Temperature
>> ga -> q file2
>> File 2: Descriptor: 08225.30yr.mean.stat.pp.nc
>>           Binary: 08225.30yr.mean.stat.pp.nc
>>           Type = Gridded
>>           Xsize=174 Ysize=150 Zsize=1 Tsize=1 Esize=1
>>            Number of variables = 1
>>           soiltemp 1 t.z.y,x Soil Temperature (levels 2,3,4)
>> ga -> set gxout grfill
>> ga -> set lat -48.5705 21.9044
>> LAT set to -48.5705 21.9044
>> ga -> set lon 84.375165
>> LON set to 84.375165
>> ga -> set gxout grfill
>> ga -> run bluewhitered
>> Enter Min,interval,num of intervals, center
>> -5 1 12
>> ga -> d soiltemp.2 - tsoil.1
>> Data Request Warning: Request is completely outside file limits
>> Entire grid contents are set to missing data
>> Grid limits of file: X=1 174 Y-1 150 Z= 1 1 T=1 1 E =1 1
>> Grid limits of request: X = -167 17 Y=-8 153 Z = 0 0 T = -7511039
>> -7511039 E = 1 1
>> Warning issued for variable = soiltemp. 2
>> Operation error: Incompatable grids
>> Dimension ranges aren't equivalent
>> Dimension = 0
>> 1st grid range = -167 17 2nd = 1 44
>> Error ocurred at column 19
>> Expression = soiltemp.2 - tsoil.1
>>
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>>
>
>
> --
> Arlindo da Silva
> dasilva at alum.mit.edu
>
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