gancsetup error:

[Jennifer Adams]

On May 26, 2009, at 6:50 AM, Matias Mendez wrote:

> Hello GrADS users,
>
> I got 3-h NARR data (u-wind and v-wind at 10m, air temperature at 2m,
> mean sea level pressure) for the period 1979-2003, from this link:
>
> ftp://ftp.cdc.noaa.gov/Datasets/NARR/monolevel/
>
> I constructed ddf files to open data. It worked well, I could open,
> display and analize winds and temperature data. But when I tried to
> display mean SLP data I got this error message:
>
> ga-> d slp
> Notice:  Automatic Grid Interpolation Taking Place
> gancsetup error: Variable slp not in netcdf file

The variable in the file is called "prmsl"  --  if you want to rename
it to 'slp' you must create an alias in your descriptor file:
prmsl=>slp  0  t,y,x  3-hourly Pressure at Mean Sea Level

Same problem with glat and glon:
lat=>glat 0 y,x latitude coordinate
lon=>glon 0 y,x longitude coordinate

--Jennifer

>
> Data Request Error:  Error for variable 'slp'
>  Error ocurred at column 1
> DISPLAY error:  Invalid expression
>  Expression = slp
>
> What does this mean?, how can I fix it?.
>
>
> This is its DDF:
>
> dset /home2/PROCLIMA/NARR/d-MSLP/prmsl.2003.nc
> dtype netcdf
> UNDEF -9999.0 missing_value
> UNPACK scale_factor add_offset
> PDEF 349 277 lcc 1 -145.5 1 1 50 50 -107 32463.41 32463.41
> XDEF 1025 linear 150 0.2
> YDEF  425 linear   2 0.2
> ZDEF 1 levels 0
> tdef 2920 linear 00z01jan2003 3hr
> vars 3
> slp  0 t,y,x MSLP 3hr
> glat 0 t,y,x Latitude
> glon 0 t,y,x Longitude
> endvars
>
>
> I'm using GrADS v1.9b4. I'll thank you so much your help.
>
> Regards,
> Matias

--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jma at cola.iges.org



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