[gradsusr] Problem templating nc files

[Jennifer Adams]

On Feb 15, 2013, at 12:36 PM, Jeff Duda wrote:

> Wow, the value of undef looks pretty ridiculous.  Are you sure of it? 
A better way to specify the undef value with netcdf is to use the attribute name. Something like this: 
UNDEF 1e20 missing_value

> Since all of your vars would use non-negative values, probably anything negative would suffice for the value of undef.  
Without the attribute name in the UNDEF entry, only the *actual* undef value will do. 
> 
> Your first time value in your TDEF line doesn't look to match the first times you want to plot.  It looks like you want to plot data from 1979, but your first time is in 1985, so you'd have to use negative time values to access that first file of data (which you didn't...you started chsub at 1).
Yes. Your TDEF and CHSUB dates don't match. 
> 
> Lastly, I assume you knew which years in that time were leap years so you used the correct numbers for each chsub entry.  If you change the things above and still have problems, recheck to make sure you have the correct number of time steps to represent each data file.
If you are still having trouble, please also include the output from 'ncdump -h' on one of your files, and the evidence for 'totally wrong' data values. The version of GrADS you're using would be helpful too. 
--Jennifer

> 
> Jeff Duda
> 
> On Fri, Feb 15, 2013 at 10:03 AM, Luis Blacutt <luis.blacutt at gmail.com> wrote:
> Dear all,
> 
> I have five nc files, I generated a ctl file to open them all as follows.
> 
> dset ^EraInterim%ch.nc
> chsub     1  4384 1979-1984
> chsub  4385  8766 1985-1990
> chsub  8767 13150 1991-1996
> chsub 13151 17532 1997-2002
> chsub 17533 21916 2003-2008
> chsub 21917 24776 2009-2012
> undef 200000004008175468544.000000
> options template little_endian yrev
> dtype netcdf
> xdef 36 linear 274.500000 1.500000
> ydef 46 linear -55.500000 1.500000
> zdef 1 linear 1 1
> tdef 24776 linear 06:00Z01jan1985 12hr
> vars 4
> t2m 0  t,y,x  2-metre temperature [K]
> cp  0  t,y,x  Convective precipitation
> lsp 0  t,y,x  Stratiform precipitation (Large-scale precipitation)
> tp  0  t,y,x  Total precipitation
> endvars
> 
> Apparently I succeeded, however the values I get are totally wrong. At this point I'm clueless, can anyone help me out?
> 
> Best regards
> Luis
> 
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> 
> 
> -- 
> Jeff Duda
> Graduate research assistant
> University of Oklahoma School of Meteorology
> Center for Analysis and Prediction of Storms
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--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jma at cola.iges.org



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