trouble with using template with forecast files

[Jennifer Adams]

Hi, Roz --
Your templated descriptor file should have the following entries:

DSET ^%iy4%im2%id2%ih2.AWIPSF%f2.tm00.sg
OPTIONS template
TDEF 7 linear 00z14oct2008 6hr

I feel it's worth the effort to make your metadata as accurate as
possible. Use an accurate number of time steps -- why say you have
999 time steps when in reality you only have 6? Actually, the correct
way to set up this forecast data set is to put 7 in the TDEF entry
because the 00hr time step, although not present in your list of data
files, is essential for resolving the %iy, %im, %id, and %ih
substitution strings properly in your file names. Plus it just makes
sense to have the first time step of your forecast data set be the
initialization time, even if you don't have any data. GrADS will just
set the first time step to missing -- you'll need to 'set t 2' before
being able to display a variable. Don't forget you must also rerun
gribmap if you change any of the grid definition or variable entries
in your descriptor file. Use the -v option with gribmap and check to
make sure everything is matching properly for each data file.

--Jennifer




On Oct 16, 2008, at 12:08 PM, Roz MacCracken wrote:

> Hi All,
>
> I am trying to create a templated control file for a couple of
> forecast
> files.
>
> I have files with the name:
> 2008101400.AWIPSF06.tm00.sg - 2008101400.AWIPSF36.tm00.sg (there
> are 6 files
> total).  I have created control files called:
> eta6.awipsf06.ctl - eta6.awipsf36.ctl  (mainly because I can't get the
> %f2 option to work in my grads scripts.)
>
> Then, I created an index file called eta6.awipsf06.idx, using:
> gribmap -i eta6.awipsf06.ctl,
> which was created without errors.
>
> I can display data using the respective control file, pointing
> at the corresponding index file.  (this is without templating).  So,
> the control files do display data without templating.
>
> I have changed the dset line in the control file to:
> dset ^%y4%m2%d2%h2.AWIPSF06.tm00.sg, changed tdef to 999,
> and have added the "options template" to the control file.
>
> I have 2 questions..fairly easy, but, I can't get this to work...
>
> First, when I change the control file to the dset, and "options
> template"
> above, and "set t 1", I get the error, "Undefined Grid", with no data.
> Is there something that I've missed doing in my control file so that
> I can display data using a template?
>
> Should I have changed the dset to %y4%m2%d2%h2.AWIPSF%f2.tm00.sg?
> And,
> if this is a better way, how do you set the date within a
> grads script to get it to display the forecasted time?
> (i.e., "set time 12Z14Oct2008(f=12)"...that may not be right...)
>
> Thanks.
>
> Roz MacCracken
>
> Sample of part of the control file:
>
> dset /ETA6/%y4%m2/%y4%m2%d2%h2.AWIPSF06.tm00.sg
> index /ETA6/ctl/maps/test.AWIPSF06.tm00.sg.idx
> undef 9.999E+20
> title 2008100100.AWIPSF06.tm00.sg
> *  produced by grib2ctl v0.9.12.5p41
> dtype grib 212
> options template
> pdef 185 129 lcc 35.0 -95.0 105 49 25 25 -95 40635 40635
> xdef 181 linear -140 0.5
> ydef  91 linear  15 0.5
> tdef 100 linear 00Z01oct2008 1dy
> zdef 1 linear 1 1
> vars 31
> ACPCPsfc  0 63,1,0  ** surface Convective precipitation [kg/m^2]
> ALBDOsfc  0 84,1,0  ** surface Albedo [%]
> APCPsfc  0 61,1,0  ** surface Total precipitation [kg/m^2]
> BGRUNsfc  0 234,1,0  ** surface Baseflow-groundwater runoff [kg/m^2]
> CAPEsfc  0 157,1,0  ** surface Convective Avail. Pot. Energy [J/kg]
> CFRZRsfc  0 141,1,0  ** surface Categorical freezing rain [yes=1;no=0]
> CICEPsfc  0 142,1,0  ** surface Categorical ice pellets [yes=1;no=0]
> CNWATsfc  0 223,1,0  ** surface Plant canopy surface water [kg/m^2]
> CRAINsfc  0 140,1,0  ** surface Categorical rain [yes=1;no=0]
> etc....

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



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