Re: 20040506: netCDF Decoders - Sun UNIX - CDLs
On Thu, 6 May 2004, Unidata Support wrote:
> ------- Forwarded Message
> >To: support-decoders@xxxxxxxxxxxxxxxx
> >From: "Beth Hall" <bhall@xxxxxxx>
> >Subject: netCDF Decoders - Sun UNIX - CDLs
> >Organization: DRI
> >Keywords: 200405070023.i470NhxJ020678 netCDF decoders gribtonc CDL
> Institution: Desert Research Insitute
> Package Version: decoders-3.0.3
> Operating System: Sun UNIX
> Hardware Information: Sun
> Inquiry: I'm trying to access data from the ldm feed, partiticularly
> the GFS data. I feel very lost, but finally found the gribtonc
> command. I originally used the gfs_211.cdl file, but it gave me no
> lat/lon coordinates, just x and y.
No lat/lon are given because of rounding errors, no accurate values. The
lat/lon are mainly for human information.
With this cdl, the ncdump -h said
> there were 21 records (I'm assuming this refers to the forecasts,
Your correct the records are for forcast times:
valtime_offset = 0, 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, 78,
84, 90, 96, 102, 108, 114, 120 ;
I did some web searching and found that there were other
> CDLs including a 1 degree CDL.
The 1 degree grids are only on the CONDUIT feed, not the standard NOAAPORT
I tried it along with the
> gfs_21-24.cdl, gfs_25-26.cdl, and the gfs_37-44.cdl. Several of those
> actually have the lat/lon coordinate information, but now show 0
> records (no forecast data?).
Maybe you don't have the correct pqact entries, here's the ones we are
using. Remember the white spaces are tabs between the parts of the
# GFS model on global 5.0 x 2.5 degree grids
HRS ^H.[A-D]... .... (..)(..).*/m(SPEC62MRF|MRF)
# GFS model on global 5.0 x 5.0 degree grid
HRS ^H.[EF]... KWB. (..)(..)
# GFS model on thinned grids, interpolated to global 5.0 x 2.5 regular
HRS ^H.[I-P]... KWB. (..)(..).*(/mAVN|/mSSIAVN)
-q "lin,dlat=2.5,dlon=5.0" etc/gfs_37-44.cdl
I know the data must be there, but clearly
> don't understand what these different CDLs are doing, which one I
The cdl file are templates for making the NetCDF files, the number
designation at the end of the cdl refers to the grib sections ie 21-24
that are stitched together to form the whole grib file.
> should use, and which ones give me the lat/lon coordinate information.
> Can you help? Thanks.
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Robb Kambic Unidata Program Center
Software Engineer III Univ. Corp for Atmospheric Research
rkambic@xxxxxxxxxxxxxxxx WWW: http://www.unidata.ucar.edu/