Re: 20040317: avn to gfs cdl files

• To: Ruth Platner <rlp@xxxxxxxxxxxxxxxxxxxx>
• Subject: Re: 20040317: avn to gfs cdl files
• From: Robb Kambic <rkambic@xxxxxxxxxxxxxxxx>
• Date: Fri, 19 Mar 2004 13:30:18 -0700 (MST)

On Fri, 19 Mar 2004, Ruth Platner wrote:

Hi Rob,

Thanks for the cdl file.

I'm not sure I know how to create 1.25 raw data from the ldm feed, and
the ldm is the source of my data.

For the older decoders I had an entry like this in my pqact file:

HRS  ^H[UVHRP][I-P]... KWB. (..)(..).*(/mAVN|/mSSIAVN)
     PIPE    /usr/local/ldm/decoders/bin/gribtonc
     -q "lin,dlat=1.25,dlon=1.25" decoders/etc/avn-1.25x1.25.cdl
     data/GRIB/(\1:yyyy)(\1:mm)\1\2_avn-1.25x1.25.nc

Ruth,

Create raw file using FILE action in the pqact.conf with following entry:

HRS     ^H[UVHRP][I-P]... KWB. (..)(..).*(/mAVN|/mSSIAVN)
        FILE    data/GRIB/(\1:yyyy)(\1:mm)\1\2_gfs_37-44.wmo

Here's how to create the 1.25 cdl

% gribtocdl -v  -q "lin,dlat=1.25,dlon=1.25" < "raw file from above" >
gfs-1.25x1.25_37-44.cdl

You will still have to edit the cdl to make it 100% correct.

Robb...

I thought gribtonc was doing some interpolating because the -q
"lin,dlat=1.25,dlon=1.25" was an option to gribtonc. I think if i just
save everything that I get from HRS  ^H[UVHRP][I-P]... KWB.
(..)(..).*(/mAVN|/mSSIAVN) into a file for a date, that it won't really
be 1.25 data. I'm not sure at all, but since I could get 2.5, 1.25 and 1
degree resolution from the same grib data, I thought it was gribtonc that
was doing the interpolating.

I could try saving all the grib data as above into a file and see what
gribtocdl does with it, but how it would create a 1.25 data file I don't
know. I have used gribtocdl before for existing grib files, but I'm a
little confused about how this would work.

Thanks some more,

Ruth


Robb Kambic wrote:
      On Wed, 17 Mar 2004, Unidata Support wrote:

      >
      > ------- Forwarded Message
      >
      > >To: support-decoders@xxxxxxxxxxxxxxxx
      > >From: Ruth Platner <rlp@xxxxxxxxxxxxxxxxxxxx>
      > >Subject: avn to gfs cdl files
      > >Organization: UCAR/Unidata
      > >Keywords: 200403172118.i2HLI4rV029423
      >
      > Hi,
      >
      > The new  decoders, decoders-3.0.2, came with new cdl files.
      The file
      > avn-x.cdl was replaced with gfs_37-44.cdl. I'm wondering if
      there are
      > similar ready to go replacements for avn-1.0x1.0.cdl and

      Hiya,

      I attached gfs-1.0x1.0_3.cdl for the 1 degree grid, it might
      needs some
      minor modifications to make it 100% correct.  I don't have
      any
      1.25 raw data to make that one. You can make the cdls
      yourself with the
      gribtocdl program. When making the 1 degree, I found some
      bugs in the
      gribtocdl program so I need to make a new release. It was
      missing some
      level info in the program.  So release decoders-3.0.3 should
      be able to
      create the 1.25 one. Will let you know when I completed the
      release.

      Robb...

      > avn-1.25x1.25.cdl.
      >
      > Thanks for your help,
      >
      > Ruth
      >
      > --
      >
      
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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/
      
==============================================================================


      ------------------------------------------------------------------------
                                 Name: gfs-1.0x1.0_3.cdl
         gfs-1.0x1.0_3.cdl       Type: Plain Text (TEXT/PLAIN)
                             Encoding: BASE64
                          Description: gfs-1.0x1.0_3.cdl

==============================================================================
Robb Kambic                                Unidata Program Center
Software Engineer III                      Univ. Corp for Atmospheric Research
rkambic@xxxxxxxxxxxxxxxx                   WWW: http://www.unidata.ucar.edu/
==============================================================================