Re: 20020815: decoding Japanese Met Agency thinned grids into netCDF

• To: Tony Eckel <teckel@xxxxxxxxxxxxxxxxxxxxxxxxx>
• Subject: Re: 20020815: decoding Japanese Met Agency thinned grids into netCDF
• From: Robb Kambic <rkambic@xxxxxxxxxxxxxxxx>
• Date: Tue, 20 Aug 2002 09:41:10 -0600 (MDT)

On Thu, 15 Aug 2002, Unidata Support wrote:

------- Forwarded Message

>To: support@xxxxxxxxxxxxxxxx
>From: Tony Eckel <teckel@xxxxxxxxxxxxxxxxxxxxxxxxx>

>Subject: handling thinned grids >Organization: University of Washington

>Keywords: 200208142238.g7EMc5K14065 Japanese Met Agency thinned grids gribtonc

Hello,

I was wondering if you might know how to handle thinned lat/lon grids.
I am trying to use gribbed global data from the Japanese Meteorological
Agency and the data is thinned by row as you head toward the poles (to
conserve space).  Do you have a routine that can convert such data into
a regular lat/lon grid (i.e., fill in the thinned part), and write back
out to either grib or NETCDF?

Tony,

Sorry for the late reply, I've been on vacation.  I don't know anything
about Japanese Met Agency thinned grids but gribtonc does work with
thinned grids. It uses the -q flag to do the interpolation of the grids, a
entry from the LDM pqact.conf file would look like this:

# AVN model on thinned grids, interpolated to global 5.0 x 2.5 regular
grid
HRS     ^H.[I-P]... KWB. (..)(..).*(/mAVN|/mSSIAVN)
       PIPE    /usr/local/ldm/decoders/gribtonc
       -q "lin,dlat=2.5,dlon=5.0" etc/avn-x.cdl
       data/GRIB/(\1:yy)(\1:mm)\1\2_avn-x.nc

As I stated, it depends if the grid follows the "regular" conventions,

The decoders page is located at:

http://www.unidata.ucar.edu/packages/decoders/

You might get some hints from the Seachable archives on the page using
thinned or quasi keywords.


Robb...

Thanks for any help you can provide.

Tony Eckel

(206)-543-9144          
teckel@xxxxxxxxxxxxxxxxxxxx             
408 Atmospheric Sciences - Geophysics Bldg
University of Washington
Box 351640
Seattle, WA 98195-1640


------- End of Forwarded Message

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