19990131: hemispheric grids in GEMPAK/GARP

Gary,

I see what you are refering to in your plot, however, I
do not get the same results when I use your file here.

This might be peculiar to your platform, though I have
tested under SGI, HP, and Sun here. It could also be you are
missing a patch somewhere along the way.

Can you provide me with the following information:
What platform/OS are you using?
Do you see the same result when you use gdcntr?
What version of Garp are you using?

Steve Chiswell
Unidata User Support


>From: address@hidden (Gary Lackmann)
>Organization: .
>Keywords: 199902012236.PAA14562

>Steve,
>
>I placed two images (one for mrf, one for avn) and the
>mrf gempak grid file in your ftp directory under 
>the subdirectory ~/gbuddy/incoming/sunyb  
>
>Thanks for any help/ideas on how to solve this.
>
>Gary
>
>> 
>> 
>> Gary,
>> 
>> I am looking at the 500mb heights and surface pressure grids 
>> from the avn thinned grids in both gdcntr and Garp 2.01 and don't
>> see any line breaks in the contour field around 30W which is the
>> wrap point for the thinned grids. The thinned grids are in 8
>> pieces and get stitched together in the gempak grid file by dcgrib.
>> I also looked at the f084 500mb height for the MRF and that looks OK to.
>> 
>> If you can post a few gifs, that would help me see what you are looking at.
>> I may need to look at the same grid file you are looking at too.
>> If you can post that to ~gbuddy/incoming that might be useful.
>> 
>> Steve Chiswell
>> Unidata User Support
>> 
>> >From: address@hidden (Gary Lackmann)
>> >Organization: .
>> >Keywords: 199902012039.NAA11198
>> 
>> >> 
>> >> Gary,
>> >> 
>> >> The wrapping point for the AVN thinned grids (eg 1.25x.125 degree grids i
> s
>> >> 30W, not near the Greenwhich meridian. This is the global AVN data set.
>> >> 
>> >> Is this the AVN data set you are refering too?
>> >> 
>> >> Can you provide me with the program input and file data type you are usin
> g
>> >> where you see this behavior?
>> >> 
>> >> Thanks,
>> >> 
>> >> Steve Chiswell
>> >> *************************************************************************
> ***
>> >> Unidata User Support                                    UCAR Unidata Prog
> ram
>> >> (303)497-8644                                                  P.O. Box 3
> 000
>> >> address@hidden                                   Boulder, CO 80
> 307
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>    
>> >> *************************************************************************
> ***
>> >> 
>> >Hi Steve,
>> >
>> >The decoder program is dcgrib and the file type is gempak.  Both the
>> >MRF and AVN_thin grids exhibit this behavior when viewed using GARP.
>> >The MRF breaks at the meridian, and the AVN is broken at 30W.  If you
>> >like, I can save a few example gifs out of garp and post them on our
>> >web page, or for ftp.  Also, I could place an example grid file in the
>> >anonymous ftp directory if that would help.
>> >
>> >The pattern-action we use for the MRF is shown below:
>> >
>> >HRS     ^H[HPUV][EF][A-Z][0-9][0-9] KWB. ([0-3][0-9])([0-2][0-9])..
>> >        PIPE    /weather/ldm/gempak/NAWIPS/bin/sol/dcgrib
>> >                -d data/gempak/logs/dcgrib.log
>> >                -g /weather/ldm/gempak/NAWIPS/gempak5.4/tables
>> >                PACK data/gempak/hds/YYMMDDHH_mrf.gem
>> >
>> >The AVN exhibits the same behavior (except breaks at 30 instead
>> >of the Greenwich meridian) when viewed in GARP.
>> >
>> >HRS     ^H.[I-P]... KWB. ([0-3][0-9])([0-2][0-9]).*
>> >        PIPE    /weather/ldm/gempak/NAWIPS/bin/sol/dcgrib
>> >                -d data/gempak/logs/dcgrib.log
>> >                -g /weather/ldm/gempak/NAWIPS/gempak5.4/tables
>> >                -q"lin,dlat=2.5,dlon=2.5"
>> >                PACK data/gempak/hds/YYMMDDHH_thin.gem
>> >
>> >
>> 
>> ****************************************************************************
>> Unidata User Support                                    UCAR Unidata Program
>> (303)497-8644                                                  P.O. Box 3000
>> address@hidden                                   Boulder, CO 80307
>> ----------------------------------------------------------------------------
>> Unidata WWW Service                        http://www.unidata.ucar.edu/     
>> ****************************************************************************
>> 
>