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19990131: hemispheric grids in GEMPAK/GARP

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  • Subject: 19990131: hemispheric grids in GEMPAK/GARP
  • Date: Mon, 01 Feb 1999 11:24:52 -0700
>From: address@hidden (Gary Lackmann)
>Organization: .
>Keywords: 199901311240.FAA05496

>Dear Support,
>
>I am writing to call a problem to your attention regarding the
>hemispheric grids sent via the LDM.  Specifically, the AVN and
>MRF products, when viewed on the Northern Hemispheric domain,
>exhibit a "break" near the Greenwich Meridian.  This is possibly
>due to the absence of a "wrap" gridpoint in the decoder software
>for GEMPAK.  I am concerned because it may be that the fields
>are shifted relative to their true location by a fraction of
>a gridpoint.
>
>Thank you much for your continued excellent efforts in providing
>data to the university community, and for any efforts made in
>attending to this problem.
>
>Sincerely,
>
>Gary Lackmann
>
>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>= Gary M. Lackmann                                                        =
>= Assistant Professor                                                    =
>= Department of the Earth Sciences                                        =
>=                                                                         =
>= State University of New York phone: (716) 395-2603                     =
>= College at Brockport         fax:   (716) 395-2416                     =
>= Brockport, NY  14420         E-mail: address@hidden       =
>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>

Gary,

The wrapping point for the AVN thinned grids (eg 1.25x.125 degree grids is
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 using
where you see this behavior?

Thanks,

Steve Chiswell