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19990127: Question regarding AREA file display

Dan,

I do not know about your data sets.
GEMPAK reads the projection information from the AREA file,
so it is not required that they be in native satellite
projections. For instance, we have several images
which are displayed in Mercator and Polar steareographic projections.
Perhaps your data is in some other projection that GEMPAK
doesn't know about with respect to AREA files. For
instance, I don't think Lambert is supported for AREA files
though it is for GINI files.

Jim Cowie at COMET has done a lot of the work on the imar2gm.f
routine which handles the projection or AREA files. Maybe he
can shed some light.

Steve Chiswell
Unidata User Support

On 27 Jan 1999, Dan Baumgardt wrote:

> 
>      Hi Steve - 
>      
>      I am the NWS-SOO at La Crosse WI.  I ran across your name in the 
>      GEMPAK code and wondered if you may be able to help give me some 
>      insight into a problem I am researching.  I appreciate your time or 
>      any reply you may be able to send me.
>      
>      I am trying to display McIDAS AREA files in GEMPAK.  However, the AREA 
>      files are 10x10km GOES sounder DPI files.  Using GPMAP, everything 
>      displays correctly and the data loads, however it is mapped 
>      incorrectly over the GULF of Mex versus the ECONUS.
>      
>      Have you had any experience with this sounder data display?  I thinh 
>      this symptom presents itself when you stray from standard GOES 
>      resolutions.  I searched up and down in the GEMPAK code/tables to try 
>      and find an area to alter for this but cannot find any.
>      
>      Bob Rabin, who works at CIMSS in MSN,WI, said this worked:
>      
>      >>I took the easy way out. I remmaped the LI/PW images to 4x4 km 
>      >>(using a G8/band 4 image as a template). When displaying the 
>      >>remapped images in GEMPAK, the maps came out correctly.
>      
>      But that is on the McIDAS side of the house.  Is there anything you 
>      know of on the GEMPAK side of the house I could try?
>      
>      I really appreciate any response you could give me.
>      
> ...........................................................
> Dan Baumgardt                    National Weather Service 
> Science and Operations Officer   N2788 County Road FA
> Phone: 608-784-8275 x766         La Crosse WI 54601
> Fax: 608-784-8238                email: address@hidden
>      
>      
>