20020903: WXP unable to navigate Mollweide McIDAS AREA files

>From: Daniel Vietor <address@hidden>
>Organization: Unisys
>Keywords: 200209010444.g814i3Z11395 Unidata-Wisconsin Mollweide

Dan, Jim, Ben,

>Jim Koermer wrote:
>> Have their been any changes in the global composite mcidas satellite
>> area files in the past week?
>> 
>> The WXP xsat program for the past few days has not been able to center
>> the data in a script that I have been using for several years. The
>> navigation seems to have changed (see attached example).

>I know xsat has problems with the global AREA file.  I was unaware of 
>this until someone pointed it out a couple of weeks ago.  SSEC changed a 
>couple of the parameters which specify resolution.  This prevented xsat 
>from overlaying a map.  I have since fixed that problem.

I sent out a query to SSEC to see if anything specific had been done
to process that generates the Mollweide composites contained in the
Unidata-Wisconsin datastream.  Here is the inquiry I made and the
reply I got:

  >From address@hidden Tue Sep  3 09:18:13 2002
  >To: address@hidden
  >Subject: Re: 20020803: changes to the Mollweide Unidata-Wisconsin imagers?
  
  Unidata Support wrote:
  
  > Hi Jerry,
  > 
  > I got an email from a site on Sunday that asks if there has been any
  > changes to the Mollweide IR image that is in the Unidata-Wisconsin
  > datastream.  I told the person that new scripts for generating the
  > stream were being developed on the machine that will replace gold,
  > but I was not aware of any modifications to the processes on gold
  > itself.  So, my question is whether or not there has been a change
  > in the process that is creating the Mollweide images on gold?
  
  >Jerry

  Not that I am aware of .... I did upgrade McIDAS on the machine that
  generates the composites (not gold.)  The images look fine on that
  machine, and on gold before they are sent.  I'll check to see if any
  nav changes were made for the Mollweide projection in the latest McIDAS
  version.

What I can add to this is that we do not see a problem in displaying
or navigating the Mollweide global composites in either McIDAS or GEMPAK.

>I'm not sure about the off-center problem.  Since I don't have access to 
>these files, I cannot test this out.

I can make as many of these images available to you as you want/need.
I can give you information about the Mollweide projection as extracted
from McIDAS code.  Please let me know.

>Also, both Jim and Ben are running on FreeBSD which the WXP binaries are 
>rather old.  I don't currently have a compile and test platform for this 
>OS so until I do, I cannot get you fixed binaries.

So, perhaps the navigation problem is a non-issue for current code?

Tom