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Subject: RE: [emergency] Circle and Polygon

I asked my GIS programmers the same question.  Their response was that
they could live with it either way, but that they actually found it
easier to program against ti the way it is now.  
On the other hand more structure makes it easier to validate prior to
programming.  And... The GJXDM is more like what Dr. Iannella has
suggested.  Folks?....

Gary A. Ham 
Senior Research Scientist
Battelle Memorial Institute
540-288-5611 (office)
703-869-6241 (cell)
"You would be surprised what you can accomplish when you do not care who
gets the credit." - Harry S. Truman

-----Original Message-----
From: Renato Iannella [mailto:renato@nicta.com.au] 
Sent: Wednesday, June 08, 2005 1:41 AM
To: Emergency_Mgt_TC TC
Subject: [emergency] Circle and Polygon

The "Circle" element defines a substructure of "longitude, latitude 
The "Polygon" element defines a substructure of "longitude, latitude 
longitude, latitude..."

Q1: It would be useful to define a re-useable structure for longitude 
and latitude that is
used for both elements.
It would end up like this:
     <long>38.333</long> <lat>-122.333</lat>
     <long>38.333</long> <lat>-122.333</lat>
     <long>33.333</long> <lat>-13.333</lat>

Q2: The "Polygon" element states that the first long/lat pair is 
repeated at the end of the list.
If this necessary? That is, we can assume that if it is a Polygon, the 
last long/lat pair will
have to join to the first?


Dr Renato Iannella
Project Leader, NICTA, Brisbane, QLD, AUSTRALIA
P: +61 7 3000 0484 F: +61 7 3000 0480 M: +61 4 1313 2206
E: renato@nicta.com.au W: http://nicta.com.au

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