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Subject: RE: [emergency] Circle and Polygon

With the size and complexity of the polygons that represent jurisdictional
boundaries, I fear that the GML polygon representation would become
prohibitively large. Some applications are already having problems ingesting
the large messages containing the simplified version for complex polygons.


Patti Iles Aymond, PhD
Senior Scientist
Bioterrorism Preparedness & Response

Innovative Emergency Management, Inc.
Managing Risk in a Complex World

8555 United Plaza Blvd.   Suite 100
Baton Rouge, LA 70809
(225) 952-8228 (phone)
(225) 952-8122 (fax)

-----Original Message-----
From: Art Botterell [mailto:acb@incident.com] 
Sent: Friday, June 10, 2005 12:40 AM
To: Emergency_Mgt_TC
Subject: Re: [emergency] Circle and Polygon

On Jun 9, 2005, at 7:57 PM, Renato Iannella wrote:
> Again, my GML expert friend says that a polygon would look like:
> <gml:Polygon>
>    <gml:exterior>
>        <gml:LinearRing>
>            <gml:pos>12 4</gml:pos> <gml:pos>12 8</gml:pos> ...
>        </gml:LinearRing>
>    </gml:exterior>
> </gml:Polygon>

Hmmm.  I think one of the keys to the early update of CAP has been  
that simple concepts are represented in simple ways.

Other folks may feel differently, but I'm not certain the EDXL  
routing application really needs the full functionality provided by  
this much bulkier representation.  E.g., in the past we've handled  
included polygons... which much more often involve different  
information or instructions than mere exclusion... by overriding them  
with other blocks referencing other simple polygons.

So it sounds like the TC may need to revisit the question of whether  
we want to follow the GML standards in full, or some other precident,  
or stick to a simplified model.

- Art

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