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Subject: RE: [emergency] Re: Circle and Polygon

My biggest problem is that I don't know all the uses for the information
in this spec.

Most all major GIS can handle coordinate/reference system
transformations so making the reference system id mandatory works for
them. (having said that - even if you can handle hundreds - you'll
always get one that you've never seen before) But I thought the major
users of CAP would be simple systems/devices which may not have that


David M. Danko
GIS Standards
Environmental Systems Research Institute, Inc.
8620 Westwood Center Drive
Vienna, VA 22182-2214
E-mail: ddanko@esri.com
Tel: 703-506-9515 x 8011
Mobile: 703-989-1863
Fax: 703-506 9514

-----Original Message-----
From: Renato Iannella [mailto:renato@nicta.com.au] 
Sent: Thursday, June 16, 2005 10:11 PM
To: Emergency_Mgt_TC TC
Subject: Re: [emergency] Re: Circle and Polygon

On 17 Jun 2005, at 00:35, Bullard, Claude L (Len) wrote:

> 1.  With the reference element, the software has a  standard way to 
> notice different systems.
> 2.  Without the reference element, the different  systems can't 
> interoperate.

I strongly agree with Len. Perhaps a good compromise is to add explicit 
information that indicates the spatial reference system used by the 
element, and that it is the external edge?

Eg <polygonExt srsName="urn:ogc:def:crs:OGC:1.3:CRS84"> 22, -22 .... 

In our case, we can state that the attribute is mandatory and fixed.

Cheers...  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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