Re: [emergency] Circle and Polygon

["Carl Reed OGC" <creed@opengeospatial.org>]

Gary and Folks -

I would encourage us to look toward compatibility with the OGC GML standard. 
Not that I have a bias :-) But, having recently dug around a bit, GML 
geometry constructs for point, circle, and polygon are also used in a 
variety of other standards, such as the Mobile Location Platform API, 
PIDF-LO, and TransducerML (sensor alerts). The reason I mention this is that 
it is quite conceivable that an alert message that will eventually get 
encapsulated into EDXL (or CAP!) will come from an environment that  uses 
one of these other standards. FYI, MLP is the Gateway protocol that many 
carriers use as part of their location positioning infrastructure. 
Harmonization across standards of how geometry is expressed greatly eases 
implementation pain.

That said, I would like to have the GML gurus in the OGC take a look at the 
circle/polygon constructs in EDXL and provide feedback. I can have this done 
as part of our Technical Committee F2F next week.

Regards

Carl

----- Original Message ----- 
From: "Ham, Gary A" <hamg@BATTELLE.ORG>
To: "Renato Iannella" <renato@nicta.com.au>; "Emergency_Mgt_TC TC" 
<emergency@lists.oasis-open.org>
Sent: Wednesday, June 08, 2005 5:52 AM
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
> radius".
> 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:
>   <circle>
>     <long>38.333</long> <lat>-122.333</lat>
>     <radius>12</radius>
>   </circle>
>   <polygon>
>     <long>38.333</long> <lat>-122.333</lat>
>     <long>33.333</long> <lat>-13.333</lat>
>     ...
>   </polygon>
>
> 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?
>
>
> Cheers...
>
> 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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