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


We agreed early on in CAP to stick to one global coordinate reference
system to remove all chance of mis-communication. I think this was/is
the right thing to do. NATO and most military coalitions that need to
interoperate have settled on this method. There have been many deadly
mistakes caused by a misunderstanding of CRSs.

If there is a requirement to use different reference systems I suggest
they be -in addition to - Or - it be very apparent that a non-standard
CRS is being used. Users should not be able to get to the coordinates
without knowing what CRS is being used.

Dave

David M. Danko
GIS Standards
Environmental Systems Research Institute, Inc.
8620 Westwood Center Drive
Vienna, VA 22182-2214
USA
E-mail: ddanko@esri.com
Tel: 703-506-9515 x 8011
Mobile: 703-989-1863
Fax: 703-506 9514
-----Original Message-----
From: Carl Reed [mailto:creed@opengeospatial.org] 
Sent: Wednesday, June 15, 2005 12:42 PM
To: acb@incident.com
Cc: emergency@lists.oasis-open.org
Subject: Re: [emergency] Re: Circle and Polygon

Art -

You still appear to be missing the point. We can leave CAP and EDXL with
WGS 84 as the default (but not mandatory!) so that all existing
implementations work and the level of "simplicity" being sought is
maintained. We are suggesting optional elements that would allow folks
to
use other than WGS 84 as the only CRS. This provides implementation
flexibility and allows different regions in the world to implement as
they
see fit for their region.
Cheers

Carl


> On Jun 15, 2005, at 6/15/05 12:12 AM, Renato Iannella wrote:
>> One of other key benefits from reusing GML is their use of spatial
>> reference system pointers.
>> Without the spatial reference system pointer, we will not be able
to
>> work
>> across jurisdictional boundaries who use different coordinate
>> systems, or with many legacy data sources.
>
> Again, I wonder whether that might just be making life unnecessarily
> difficult.  As it is we specify a single, global coordinate system,
> and folks who use different ones can handle the necessary conversions.
>
> - Art
>
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