RE: [emergency] Re: Circle and Polygon

["Bullard, Claude L (Len)" <len.bullard@intergraph.com>]

1.  That suggests that CAP is to be used for NATO C2. 
It seems highly unlikely but I may be wrong. Even if so 
see 2.

2.  Having a single global coordinate reference is 
desirable but cannot be enforced.  Is it better to 
have the option and it be denoted or to not have 
an option and have either implementations that do 
not denote their variance or implementations that 
cannot use CAP?

It is usually a bad idea to attempt to enforce 
political will through technical standards.  It 
creates resistance at every level of decision making. 
This decision should be made by the stakeholders, so 
it is a good idea to get many more opinions from those 
who will be using CAP.

Art says this will remain open to discussion.  It will 
be wise to post a succinct description to as many of 
the stakeholders as can be identified and get their 
consensus.  OTW, this decision for better or worse 
will appear to have been made by the vendors represented 
on the WG.  If the stakes are as high as Mr. Danko suggests, 
then it is worth taking to the users.

len


From: David Danko [mailto:DDanko@esri.com]

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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