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Subject: RE: [emergency] Re: Circle and Polygon
Automated emergency systems that 'forget' that
there is a different geo-referencing system in
use by an allied system? It's hard to make
a computer forget; it's easy to make it not notice.
Software is more likely to not notice a data error
if its designers assume one system holds for all
applications rather than building in validation checks.
"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."
Interoperability is a transient state of information
ecosystems. Reliable partners manage transitions
equitably.
len
From: Ham, Gary A [mailto:hamg@BATTELLE.ORG]
I can state for the record that he military is at least expiimenting
with CAP. It is part of several ongoing trials in this year's Coalition
Waarefare Interoperability Demonstration (CWID) going on this very week.
From: David Danko [mailto:DDanko@esri.com]
I didn't mean to imply that NATO C2 would be using CAP. I just meant
that the military - having probably the most experience passing
coordinates around - has learned that using one CRS works the best for
passing coordinates. Although developed by the military - it's heavily
used outside the military. The International Civil Aviation Organization
(ICAO) has settled on WGS 84 for air navigation systems see
www.WGS84.com and it's the CRS used by GPS.
http://everything2.com/index.pl?node=WGS%2084
I have seen it happen many times where people "forgot" or didn't realize
their information was in a different reference system. I was just
looking at this as a communication issue. In an emergency situation one
may not have the time to realize there is a miscommunication and go back
and fix it.
I agree we need to get the opinions of users - we should also include
some geodesist. I certainly don't know all the uses for CAP. It may very
well be used for high precision positioning where a local system may
work the best - we'll have to see what the users want.
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