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Subject: RE: [emergency] Re: Circle and Polygon
Offhand, I would say that including validation checks as a mandatory
item in RFPs also makes sense to me. Assuming that good practices
will be followed sounds like a train wreck waiting to happen. Making
demonstrable, and accurate interoperability with a given set of CRS
might give a few vendors heartburn, and make some project managers
grumble, but, while it isn't trivial by any means, it aint QUITE
rocket science or brain surgery. It may be just a bit more important
at the time of response coordination, though.
Ciao,
Rex
At 8:43 AM -0500 6/16/05, Bullard, Claude L (Len) wrote:
>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
>