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I see very real issues with deriving a civic location
from a geodetic location, when wireless geodetic locations became widely
available this “reverse geocoding” caused many problems. Personally
I see no value but many issues that can come about from a derived civic
location. I will try to expand on these issues (while not being
able to draw pictures to illustrate) from a “Lessons Learned”
aspect. 1.) Geodetic location comes in and a civic location is
derived from the nearest know civic location, but the geodetic location is
centered on a building in a large campus or a large apartment building. The
nearest civic location is the entrance to the large campus or apartment
complex, so you have lost desirable information of the more precise location in
favor of the civic location given to the campus or apartment building. 2.) Same scenario as above, but this time the nearest
civic location is NOT the same as the civic location provided to the apartment
complex or campus. The nearest civic location is provided and a delayed
response is caused by providing the incorrect civic location. 3.) A geodetic location come in from a boat in the
lake, river, or bay. The derived civic location is a home on the lake, river,
or bay. Delayed response due to incorrect location being provided. 4.) Vehicle on interstate highway (limited access
highway) provides geodetic location, derived civic location is along the
highway but a delayed response takes place because not only is the civic
location derived incorrect but the responding agency has to drive miles to gain
access to the limited access highway when the correct responding agency is near
the access point of the limited access highway. I could and can go on and on on scenarios that can
(and have) occurred due to derived locations, but let me put forth another
consideration. The service providing the derived location is using a
spatial dataset, but it is not being maintained to the same level as the
spatial data being used at the PSAP, out of date information is passed to the
PSAP - LIBALITY ISSUE. We update our spatial data on a minute by minute basis,
with literaily hundreds of changes taking place each day. There are just so
many little differences that could exist between the derived location and the
actual location provided by a trained call taker, that is familiar with the
local geography, that this could easily become a disaster and gain major news
coverage that could deal the industry and the confidence of the public a significant
setback. Aside from these concerns I did notice a few
gramatical inconsistancies in the draft. Thanks, Marc B -----Original Message----- Sounds like a useful way to indicate the derived
location Winterbottom, James wrote: > >
http://tools.ietf.org/html/draft-winterbottom-geopriv-derived-loc-00 > > > > Specifying Derived Location in a PIDF-LO > > > > Abstract > > This document describes how specify that a
location in a PIDF-LO has > been derived or converted from a different
location. The source > location may reside in the same PIDF-LO or be
a remote document > referenced by a location URI and associated id
fragement. > > > > > > Feedback appreciated. > > > > Cheers > > James > > > > > > >
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