-----Original Message-----
From: geopriv-bounces at ietf.org
[mailto:geopriv-bounces at ietf.org] On Behalf Of Marc Berryman
Sent: Tuesday, July 29, 2008 6:57 AM
To: Hannes Tschofenig
Cc: geopriv at ietf.org; ecrit at ietf.org
Subject: Re: [Geopriv] Announce: Specifying Derived Location
in a PIDF-LO
As long as it clearly noted that the location is derived from
geodetic then I am fine. How to indicate? Provide both
geodetic and derived. If geodetic is provided then one can
safely assume the provided civic is derived (I would hope).
Marc B
-----Original Message-----
From: Hannes Tschofenig [mailto:Hannes.Tschofenig at gmx.net]
Sent: Tuesday, July 29, 2008 8:14 AM
To: Marc Berryman
Cc: Winterbottom, James; geopriv at ietf.org; ecrit at ietf.org
Subject: Re: [Geopriv] Announce: Specifying Derived Location
in a PIDF-LO
Hi Marc,
I agree with you that re-coding isn't the ideal solution.
Now, the question is: What do we do when someone still does
it? We are not the deployment police.
Should we indicate the fact that re-coding has happened? How
should we indicate it?
Ciao
Hannes
Marc Berryman wrote:
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
Aside from these concerns I did notice a few gramatical
inconsistancies in the draft.
Thanks,
Marc B
-----Original Message-----
From: geopriv-bounces at ietf.org [mailto:geopriv-bounces at ietf.org] On
Behalf Of Hannes Tschofenig
Sent: Tuesday, July 29, 2008 5:31 AM
To: Winterbottom, James
Cc: geopriv at ietf.org; ecrit at ietf.org
Subject: Re: [Geopriv] Announce: Specifying Derived Location in a
PIDF-LO
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
--------------------------------------------------------------
----------
------------------------
This message is for the designated recipient only and may
contain privileged, proprietary, or otherwise private
If you have received it in error, please notify the sender
immediately and delete the original. Any unauthorized use of
this email is prohibited.
--------------------------------------------------------------
----------
------------------------
[mf2]
--------------------------------------------------------------
----------
_______________________________________________
Geopriv mailing list
Geopriv at ietf.org
https://www.ietf.org/mailman/listinfo/geopriv
_______________________________________________
Geopriv mailing list
Geopriv at ietf.org
https://www.ietf.org/mailman/listinfo/geopriv
_______________________________________________
Geopriv mailing list
Geopriv at ietf.org
https://www.ietf.org/mailman/listinfo/geopriv