FYI: Representation of Uncertainty and Confidence in PIDF-LO

Representation of Uncertainty and Confidence in PIDF-LO
Martin Thomson and James Winterbottom (eds), IETF Internet Draft

Members of the IETF Geographic Location/Privacy (GEOPRIV) Working
Group have published a Internet Draft for "Representation of Uncertainty
and Confidence in PIDF-LO." RFC 4119 defines "A Presence-based GEOPRIV
Location Object Format" (PIDF-LO), where the Presence Information Data
Format (PIDF) is an XML-based format designed for communicating
privacy-sensitive presence information and which has similar properties.
This "Representation of Uncertainty" I-D defines key concepts of
uncertainty and confidence as they pertain to ___location information are
defined. The draft also outlines methods for the manipulation of ___location
estimates that include uncertainty information. It provides guidance on
how to manage ___location information that includes uncertainty. Methods
for expanding or reducing uncertainty to obtain a required level of
confidence are described. Methods for determining the probability that
a Target is within a specified region based on their ___location estimate
are described. These methods are simplified by making certain assumptions
about the ___location estimate and are designed to be applicable to
___location estimates in a relatively small area. Background: "Location
information represents an estimation of the position of a Target. Under
ideal circumstances, a ___location estimate precisely reflects the actual
___location of the Target. In reality, there are many factors that
introduce errors into the measurements that are used to determine
___location estimates. The process by which measurements are combined to
generate a ___location estimate is outside of the scope of work within
the IETF. However, the results of such a process are carried in IETF
data formats and protocols. This document outlines how uncertainty,
and its associated datum, confidence, are expressed and interpreted..."

http://xml.coverpages.org/draft-thomson-geopriv-uncertainty-02.txt
See also Geolocation Policy:
http://xml.coverpages.org/draft-ietf-geopriv-policy-17.txt

-- 
Pavel Smrz
Associate professor
Faculty of Information Technology
Brno University of Technology
Bozetechova 2, 61266 Brno
Czech Republic
Phone: +420 541 141 282
Fax: +420 541 141 290
http://www.fit.vutbr.cz/~smrz

Received on Tuesday, 9 December 2008 09:26:47 UTC