As they say, [citation needed]. See
http://www.doylesdartden.com/gis/gpstest.htm http://gisandscience.com/2009/07/15/accuracy-of-iphone-locations-a-comparison-of-assisted-gps-wifi-and-cellular-positioning/ http://farmindustrynews.com/farm-equipment/precision-farming/farming_on_target/ http://www.ehow.com/facts_5030374_accurate-gps-system.html http://www.gpsworld.com/gnss-system/expert-advice-does-anybody-really-know-what-accuracy-is-4190 for different perspectives. [The second one only mentions the median in the abstract, so it's theoretically possible that you could have trouble with 95% within 100m, but it seems unlikely.] Henning On Mar 9, 2010, at 5:52 PM, Brian Rosen wrote: > I will fix the nits as you suggest. > > We have quite a bit of experience in the U.S. with what kind of GPS accuracy > we can get. There are millions of phones and tens of thousands of calls > annually using GPS positioning. It is quite difficult to achieve a 100 > meter accuracy 95% of the time. Technology is improving all the time, but > at the moment, carriers are struggling to achieve the regulatory mandate for > 100 meter uncertainty, 95% confidence. > > WGS84 is the most commonly used international datum. IETF emergency calling > is based on IETF geopriv standards (see RFC4119), which specifies WGS-84. > > Brian > > > On 3/8/10 10:44 AM, "Francis Dupont" <[email protected]> wrote: > >> I have been selected as the General Area Review Team (Gen-ART) >> reviewer for this draft (for background on Gen-ART, please see >> http://www.alvestrand.no/ietf/gen/art/gen-art-FAQ.html). >> >> Please resolve these comments along with any other Last Call comments >> you may receive. >> >> Document: draft-ietf-ecrit-framework-10.txt >> Reviewer: Francis Dupont >> Review Date: 2010-03-05 >> IETF LC End Date: 2010-03-10 >> IESG Telechat date: unknown >> >> Summary: Almost Ready >> >> Major issues: None >> >> Minor issues: the Terminology is incomplete (no PSAP for instance) >> and the GPS stuff seems a bit USA centric (IMHO you should show >> the document to a GPS (or Galileo :-) expert). >> >> Nits/editorial comments: >> - ToC page 2: Acknowledgements -> Acknowledgments >> >> - 1 page 3: add USA to National (if the NENA is a USA organization :-) >> >> - 1 page 3: I'd *really* like to get an entry for PSAP here! >> >> - 1 page 3: IMHO there should be an entry for LoST too. >> >> - 1 page 4: RoutinglLocation -> Routing Location >> >> - 2 page 5: e.g. -> e.g., >> >> - 2 page 5: expand EV-DO? >> >> - 3 page 10: AliceE -> Alice >> >> - 3 page 10: missing [M7] and [M8] >> >> - 3 page 10: floating "Figure 2" without a figure (from the .txt version) >> >> - 3 page 10 (in ESRP entry): sip -> SIP >> >> - 3 page 10: e.g. -> e.g., >> >> - 6 page 15: I don't know the quality of GPS in mobile phone, I have >> a GPS receiver for pedestrian (surely best conditions: open-sky, >> low speed), its accuracy is between 4 and 15 m (displayed) and >> <10m at 95% (vendor specs in peace time) without WAAS (I use it >> in France) so your numbers are a bit conservative. >> >> - 6.1 page 16: WGS 84 could (should :-) be replaced by another >> system and as far as I know it is not the system used in Europe >> (I don't know for ASIA). >> >> - 6.2 page 17: e.g. -> e.g., >> >> - 6.5 page 20: requestor -> requester? >> >> - 6.8 page 23: UAC -> UA (typo? if not the abbrev should be expanded) >> >> - 6.10 page 25: United States -> United States of America >> (yes, there are more than one United States :-) >> >> - 7 page 26: IMHO you should add a reference for LoST >> >> - 8 page 27: AP -> access point >> >> - 9.1 page 28: xref problem (missing '<' in XML?) >> >> - 9.1 page 28: IPSEC -> IPsec >> >> - 10 page 30: please define AoR abbrev at its first use. >> >> - 12 page 30: i.e -> i.e., >> >> - 15 page 31: some missing text before "includes a description" >> >> - 18 page 32: Acknowledgements -> Acknowledgments >> >> - Authors' Addresses pages 36 and 37: US -> USA >> >> Regards >> >> [email protected] >> >> PS: you have some comments from Cullen Jennings too. > > > _______________________________________________ Gen-art mailing list [email protected] https://www.ietf.org/mailman/listinfo/gen-art
