The GSM carriers have implemented the network-based e911/LBS technology. However, they are finding that they’re not able to launch any meaningful LBS apps using the EOTD method (e.g., ATT failed miserably when they launched friend finder app in 2002). So, they are seriously considering the AGPS solution.
Only Nextel’s iDEN phones offer open API to the GPS data. The CDMA phones from Sprint and Verizon do not offer open API. The developers have to go through a rigorous certification process. Yes, PlaceLab is using the JSR 179 API, but mostly for non-cell phone mobile devices like laptops or PDAs. Btw, PlaceLab and other Wi-Fi based positioning systems are featured in a new book, Local Positioning Systems: LBS Applications and Services (see http://indoorLBS.com) Regards, K Kolodziej http://indoorLBS.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Andrew Turner Sent: Wednesday, April 12, 2006 10:50 AM To: [email protected] Subject: Re: [Geowanking] Re: E911 // cellular trilateration accuracy On 4/12/06, Anthony Townsend <[EMAIL PROTECTED]> wrote: > It's the FCC not the FAA, and my understanding is that none of the US > carriers are using tower triangluation (EOTD or other variants) because of > the cost of network upgrades. Instead they are pushing to cost to you, the > consumer, in the form of A-GPS equipped handsets. > What is the status of offering the A-GPS information to 3-rd party developers? I've seen the JSR 179 Java interface, but I don't believe all phones with A-GPS support this. I think PlaceLab is using a similar interface, but again, not sure of how many phones that works on. Anyone else with experience interfacing the location information on equipped phones? Andrew > > [EMAIL PROTECTED] ([EMAIL PROTECTED]) wrote @ 4/10/06 9:35 AM: > > > I think this is a great question. I talked to a gentleman from South Africa > > last year at Where 2 who claimed to be a GSM expert. He said that GSM can > > locate you within something like 3 meters with no GPS support just using > > the towers, and that this was built into the GSM spec. He spoke of a case > > in South Africa where they located some sort of criminal using the GSM > > records. > > > > He said that CDMA on the other hand, cannot locate so precisely. > > > > So, to me, A-GPS was designed to make CDMA users locatable to the same > > degree as GSM. > > > > As an aside, does anyone know which type of cell phones are more lethal? > > > > Roger > > > > Original Message: > > ----------------- > > From: Ian | Urban Mapping [EMAIL PROTECTED] > > Date: Mon, 10 Apr 2006 01:42:23 -0400 > > To: [email protected] > > Subject: [Geowanking] E911 // cellular trilateration accuracy > > > > > > At the risk of asking (another) obvious question, I continue my naïve streak > > on this listservŠ > > > > > > > > I¹ve heard very different reports of how accurate cellphone tracking is‹the > > FAA mandates something like 50% of calls must be traceable to within a range > > of 30m but I¹ve heard some mobile pros say they¹ve heard of it getting as > > good as several feet. Obviously this varies depending on geography (urban, > > rural, topography), but does anybody have any idea how the US wireless > > carriers stack up? And how does this compare to phones with GPS? > > > > > > > > > > > > Ian White :: Urban Mapping LLC :: <mailto:[EMAIL PROTECTED]> > > [EMAIL PROTECTED] > > > > 120 West 45th Street 20th Floor :: New York NY 10036 > > > > Tel.212.242.8267 :: Fax.866.385.8266 :: www.urbanmapping.com > > > > > > > > > > > > -------------------------------------------------------------------- > > mail2web - Check your email from the web at > > http://mail2web.com/ . > > > > > > _______________________________________________ > > Geowanking mailing list > > [email protected] > > http://lists.burri.to/mailman/listinfo/geowanking > > _______________________________________________ > Geowanking mailing list > [email protected] > http://lists.burri.to/mailman/listinfo/geowanking > -- Andrew Turner [EMAIL PROTECTED] 42.4266N x 83.4931W http://highearthorbit.com Northville, Michigan, USA _______________________________________________ Geowanking mailing list [email protected] http://lists.burri.to/mailman/listinfo/geowanking _______________________________________________ Geowanking mailing list [email protected] http://lists.burri.to/mailman/listinfo/geowanking
