Are there any metrics out there as to the relationship between density of towers and location accuracy? How dense is "high density"?
Kevin -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Michael Weisman Sent: Wednesday, January 16, 2008 4:23 PM To: [email protected] Subject: Re: [Geowanking] liveblog: iphone location platform withgoogle/skyhook It seems that accuracy is vastly improved with a higher density of cell towers (at least for the symbian cell only version). In Vancouver it's usually too far off to be useful, but in New York, it was actually accurate enough for me to use for basic navigation. On 16-Jan-08, at 12:16 PM, Andrew Turner wrote: > I haven't tried the iPhone version - but the N95 version is similar > (which I found rather good) with just Cell positioning. I imagine > there may be some limits on whether multiple cell towers can be seen > with strengths. Worst case it would put you *at* the location of the > cell tower you are connected to. > > Would be interested to know what type of filtering algorithms they're > using to get an estimate from so many 'sensor' measurements of varying > accuracy. > > One major problem with the N95 GoogleMaps app is that it locks up if > you lose data connection. Anyone else experienced this on the iPhone > or N95? > > > On Jan 16, 2008 3:11 PM, S Wotherspoon <[EMAIL PROTECTED]> wrote: >> I'm curious to know how the celltower/wifi triangulation is working >> for >> others. If you've installed v1.1.3 and have tried geopositioning >> yourself >> please share your results. Here's the info from my last three >> attempts: >> >> Actual Location: 8th and Oak Sts., Oakland, CA >> Nature of Urban Area: Low rise residential, edge of downtown >> WiFi Connected? N >> Edge Only? Y >> ATT Bar Strength? 5 >> Circle Radius: 1.75 miles >> Crosshairs aligned with actual location? N >> Crosshairs how far off? 0.26 miles >> >> Actual Location: 8th and Oak Sts., Oakland, CA >> Nature of Urban Area: Low rise residential, edge of downtown >> WiFi Connected? N >> Edge Only? Y >> ATT Bar Strength? 5 >> Circle Radius: 0.18 miles >> Crosshairs aligned with actual location? N >> Crosshairs how far off? 0.05 miles >> >> Actual Location: Durant Ave and International Blvd., Oakland, CA >> Nature of Urban Area: Single family home residential, suburban >> WiFi Connected? Y >> Edge Only? N >> ATT Bar Strength? 5 >> Circle Radius: 1.49 miles >> Crosshairs aligned with actual location? N >> Crosshairs how far off? .18 miles >> >> I also had three failed attempts to geolocate at locations 1 and 2. >> The time >> to locate is probably around 4-14 seconds. I haven't tried while >> driving! >> >> Thanks, >> >> Stella >> >> >> >> On Jan 15, 2008 10:44 AM, Mike Liebhold <[EMAIL PROTECTED]> wrote: >>> liveblogged steve jobs keynote at macworld: >>> >> http://www.engadget.com/2008/01/15/live-from-macworld-2008-steve-jobs-ke ynote/ >>> >>> >>> 9:24am ""First: maps with location ... You know have the ability >>> to find >>> your current location in maps. >>> >>> 9:26am - Maps demo now -- page curls up, search and directions >>> buttons >>> now -- if you've seen the 1.1.3 demo vids, this is exactly it. >>> "Schoom. >>> And there we are." as it locates Steve in the Moscone. "I can flip >>> right >>> into directions, and it uses my current location to start..." >>> calcing >>> the route back to Apple HQ. >>> >>> 9:28am - "We love working with Google. >>> >>> 9:31am - " Well, we're working with two companies. Google, and >>> Skyhook >>> wireless -- we've driven the US and Canada and mapped WiFi hotspots, >>> they have 23m hotspots in their database." >>> >>> 9:33am - "They pick up beacons, triangulate the beacons, and tell >>> you >>> where you are -- and Google is doing the same thing triangulating >>> cell >>> towers -- we're using both of them, and it works pretty doggone >>> well. We >>> have this new add to home screen button... add our apps right to the >>> home screen." >>> _______________________________________________ >>> Geowanking mailing list >>> [email protected] >>> http://lists.burri.to/mailman/listinfo/geowanking >>> >> >> >> >> -- >> Stella Wotherspoon >> mobile 415-637-7799 >> _______________________________________________ >> Geowanking mailing list >> [email protected] >> http://lists.burri.to/mailman/listinfo/geowanking >> > > > > -- > Andrew Turner > [EMAIL PROTECTED] 42.2774N x 83.7611W > http://highearthorbit.com Ann Arbor, Michigan, USA > Introduction to Neogeography - http://oreilly.com/catalog/neogeography > _______________________________________________ > Geowanking mailing list > [email protected] > http://lists.burri.to/mailman/listinfo/geowanking _______________________________________________ Geowanking mailing list [email protected] http://lists.burri.to/mailman/listinfo/geowanking _______________________________________________ Geowanking mailing list [email protected] http://lists.burri.to/mailman/listinfo/geowanking
