[Geowanking] Background Location on iPhone

[Andy Turner]

Hi John, geowanking, (cc Chris)

At an event called Dev8D earlier this year a group was working on locating within a building or venue based on using wifi signal strength to triangulate position. You can find a clue as to who is involved on the following web page:
http://wiki.2010.dev8d.org/w/Happy_Stories
At the time I wasn't convinced stupidly thinking that there was only one signal strength at any location, but now I've realised that the triangulation is by overlapping signals from different connection points. I copied in Chris who was excited by the idea at the time, he may want to chime in...

Good luck and best wishes,

Andy
http://www.geog.leeds.ac.uk/people/a.turner/
 

-----Original Message-----
From: geowanking-bounces at geowanking.org [mailto:geowanking-bounces at geowanking.org] On Behalf Of John McKerrell
Sent: 09 April 2010 08:34
To: geowanking at geowanking.org
Subject: [Geowanking] Background Location on iPhone

A blog post I wrote on Saturday has been made obsolete by Apple's announcements yesterday. A lot of what I said in the post is still valid though, you can find the post here:

http://blog.johnmckerrell.com/2010/04/03/coming-soon-in-iphone-os-4-0/

In the event they suggested that social networks would use cell positioning whereas a GPS/Sat Nav running in the background could use the full GPS. I'm guessing that this is actually just up to the developer, though might be partly enforced by the reviewers. I don't really see place based background check-ins working too well from cell-based locating, especially if you're inside a building. Wi-fi might work better assuming it's possible to use that. In my blog post I've mentioned using various methods to determine the best frequency to detect a location.

Any thoughts?

John
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