Hello Richard,<br>thank you very much again for your replies !<br><br><blockquote style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;" class="gmail_quote">
> - Richard Atterer here : <a href="http://atterer.net/leadme" target="_blank">http://atterer.net/leadme</a> ;<br><br>
I just extended that page with pictures of the hardware I built for indoor<br>
mapping, and a screenshot of the map editor I'm developing.<br></blockquote>
<br>Richard ! Your mapping mouse (a walkable path recorder :-) ) looks amazing and funny to use ! So you've taken two quake-gaming mice and consider using a proximity probe, a compass and HD webcam... (I used my german-english dictionaries & some old skills :-) )<br>
<br>I've pasted a link for your project on the Indoor mapping osm wiki page in the Projects > Around OpenStreetMap section <a href="http://wiki.openstreetmap.org/wiki/Indoor_mapping#Around_OpenStreetMap">http://wiki.openstreetmap.org/wiki/Indoor_mapping#Around_OpenStreetMap</a><br>
<br>Jonathan-David Schröder<br><br><div class="gmail_quote">On Wed, Dec 16, 2009 at 10:39 PM, Richard Atterer <span dir="ltr"><<a href="mailto:richard@2009.atterer.net" target="_blank">richard@2009.atterer.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hello,<br>
<br>
thanks for CCing me, Jonathan-David! It's great to see other people are<br>
interested in indoor navigation! I just subscribed to the dev list.<br>
<div><br>
On Wed, Dec 16, 2009 at 10:50:01AM +0100, Jonathan-David SCHRODER wrote:<br>
> Outside of openstreetmap's site, we have found several people mentioning the<br>
> topic of indoor geopositioning :<br>
> - Richard Atterer here : <a href="http://atterer.net/leadme" target="_blank">http://atterer.net/leadme</a> ;<br>
<br>
</div>I just extended that page with pictures of the hardware I built for indoor<br>
mapping, and a screenshot of the map editor I'm developing.<br>
<br>
(I should mention right now that my time to continue working on this is<br>
very constrained in the nearer future. :~-| )<br>
<div><br>
> - on mobile phones : use of Nutiteq's j2me maps library, or other<br>
> android piece of open source software for example (osmdroid, opensatnav).<br>
> Some code around those apps allows for more zoom levels & for<br>
> threaded-background gathering of wifi beacons positions (stored in 2)'s<br>
> database) so as to make triangulation calculation and to allow end-user<br>
> searching of objects to display on top of map (what do you propose for this<br>
> overlaying ? Can the Web API reply to the queries with a KML group of<br>
> features ?... we want to have features's URLs known and usable on the mobile<br>
> end).<br>
<br>
</div>From what I gathered (from researchers working in this area), triangulation<br>
in an indoor setting is problematic. Signals may be attenuated due to<br>
walls, or may be reflected from walls, so it just does not work well.<br>
<br>
To get around this issue, my simple idea was to continuously record WiFi<br>
beacons and their relative strength, and include many many samples in the<br>
map - with every node, and possibly even in extra nodes created just to<br>
carry that information. With a decent algorithm, this might give better<br>
results than storing AP location info in the map.<br>
<br>
Cheers,<br>
<br>
Richard<br>
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--<br>
__ ,</font> </blockquote><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><font color="#888888"> | ) /| Richard Atterer<br>
| \/ | <a href="http://atterer.net" target="_blank">http://atterer.net</a><br>
<br>
</font></blockquote></div><br>