Le 25/03/2014 14:05, Adrian Custer a écrit : > > Already, I have started wondering about problems in the data gathering > of the Wifi base station locations. (I suspect, but have not yet > confirmed, that the hardware and code behind the > navigator.mozWifiManager API call are storing signals based on the > periodic broadcast from wifi base stations but only dropping the base > station after some timeout. I am seeing residence times of base > stations in the data reported by the above API of around a full > minute, a time within which I have moved far out of radio contact with > the base station, far enough away that relating the later positions to > the wifi base station makes for a crummy position estimate (~300meters > of that error term alone).
300 meters is not bad already ;) > Confirming this and figuring out how to handle it will require a bunch > of field work, something I am not yet sure how to do.) A solution > might eventually be to eliminate the presence of a wifi for all > positions beyond a certain distance (or time) from initial observation > (or at a position or time based on some calculation involving initial > observation and the evolution of signal strength), something which > could even be done on the server eventually for already accumulated data. I'm not an expert at all, and I don't know the app either, but I think we know the signal strength, right? Maybe the app is recording this as well, and we're removing the station with too weak signal?
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