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Jun 2012
12:34pm, 19 Jun 2012
6,203 posts
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McGoohan
The what with the when with the who now?
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Jun 2012
12:49pm, 19 Jun 2012
572 posts
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ThorntonRunner
I may be talking rubbish here (I usually am), but there is an tolerance on the data recorded due to the accuracy of the time signal snet from each satellite. Hence when you lock on, Garmin will say it's accurate to within 20m or whatever. So the raw data is not itself exact. Do different pieces of software use different algorithms for smoothing the data between successive points (some may just use the raw data, others may try to smooth out these up to 20m inaccuracies). This would allow different software to give different results.
The one thing that isn't up for grabs is the time though - can't see any reason why the interpretatino of the raw data would change that
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Jun 2012
12:49pm, 19 Jun 2012
60,816 posts
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GregP
Fetch - read the header - that is the general thrust of it, but Spouter is spot on - we can't understand why strava seems to be almost wilfully 'inaccurate'.
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Jun 2012
12:51pm, 19 Jun 2012
60,817 posts
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GregP
ThoRu - sort of with you - but your last sentence, with which I concur, pulls everything else into doubt, surely?
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Jun 2012
12:56pm, 19 Jun 2012
9,054 posts
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Argie
Is this a thread to circumvent the usual feedback route and actually get Lord Fetch to answer feedback for another website? If it is then that is a most excellent idea.
I wonder if the lazy imp could explain why itunes is such a fucking nightmare.
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Jun 2012
12:59pm, 19 Jun 2012
60,819 posts
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GregP
Imp? Improvement on pixie, I s'pose.
No Arge - strava seems to be something of a (cycling) phenomenon at the moment, and I joined in the fun, then noticed I was getting odd data.
Fetch, Garmin Connect and TrainingPeaks seem to take one view of the world. strava takes a different one. Nobody has managed to explain why.
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Jun 2012
12:59pm, 19 Jun 2012
11,289 posts
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fetcheveryone
Fetch uses the lat/long pairs recorded by the GPS device, and calculates the distance between each one using maths. I can't speak for the others.
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Jun 2012
1:00pm, 19 Jun 2012
9,057 posts
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Argie
Perhaps strava is shit. (which is my explanation by the way). 
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Jun 2012
1:00pm, 19 Jun 2012
9,058 posts
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Argie
"Maths" - WTAF
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Jun 2012
1:01pm, 19 Jun 2012
60,821 posts
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GregP
Thanks Fetch - that's helpful. And presumably that maths is unambiguous?
Arge - this seems to be the emerging concesus, yes.
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