GPS-Sport ForenRun.GPS Wishlist / IdeasDOP threshold
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Tom 04.08.2008 16:23:04 UTC



The default settings are
45 sec for speed smoothing and
60 sec for altitude smoothing (altitude does not change that fast unless you're in a jet airplane)
and these are also the recommended settings for running and cycling.


Bosti 04.08.2008 14:40:55 UTC



What is the best "Smoothing" as you recommend? Now I have: Speed buffer: 9s and altitude buffer:8s.

Thanks
Tom 04.08.2008 09:14:11 UTC



The altitude smoothing buffer already acts as a (low-pass) filter which filters out any fast changes in altitude. If we'd add an additional filter that might be a problem in the following case: if GPS first detects wrong altitude and needs to adapt quickly to the correct altitude. If we were to add an additional filter this process might take too long (minutes).

Bosti 03.08.2008 23:34:38 UTC geändert am 03.08.2008 23:37:20 UTC



I have te same problem; with bike in the tunnel, for example. Near tunnel of highway.. http://www.gps-sport.net/trainings/Vitanje-Slovenske-Konjice-Ponikva_35350 - position is quite good, altitude is bad.

What about this solution: add a limit how much can altitude and position change in 10 seconds... and filter it.

[1]
Tom 17.07.2008 18:34:39 UTC



We've been experimenting quite a lot with filtering based upon DOP and it came out that DOP is not so reliable too in such a situation as you described - the DOP can be very good yet the actual position is far distant.

Maybe we'll allow to set a minimum DOP in the GPS settings in the future.
jabol20 17.07.2008 14:09:25 UTC



Running through city sometimes i have to run in tunnel to cross street. Effect of this is, that GPS (Eten Glofiish M700) loses fix. This would be OK, but when fix is restored incorrect points are logged.
You can se example on http://www.gps-sport.net/trainings/pkin-imielin_31588 near text "Dolina Sluzewiecka" (on 5/6th of track)

My idea is to log DOP of GPS aside position, so after training it would be possible to set DOP threshold and upload track with best DOP or upload all points (so decision about track quality will lie on user side)
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