Q: calculation of ascent

[Wolfgang Berberich]

Hi Erik,

the ascent value may be affected by three things:

a) It comes from your GPS device, for example from a lap recording. 

b) I calculate it on my own, using a high-pass filter as minor variations of inaccuracies of your GPS may otherwise sum up to huge errors.

c) I calculate them with a different threshold in the low pass filter. You can switch between the lower and the higher values in Application Preferences > Advanced.

The Problem with the ascent value is that it is a nice theoretical number but practically it is almost senseless when your GPS altimeter is inaccurate

e.g.:

100

101

102

100

103

Will sum up as 5 meters in ascent where in reality it may be a straight climb from 100 to 103. Imagine what can happen over the course of 5 km.

The lower value in TrailRunner is 2 meters, the higher is 12 meaning that I assume anything that is less that 2 meters away from the last settled altitude point as the same height.

I know that I answered like nothing, but this is what makes this topic so philosophical.

BTW: I did no receive the screenshots, you may send then again and I'll take a look at these.

cheers,

- berbie.

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[Berbie]

Minor correction to the above:
Its a high pass filter in any case. And the cut-off threshold is
either 2 meters or 12 meters.

On Dec 5, 5:27 pm, Wolfgang Berberich <berbie.trailrun...@mac.com>
wrote: