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OpenTracksApp / OpenTracks

OpenTracks is a sport tracking application that completely respects your privacy.
https://OpenTracksApp.com
Apache License 2.0
1.04k stars 188 forks source link

gain/loss values seems not be reliable #1999

Open ironspock opened 23 hours ago

ironspock commented 23 hours ago

recording multiple tracks with different elevation in "lower mountains" (max. elevation approx. 500 m) some examples (in most cases the track were basically going up and then down): gain / loss 1254 m / 1284m by max. elevation of approx. 480m (track starts at approx. 150m) 129 m / 132 m difference between lowest and highest elevation approx. 30m 1062 m/ 1062 m by max. Elevation of approx. 500m (track starts at approx. 300m; lowest point at approx. 200m) 1164 m / 1164 m by max. elevation of approx. 300 m (tracks starts at approx. 100m)

compared to "original" gain/loss values (e.g. from downloaded tracks) the recorded gain/loss values are approx. 3-4 times higher

checking device based on https://github.com/OpenTracksApp/OpenTracks/blob/main/README_TESTED_SENSORS.md#tested-barometric-sensor-smartphones all 4 tests passed

Technical information

dennisguse commented 23 hours ago

OpenTracks records each change that is +/- 3m. So your phone's barometer reported this as a change.

The barometer is often also affected by how the device carried (like in a pocket or backpack or even using the case). Difficult science :)