How works the barometer (air pressure sensor)?

[jusc]

I calibrated the barometer at start point to the known gps altitude (70m). After recording a round track in "Offline Mode" I wondered, that all points seem to have nearly the same "barometer" altitude (nearly 75m). On my trip I used a second phone without air sensor, but in "Online Mode". The recorded track seems to have correct or  at least better altitude values, because the in this case the gradients between 70 and 130m were considered.

[jusc]

@Menion,

can you please give me an update?  :mrgreen:
As I wrote before, in "Offline mode" the measured air pressure altiude seems to be nearly the same all over the recorded track.
How often does Locus take the air pressure, at every recorded track point?

[Menion]

sorry ... I had open this topic in firefox, but ...

anyway, pressure sensor in device get pressure values once per second I think. Locus anyway grab all these values and use last achieved when storing new point.

What method you used? It's true that I wasn't using this method (with pressure sensor) for some time, so I'll gladly check it preciselly

[tommi]

Menion, could you also check what the problem is if there are more than few meters difference between highest and lowest point of a trip/track?
I already reported a problem in late summer with a mountain trip from ca. 850m to ca. 1900m but the track showed only 850m to about 1850m and back to 850m (so I can't explain it with the weather).
I had another example later in autum from 0m to about 1900m and again the value was far away from being correct. If you are interested I can grab some screenshots I made.

[jusc]

sorry ... I had open this topic in firefox, but ...

anyway, pressure sensor in device get pressure values once per second I think. Locus anyway grab all these values and use last achieved when storing new point.

What method you used? It's true that I wasn't using this method (with pressure sensor) for some time, so I'll gladly check it preciselly

I calibrated in Locus the known altitude over N.N. (recording 3 sec. and 5 meters) What I see is: While hiking uphill there are about 50! points at the same altitude and then suddenly the next point is 30 meters higher than the point before. I controlled it in between with another app, that seems to be correct: https://play.google.com/store/apps/deta ... ltZXRlciJd
I stopped for controlling and after closing this app (30 seconds later) suddenly the altitude of Locus jumps 30 meters up, too. Strange..