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activityworkshop / GpsPrune

GpsPrune is a map-based application for viewing, editing and converting coordinate data from GPS systems.
GNU General Public License v2.0
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Speeds are not shown with exactly the same values reported by some other software #85

Open snooppr opened 1 year ago

snooppr commented 1 year ago

There is a track with a distance of 720 km and from 64K points.

From the menu point --> Go to --> fastest point. I move to the point with maximum speed. OK, speed is 50.8 km/h.

As soon as I upload the track to a sports social network, the social network reports that the maximum speed is 81.2 km/h.

I check this track in another software (GpxSee), gpxsee says that yes, the top speed is 81.2 km/h.

Justification/correct. Usually the maximum unrealistic speed should always be removed from the track (these are GPS spikes), but GpsPrune does not display all track points on the graph (apparently applies smoothing), it needs to be fixed so that GpsPrune can "menu point --> Go to --> fastest point" move really to the point itself with the maximum speed.

fffff

And here is the number of points (30) from the gpx track with a speed of over 51 km/h that GpsPrune does not see screen Detected points are filtered by speed over 51km/h in gpx track editor software.

activityworkshop commented 1 year ago

Firstly, some terminology - according to GpsPrune, a waypoint is a named point which appears in the panel on the left. Usually these don't have speeds. So your claim that "GpsPrune does not display all waypoints on the track" doesn't match your description of the problem. I think what you mean is that GpsPrune shows speeds differently from GpxSee.

If you have a description of how GpxSee calculates its speeds, then we can compare how that differs with what GpsPrune does, but I agree with you it's probably just a question of smoothing.

snooppr commented 1 year ago

Sorry for the terminology, this is a google translator problem (I mean the track point). Further, the problem is in GpsPrune, GpxSee was taken as an example, take another software, which is also indicated in the screenshot (software - gpx track editor), it also sees 30 track points at a speed above 51 km / h, gpxprune does not see them. Take for example the sports social network Sports Tracker or osmand, everyone will show the speed of over 51 km/h.