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irfan-arshad-arbisoft / mytracks

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Absurd Grade and Elevation results #1448

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
I'm running KitKat on Nexus 5, MyTracks version Feb. 1, 2014. 
On a recent easy neighborhood walk for an hour, I get:
Grade Min=-16%, Max=463%
Elevation Gain=968 ft.
These results are simply impossible. However, it probably related to the app 
Chart shows that I started at 0 elevation (in reality, at about 550 ft).

Nice app otherwise, if it were to calculate or graph correctly. The maps and 
replay functions are great.

Original issue reported on code.google.com by rwz...@gmail.com on 2 Feb 2014 at 6:03

GoogleCodeExporter commented 9 years ago 
This may be an Android issue, but there is a partial workaround for this: set 
the Location to GPS Only, i.e. Device only in Settings. 
That corrects the elevation issues, and one gets much better tracking if WiFi 
location services are turned Off.

Original comment by rwz...@gmail.com on 2 Feb 2014 at 8:36

GoogleCodeExporter commented 9 years ago 
A little more testing with only GPS tracking reveals that even with GPS-only 
tracking and good Elevation data, the calculated Grade figures are still 
obviously nonsense. 

A half mile walk where the Chart shows only reasonable data - a gain from 550 
ft. and then loss of about 200 ft. again while going home, with no visible gaps 
in the Chart, gives Grade Min=-19% and Max=19%.

Does anyone ever Test this stuff?  I mean free is free, but a -19% Grade is not 
remotely reasonable unless someone jumps off a cliff.

Original comment by rwz...@gmail.com on 2 Feb 2014 at 11:04

GoogleCodeExporter commented 9 years ago

Original comment by jshih@google.com on 31 Mar 2014 at 5:27