How accurate is elevation on Garmin GPS/Garmin Connect?

2»

Comments

  • meanredspider
    meanredspider Posts: 12,337
    The "corrected" version doesn't look too far off. The scale is very different which "flattens" the profile but you start at +/- 440m and finish at +/- 570m in both.

    Be better to compare them on the same scaled Y-axis
    ROAD < Scott Foil HMX Di2, Volagi Liscio Di2, Jamis Renegade Elite Di2, Cube Reaction Race > ROUGH
  • schweiz
    schweiz Posts: 1,644
    but look at the ascent/descent numbers...no way do I climb over 500m!!
    VN BMC Cube SS
    http://app.strava.com/athletes/30000
  • schweiz
    schweiz Posts: 1,644
    Here's a rescaled Garmin Connect with correction.

    el633b.jpg

    I'm not disputing that it looks right and that the start and finish altitudes are correct, it's the reported cumalative height gain/loss of +529 m/-388 m when the 'real' values average out around +200 m/-70 m.

    Anyone using corrected values could be doing far less climbing than they think. (Admittedly the sample size of one ride is hardly statistical proof!)

    And throughout the year, there's a lot less varition in the length of the ride (less than 0.5%) than in the amount climbed!

    (edit) I think I should add that that between about 14 and 22 km, the ride really is completely flat. The spikes in the corrected data in this region are causing the huge errors.
    VN BMC Cube SS
    http://app.strava.com/athletes/30000

Categories