Originally Posted by
70sSanO
Basically it shows elevation gain and also shows the min and max elevation. Subtracting the min from max never gives the same elevation gain, it is always greater.
The difference between the lowest and highest absolute elevation is almost always going to be less than the elevation gain.
You could, for example, be up-and-down the same hill multiple times.
Originally Posted by
70sSanO
For instance if you ride on a flat stretch with 10 underpasses, or even overpasses, how are they recorded. I’ve never checked for these? Technically the elevation gain is zero for the overpass/underpass.
There are three ways to determine the elevation along your path: barometer, GPS, using a database (DEM).
Barometer is the best, GPS is inaccurate (and doesn't work inside/undercover), and DEM often doesn't include the elevation of bridges or tunnels and has some other issues as well.
Your iWatch should have a barometer.
https://slate.com/technology/2015/03...r-station.html
Originally Posted by
70sSanO
Thanks. Then I guess the min and max would show 50’ difference, assuming a zero elevation gain on the flats.
The difference between the lowest and highest elevation just uses two points. The elevation gain is looking at the elevation of every point.