The iPhone 6 and later have barometers, as do some android devices. Due to the challenges of interpolating low resolution elevation data and GPS elevation inaccuracy, elevation gain/loss and profiles are often inaccurate, both for routes and tracks. I would love to be able to record barometric elevation as I travel and contribute that data towards some sort of open dataset akin to Strava's (https://support.strava.com/hc/en-us/articles/115000024864-Announcing-Strava-s-Elevation-Basemap). I would expect this to be opt-in, as it likely would increase battery drain.
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