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All Maps Are Wrong
Maps are lies, GPS is inaccurate, elevation is hard, and your Strava track probably "wrong" and "right" at the same time
GPS data from the receiver is passed along to software (apps), and parsed in order to track your movement, recording information like speed, distance, and route. When you track a route with your phone or watch, your series of GPS waypoints are stored as vector lines, and given the degree of accuracy discussed above, the raw data is likely to look like a constant zig-zag. So when someone records a track using a watch with a barometer (highly accurate), Strava will associate those elevation values with the raw GPS data and the smoothed route in order to continue improving their calculations.
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