https://support.strava.com/hc/en-us/articles/115000024864-Announcing-Strava-s-Elevation-Basemap https://support.strava.com/hc/en-us/articles/115000024864-An...

https://support.strava.com/hc/en-us/articles/115000024864-Announcing-Strava-s-Elevation-Basemap https://support.strava.com/hc/en-us/articles/115000024864-An... I'm guessing segments just use the elevation data of the activity that they were created from, hence why they can be wildly wrong.