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A comment on Gear Review: Wahoo Elemnt Bolt. Parent comment

Re:Gear Review: Wahoo Elemnt Bolt by alexlrobertson on Sunday August 05, 2018 @11:50PM (#17694992)
Altitude is a tricky thing with these kinds of devices. They’re usually based on pressure readings from a sensor inside the device but that reading can be affected greatly by a number of factors.

See https://groups.google.com/forum/m/#!topic/wahoo-elemnt-users...

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Re:Gear Review: Wahoo Elemnt Bolt by ebikelaw on Monday August 06, 2018 @12:42AM (#17695135)
With all the people riding around with these sensors now, shouldn't it be possible to synthesize a very accurate basemap elevation from the reported barometric and GPS readings?
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Re:Gear Review: Wahoo Elemnt Bolt by 07d046 on Monday August 06, 2018 @01:35AM (#17695284)
Strava does this
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Re:Gear Review: Wahoo Elemnt Bolt by alexlrobertson on Monday August 06, 2018 @10:44AM (#17697994)
Got a source?

Strava segments in my area often have very wrong altitude data. Chicago is extremely flat yet there are segments that report gradients of over 10%, sometimes as much as 27%. I believe they are thrown off by buildings and the frequent elevated train tracks.

https://www.strava.com/segments/1504604

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Re:Gear Review: Wahoo Elemnt Bolt by 07d046 on Monday August 06, 2018 @09:10PM (#17703152)
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.

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