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Strava - import from ridewithgps added 800 feet

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Strava - import from ridewithgps added 800 feet

Old 07-05-19, 06:45 PM
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billyymc
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Strava - import from ridewithgps added 800 feet

So I dont' really use Strava but a few of my riding buddies do. Today four of us attempted a ride that only one of us (not me) managed to finish. We were taking on a century with about 10,300 feet of climbing...and the last 10 miles were flat so all that was in the first 90. The humidity was high when we started at 6:30, and once the cloud cover burned off it was brutally hot (for upstate NY) - about 92 degrees. I managed 81 miles and - according to ridewithgps which I was using, about 8,500 feet. I got dehydrated and my core temps were soaring on the last few climbs - was dousing with ice water to get through them but had to quit with three sizeable (and fully exposed) climbs left.

Basically all four of us rode four differnet rides - so I tried to share mine on Strava by exporting from ridewithgps (export history), and importing the TCX file to Strava. The distance came out right but Strava added 800 feet to my climbing. FWIW, my bike computer with an altimeter showed about 8,800...still not the 9,300 Strava made up.

Any way to fix this so the elevation gain shows what ridewithgps had?
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Old 07-05-19, 07:56 PM
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Where it shows your ascent on Strava, right below it says "Elevation (?)" and you can click that to have the elevation corrected. No telling whether it will go up or down.

Can't really assume RWGPS is correct, if there was a big swing in barometric pressure over the course of the ride. I've had my Garmin short me as much as 25% over the course of a ride.

I've found Strava's corrected ascent numbers to be quite accurate, judged by comparing them to known elevation points.
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Old 07-06-19, 08:15 AM
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Originally Posted by billyymc View Post
So I dont' really use Strava but a few of my riding buddies do. Today four of us attempted a ride that only one of us (not me) managed to finish. We were taking on a century with about 10,300 feet of climbing...and the last 10 miles were flat so all that was in the first 90. The humidity was high when we started at 6:30, and once the cloud cover burned off it was brutally hot (for upstate NY) - about 92 degrees. I managed 81 miles and - according to ridewithgps which I was using, about 8,500 feet. I got dehydrated and my core temps were soaring on the last few climbs - was dousing with ice water to get through them but had to quit with three sizeable (and fully exposed) climbs left.

Basically all four of us rode four differnet rides - so I tried to share mine on Strava by exporting from ridewithgps (export history), and importing the TCX file to Strava. The distance came out right but Strava added 800 feet to my climbing. FWIW, my bike computer with an altimeter showed about 8,800...still not the 9,300 Strava made up.

Any way to fix this so the elevation gain shows what ridewithgps had?
FWIW.. I didn't really get a satisfactory answer to a similar storied scenario.

https://www.bikeforums.net/19928055-post26.html
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Old 07-06-19, 10:32 AM
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There really is no “correct” measure of cumulative vertical ascent. It’s the same problem as “how long is a coastline”. It depends on the length of your ruler.

With that caveat in mind, this page lets you adjust the recorded elevation values of a GPX file to map topography:

Find "Missing" Elevations with GPS Visualizer

Last edited by terrymorse; 07-06-19 at 11:00 AM.
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Old 07-06-19, 08:02 PM
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So today ridewithgps must have recalculated the elevation and is showing 9,471 feet - so about 100 more than the Strava total, and about 900 more than it showed yesterday right after I ended the ride. Weird.
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Old 07-07-19, 08:21 AM
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My Lezyne GPS and strada never agree on climb.

The longer the route, the closer they are, but still don't match.
30mi short rides will be off 50-75% sometimes.

Oh well- I know if a route is hilly or not.
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