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Course Elevation Plot data from GPX or from Map?

I ran a course I uploaded yesterday and all the elevation data seemed accurate however when I look at the elevation plot, it is way off. Viewing the course plot on the watch during the activity it shows a starting elevation of 7301' and max elevation of 9285'. However it shows an ascent of 8408'! The true ascent was 2133'. The climbpro vert was also way off. I assume the GPX data is bad.

What would be the easiest way to calibrate the correct ascent numbers in the course? I can't find a way to view the actual GPX ascent data points outside of the watch. Also, I assume that the ascent and climbpro data can only be ran from the initial GPX data and not the actual map from the watch?

0 phoglund_ over 6 years ago

Do you have the gpx-file your self?

You can open it in a text editor to see if there are any <ele> in there at all.

Open http://www.mygpsfiles.com/app/ and drag your file into it and then you can see a graph of the elevation. It also shows (what I assume are calculated) E+/E-. To my knowledge, gpx can't contain ascent/descent values. My test file that I just used, didn't contain it and it shows E+ and E-..

0 bjolls over 6 years ago in reply to phoglund_

Interesting. I uploaded the GPX to the site and it shows the correct E+/E- data and searched the text but nothing looks out of ordinary. Now I'm really confused. Here is the Elevation plot:

0 phoglund_ over 6 years ago in reply to bjolls

I see a lot of mini spikes in the watch graph. Can it be that the watch adds all those? Maybe MyGpsFiles smooth it before calculation. Can you see those mini-spikes in the text file?

0 bjolls over 6 years ago in reply to phoglund_

Yeah, odd but the data isn't showing that variation on the text file. I've put in a ticket with Garmin to see if they can figure out why it's so off.

0 DanielM over 5 years ago in reply to bjolls

this only happens to my if i import a course via garmin connect. the elevation data is ridiculous. if i import the same course via the komoot connect iq app, the original elevation data that also feeds into climbpro is correct. that's why i am using this workaround. something with gamins algorithm is broken?! i am also seeing these spikes.

i also started a discussion - including pictures here:

https://www.dcrainmaker.com/2020/05/garmin-launches-strava-komoot-route-sync-works-on-devices-a-decade-old.html#comment-3562253

0 bjolls over 5 years ago in reply to DanielM

Thanks DanielM! I’ll try Komoot. I never heard back from Garmin support and gave up but, the issue is still there.

0 radamat82 over 5 years ago

I often have the same problem. Try to upload the GPX file with GarminBaseCamp instead GarminConnect

0 RunR over 5 years ago

I see only small differences. Typical example is:

I draw a cycling track with the app Locus Maps (Android), than export as GPX-file and import into the GC Mobile App: 445 meters. On the watch the elevation plot says 364m. There is no difference whether the drawn GPX-file includes elevation information or not. So both Garmin Connect and the watch calculate the elevation. In most cases the difference is only a few meters.

I ran a speed-hiking trail last year and the GPX-track was provided. It shows 1080m on the watch, 1126m in Garmin Connect and after the run the measured elevation was 977m.

So overall I only see values which are in a normal range of error and I never saw something like factor 4....