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Gravity/Elevation/Altitude Correction

Former Member over 15 years ago

I'm still uploading to MotionBased because the elevation profiles in GC re terrible. I nearly always start and end my rides at the same location (my house) and to find that it rose or sank by 50m while out for a 1hour ride is disconcerting to say the least. What's more in some cases I've even used a digital barometer to confirm that the atmospheric pressure did not change during the ride. So either the barometer in my Edge 305 is not working correctly (no temperature correction?) or Connect is not getting the data our correctly.

Whatever the cause it's not great to see that my data is inaccurate on a site that is supposed to replace MB where the data is accurate and reliable,

0 seilogramp over 15 years ago

I would have thought the the Edge would be fairly accurate. Not sure why GC would be making "corrections." Is your data in Training Center more accurate? How does that compare to what you see on the Edge?

0 Former Member over 15 years ago

I have the same problem, even on short runs.
MB had a way of correcting this - hopefully GC will add that as a feature at some point.

0 Former Member over 15 years ago

Sorry for my English,
I'm supporting the question to add the MB gravity agent correction on GC.
Thx
Carl

0 seilogramp over 15 years ago

I'm supporting the question to add the MB gravity agent correction on GC.

Lots of us here, especially Forerunner owners, are going to miss MB gravity. It is not clear to me whether GC will use an algorithm to correct elevation or something similar to MB gravity where your data is corrected via a known database of elevation points.

0 ABABNZ over 15 years ago

Improved altitude accuracy by using Google maps data

It is quite noticeable how inaccurate the altitude data is when you view the track overlay on Google Maps in Terrain mode. Which got me thinking, could you not post-process the track information on the Google Connect server, updating/correcting the altitude data by looking up the appropriate lat/long on the Google Maps terrain? This would surely lead to a much more accurate result.

Perhaps this could be an option that users could choose to turn on or off.

Thanks
Andrew

0 Former Member over 15 years ago

I also want this feature

0 JASLA over 15 years ago

me too

0 Former Member over 15 years ago

yes, of course i would like to have it.

michi

0 Former Member over 15 years ago

Yes, please.

I just ran on a school track and elevation changed by 100 feet and it wasn't consistent. First off, I can't believe a 400 meter track rises or falls 100 feet, and secondly the inconsistency was strange. Really weird seeing how my lat/lon were practically perfect.

0 Former Member over 15 years ago

Reason barometer is not very accurate.

The barometer in the Edge305 is only accurate if the atmospheric pressure is constant. Since the weather is always changing the altitude measured at a fixed position will change and get lower when there is high pressure and higher when there is low pressure. This is how mountaineers can know that good or bad weather is moving in. This was supposed to be the beauty of GPS that it was not subject to the same errors as barometric pressure and changes in sea level for nautical navigation.