Source of ride elevation data

[alanwalker]

Hi,


What is the source of the point elevations which become embedded in exported TCX files? If I import into Garmin connect, sometimes there is almost a 3x elevation gain difference between the raw data and letting Garmin Connect correct it using maps. I'm thinking the only valid data you should use would be uncorrected raw numbers because that is what your software uses to determine grades. Does that sound right?


Please help.



Thanks!



I didn't find the right solution from the Internet.



References

veloreality.com/forum/viewtopic.php?f=8&t=73



Software Explainer Video