David SmithNov 14, 2023

Working on using a Kalman filter to improve my distance calculations during GPS tracked workouts. Two observations:

A) I've never felt more like the “I have no idea what I'm doing" dog meme. Math can be very difficult.

B) Having spent all day looking at GPS traces from various devices, it is striking just how good the dual band receiver in an Apple Watch Ultra is compared to older iPhones. My processing has almost affect on most Ultra traces, but can massively improve iPhone traces.

Show threadBenjamin HerrinNov 14, 2023
@_Davidsmith if you want some data I’m happy to share some of mine with my iPhone 15 and Ultra (1st gen) I’m in Orlando the next few days for a conference then going camping and hiking over the weekend.
Show threadDavid SmithNov 14, 2023
@benjaminherrin Thanks! but the nice thing about the way Health stores past workout routes is that I actually have a massive compendium of testing data which I've bee inadvertently collecting for years. Which I think provides me enough data to work from.
Show threadBenjamin Herrin
@_Davidsmith oh that’s fascinating! Super cool that you can dive back into that data!
Nov 14, 2023 at 5:54pmIvory for iOS