Filter applied to Activity.Info.ambientPressure.

¿Someone knows about filter applied to Activity.Info.ambientPressure? ¿It's FirFilter, IirFilter, or another filter not inside IQ SDK?

I'm working with ambientPressure and I can see some delay time between it and position (and I supose ambientPressure is also delayed with distance data). It's not a fixed time, maybe some between 10 and 20 seconds, but not the same all time.

If I know what filter is applied to ambientPressure, I could apply same filter to distance, and get both data synchronized.

Many thanks,

0 jim_m_58 over 3 years ago

They only filtering is done by the HW or FW. When it comes to distance, I'd guess that some may applied if GPS is being used.

Even if you did your own filtering, that would not alter what's recorded in a fit file by the FW.

0 jam_ranning over 3 years ago in reply to jim_m_58

Thanks for the answer. Yes, it seems that distance is also filtered so all data are delayed about 20 to 30 seconds to "live activity".

It's not easy to see in distance, but very easy to see in pressure, taking a time point in the map where, for example, starts and uphill and comparing the time with fit file, where the uphill starts between 20 to 30 seconds later.

0 jim_m_58 over 3 years ago in reply to jam_ranning

Are you using 1 second or smart recording? Smart is the default.

0 5693709 over 3 years ago

if you want an unfiltered ambient pressure use rawAmbientPressure() instead, that's much faster responding than the regular ambientPressure(). I know what you're talking about with the lag in ambientPressure() values, but in my experience they're not 20-30 seconds, more like 5-10, but I don't think the actual delay is important anyway. Use the raw values and you'll get much faster response if that's what you're after, at the expense of being a little more jittery than the filtered version.

0 jam_ranning over 3 years ago in reply to jim_m_58

Yes of course, 1 second. Activity is running so 1 second is the only option ;-)

0 jam_ranning over 3 years ago in reply to 5693709

Thanks, I've tried raw and it's jittery as you say.

But I need to get a pressure data that is synchronized with distance, and I don't know if raw is. I have to test with it.

Yes, the shifting is around 5-10 seconds most times, but sometimes it takes a little bit more. Same with speed data for example.