Doubt about Suunto 9 Baro altimeter/barometer calibration
-
@TELE-HO Is it possible for you to merge this one and the recorded one in to one graph? Maybe quantified.io is helpful? I did nor use it yet, but have seen a lot of such stuff is done in there by others…
-
@johann-fuehrer Jup that is possible
-
@mario_b
yes I am aware that you switch off fused alti when manual calibrating during an activity recording.
Here’s the sea level pressure with the altitude profile.@Dimitrios-Kanellopoulos
I don’t know who to do an overlay… but if I do an overlay, it would be necessary to have it almost idential from the drawn to the recorded track to have the best comparison, right?
living sideways
-
@TELE-HO update 2 activiteis / routes to QS.
Select them on the table
Press merge
Use the distance axis when viewing -
@TELE-HO for a GPX track you can get “real” altitude information here i.e. https://www.gpsvisualizer.com/elevation but I do not know how exact that is…
-
@johann-fuehrer … it’s a 30m x 30m grid SRTM1
-
Runanalyze!
-
@TELE-HO perfect. i think you’ve being right, as you said, that i could be, because you calibrated it on the gondola.
as you can see, fused-alti is correcting the altitude all the time on the activity to a higher altitude. is the altitude value on the end of the activity nearly correct? -
@mario_b
yes, it is absolutely correct at the end.I just noticed that I’ve had a GPS precision issue for the first 35minutes of this activity anyway. I wanted to redraw the exact route but saw that the signal was off track at the beginning… it does not make sense to overlay my recorded move with a drawn route I think.
-
@TELE-HO so i would say, there is nothing wrong with your watch. looking at the ambient pressure at around 930 (which is not anough for the swiss the last weekend) i think it was only a faulty calibration at start. then fused alti kicked in, and corrected the altitude until it was nearly correct. (>1005 hpa at the end sound more possible too).
-
@mario_b same opinion. Somewhere at 1 h 15 mins after start it started to look ok.
-
@Dimitrios-Kanellopoulos Thanks
. Again, sounds logic.
After my test that I described below I have this doubt: you know with which frequency the S9B take samples of the barometer to calculate and show the altitude? or which is the frequency that update the altitude displayed?I made a simple test using the S9B, Mobile with barometer and Samsung Gear Frontier. I went downstairs one floor (~4m difference).
1st try: S9B not show differences even after ~20sec or a bit more. Mobile and Gear displays the -4m variation instantly, the altitude on these both devices is continuing updating almost on each step that I do down.
I went up. Mobile and Gear displays the variation of +4m. S9B again no differences. After around 5 minutes, I see that the S9B display me a -4m difference (wrong), looks like displays me the value from when I was down, but do not register that I went up again.2nd try: Mobile & Gear again displays correct results instantly and continuously. S9B: I decide give more time waiting on each floor. After few seconds or minute waiting on the lower floor, start to display me a variation of -3m, after few minutes I get the -4m. I went up again, +4m after few seconds or almost a minute.
Results: Mobile & Gear displayed correct value all the times and instantly. S9B worked tricky. One time showed me a correct result but maintained the difference error created on 1st try. 2nd try was perfect, but need sometime to show me the correct values.
-
@flypg I have read about some threshold value which must be reached until an altitude change is recognized by the watch, I think it was about 3m or somewhere in that range. Maybe this kicks in as well …
-
@johann-fuehrer Thanks, yes, this is why I would like know with precision to understand a bit more the watch. I think that also exist some timelapse to process this or display this and this results in the “delay” that I see to display the information.
-
@flypg if it’s the same algorythm that is used in the ambit3 peak for automatic mode then:
When in watch mode, it messures every 10 sec. if you move up/down more then 5 meters in elevation (around 0,6hpa) in 3 minutes, it switches to alti-mode. when your are moving less then 5 meters in 12 minutes the watch switches back to baro-mode -
Thanks @mario_b! Now I can understand for what on 1st try the reaction not was immediately and I got better results on 2nd try.
it messures every 10 sec
Wow, I imagined that should be a lower value, by this I expected a faster response in the update of the altitude readings. But really not need a faster update in watch mode, because for this I have the Sport Modes.
Thanks to everyone again! -
@flypg it counts higher than 3-5m variations in 12 minutes. If you would go a bit more low then both devices should react the same.
That is to wipe out pressure changes as we talked before
-
If you are at a constant altitude (less than 5 meters of vertical movement within 12 minutes), your watch interprets air pressure changes as weather changes and adjusts the barometer graph accordingly.
-
Thanks again to everyone!
Yes @Dimitrios-Kanellopoulos, this explains that on all my attempts I generated a altitude variation > 30m in less than 12 minutes (because I went up and down several times more than the 2 tests).
The only that is not totally clear is the variation of 1st try that the S9B not registered this +4 of when I went up. -
@Dimitrios-Kanellopoulos I have a Spartan Ultra: I’m sitting at the moment in my office at 214m above sea level. I know from the weather station on my altitude just some 2km away, that we have 2015.4 hPa at 30 C temperature. My watch shows me 2021 hPa. If I like to have a correct pressure reading, I would have to change the altitude to 165m. SO how can I bring this together to see correct altitude AND correct pressure?
Hello! It looks like you're interested in this conversation, but you don't have an account yet.
Getting fed up of having to scroll through the same posts each visit? When you register for an account, you'll always come back to exactly where you were before, and choose to be notified of new replies (either via email, or push notification). You'll also be able to save bookmarks and upvote posts to show your appreciation to other community members.
With your input, this post could be even better 💗
Register Login