intraday elevation data missed

[terraincure]

My Fitbit Versa measures the barometer data correctly, but through the web API I get only zeros as an intraday elevation and floors data

[GordonFitbit]

Hi @terraincure 

I test elevation and floors using the Web API Explorer against my own data and I see intraday elevation and floors.   Would you please try this too?

https://dev.fitbit.com/build/reference/web-api/explore/

Best,

Gordon

[terraincure]

Hello, Gordon,

Thank you very much for your reply.

Of course, I did, please, see the screenshot below.

 I guess the reason is that I use a 2-year old Versa, and somehow Fitbit server didn't calculate or save the elevation and floors data using barometer data from my Versa. The baro sensor seems alright, please see the photo below. What could it be?

Regards,

Oleksandr

[GordonFitbit]

Hi @terraincure 

Would you please private message me your Fitbit user ID so I may look at the data that is uploaded to our server?  

Thanks!

Gordon

[GordonFitbit]

Hi @terraincure 

Thank you for providing me your user id.   Based on the example you provided in this thread, I looked at your data on 2021-01-09.   I see you have elevation changes that occur in the 4pm hour (16:00) not 3pm (15:00).  You can see this by logging into your Fitbit.com account, click Log -> Activities -> and select floors.   I tested all the intraday endpoints using the elevation resource and detail-level = 1min during that timeframe and see elevation data being returned.

Would you please double check this on your end?

[terraincure]

Hello, Gordon,

Yes, I already have the elevation data on 2021-01-09 in the 16:00, please see above. I am sure that this data does not reflect reality. 

For better understanding I picked another route example with the height differences of more than 30m, please see the Google Fit screenshot above. 

Here the screenshot from Google Earth with the elevation profile of this route.

Here's the Fitbit Web API showing the same really strange peaks. 

I hope you will be able to find the right answer 

Best,

Oleksandr Tugayev

[terraincure · Accepted solution]

I think I have a clue.

Fitbit's algorithms calculate elevation and floors as natural numbers, they are positive for both ascending and descending. You can see it perfectly in the collage of three charts: from Fitbit Fit, Fitbit Web API, and Google Fit.

Or am I wrong? Where can I find it in the docs?