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Woo Screen App - real time jump display

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joriws
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Re: Woo Screen App - real time jump display

Postby joriws » Sat Mar 21, 2020 5:18 pm

aleks wrote:
Fri Mar 20, 2020 3:18 pm
Actually Android GPS API returns timestamp in nanoseconds for every position reported - more than enough accuracy. It is probably Sportstracker's problem that it doesn't save it in GPX-file properly.

I think speed reported by GPS API is somehow already adjusted based on the current position's accuracy. At least that is what I see on the watches - when you start GPS, reported location can jump around, but the speed often stays at 0.
You are ofcourse right, I checked LocationManager API-calls, last time did 5y ago or something and I think I did not find that GPS clock was returned on locationupdata callbacks. I think GPS timestamps was available via NMEA-only. But memories are so vague..

Here is screenshot of one investigation of SportsTracker GPX file. 142km/h speed and for some reason timestamp quality is what it is. Ka72.com dropped speeds by acceleration analysis, track gave 4g accelerations without filtering. Drag racer accelerations.
sporttracker_gpx_timestamps.jpg

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aleks
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Re: Woo Screen App - real time jump display

Postby aleks » Sat Mar 21, 2020 8:27 pm

I can definitely fix that if I do tracking.

BTW, which SportsTracker app do you refer to? Can you give me a Play store link to it?

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Re: Woo Screen App - real time jump display

Postby davedej » Sat Mar 21, 2020 10:51 pm

Interesting!
Do you need an internet connection on the phone?
And does ik work with (Android phone in my suit) with a Samsung watch (Tizen)?

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aleks
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Re: Woo Screen App - real time jump display

Postby aleks » Sat Mar 21, 2020 11:56 pm

davedej wrote:
Sat Mar 21, 2020 10:51 pm
Interesting!
Do you need an internet connection on the phone?
And does ik work with (Android phone in my suit) with a Samsung watch (Tizen)?

Dave
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No internet connection is needed, you can use a cheap spare Android phone (OS 4.3 and above) even without a sim card. If you want to use the notifications workaround and see jump height on a watch (like in the video below), it will work with any watch that can display text of notifications, including Samsung Tizen watches. Your watch would have to be connected to the phone you use during the session though. For Android Wear OS watches phone is not needed - Woo Screen app installs on them directly and runs without a phone.

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joriws
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Re: Woo Screen App - real time jump display

Postby joriws » Sun Mar 22, 2020 8:55 am

aleks wrote:
Sat Mar 21, 2020 8:27 pm
BTW, which SportsTracker app do you refer to? Can you give me a Play store link to it?
"Sports Tracker", maybe the very first gps-based mobile phone sport tracking app.

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aleks
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Re: Woo Screen App - real time jump display

Postby aleks » Sun Mar 22, 2020 5:56 pm

joriws wrote:
Sun Mar 22, 2020 8:55 am
aleks wrote:
Sat Mar 21, 2020 8:27 pm
BTW, which SportsTracker app do you refer to? Can you give me a Play store link to it?
"Sports Tracker", maybe the very first gps-based mobile phone sport tracking app.
Can you post a Play store link to it? Searching for "Sports Tracker" in Play store comes back with a bunch of very similar looking apps with nearly identical names, not sure which one you refer to. Thanks!

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Re: Woo Screen App - real time jump display

Postby joriws » Sun Mar 22, 2020 6:11 pm

aleks wrote:
Sun Mar 22, 2020 5:56 pm
Can you post a Play store link to it? Searching for "Sports Tracker" in Play store comes back with a bunch of very similar looking apps with nearly identical names, not sure which one you refer to. Thanks!
"Sports Tracker Running Cycling"

I hope this URL works, as it does not look "sane" URL. https://play.google.com/store/apps/deta ... tt.android

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Re: Woo Screen App - real time jump display

Postby aleks » Sun Mar 22, 2020 6:38 pm

Got it, thanks. That is a monstrous app! Doesn't look like it is suited for water very well though.

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Re: Woo Screen App - real time jump display

Postby joriws » Sun Mar 22, 2020 8:44 pm

aleks wrote:
Sun Mar 22, 2020 6:38 pm
Got it, thanks. That is a monstrous app! Doesn't look like it is suited for water very well though.
One friend used that for snowkite speed records. It gave so suspicious results that I investigated why and found the irregular time stamps.

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Re: Woo Screen App - real time jump display

Postby aleks » Sun Mar 22, 2020 8:52 pm

I just checked permissions for Sport Tracker's watch app - it doesn't request location at all. It looks like you must have your phone with you at all times during the session, which is silly, especially for runners (not to mention kiters :roll: ).


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