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Trace errors compared to Woo

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bmcfiv
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Local Beach: Sullivan's Island / Breach / IOP
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Trace errors compared to Woo

Postby bmcfiv » Thu Jan 25, 2018 4:58 am

Summary
The Trace’s height accuracy and jump recognition is somewhere between mediocre and atrocious.

What
I’ve been using the Trace for a half year, and had my first session with a Woo yesterday. I compared the results in the charts below to gauge accuracy. The Trace results have been very frustrating. Jumps I know I went high registered low. Strange readings. Missed jumps. High jumps when I didn’t jump… ect. So going out with two sensors, I couldn’t but help compare the results.

Setup
Just moved from LF Envy to an Eleveight FS (12M for session)… for what it’s worth, ceteris parabis, I’m jumping 50% higher with the new kite and broke my record in 19 knots of wind. Previous high was on a LF Envy 7M in 35 knots. 1 hour session on Breach Inlet, Sullivan’s Island SC.

How
I basically took a screenshot of the entire session the OCR’ed the pdf to Google sheets so all data was captured. I then matched jumps as best I could. I’m sure there are errors, but I would look at a Trace track, then compare it to the timestamp and height of the Woo recordings. This took over 20 minutes and was a nightmare b/c the data was all over the map. But I believe I’m around 95% accurate.

Other posts
I’ve seen other posts comparing Trace vs Woo vs Xensr. The findings are pro Woo and Trace, but that was not my experience at all with the Trace so I felt compelled to run my own. Disclaimer… I’m no math expert so please take all of this with a grain of salt.

Analysis
I ran two analyses.

One compared the entire session to the other. Because there were so many unmatched entries, had to take a high level view of the results.

The other was all matched jumps over 15ft. Basically, I believe I was able to match each entry for both the Woo and the Trace here.

Here is a link to the spreadsheet. https://goo.gl/n8hvYM

Session results
Main takeaways:
  • Trace missed many jumps
    Some jumps marked on gps didn’t make sense (they are wrong)
    The data was too messy to match small jumps with a high degree of accuracy
    Timestamp would go a long way
    Results frequently did not match up with memory
Noteworthy data comments:
  • Trace missed 33% of Woo’s jump readings, Woo missed 6% of Trace’s
    Woo picked up more substantially more low height jumps, and slightly more jumps over 15ft
    With two different data sets, comparing the values has limited value.
Image

Matched 15 ft or higher
So to really compare the results, I filtered out all jumps that were below 15 feet and unmatched, so that we could look at the data fairly. Main takeaways:
  • Trace height accuracy is poor
    Based on memory
    Based on viewing marked jump data with gps of track
    Based on Woo being accurate
    Trace height is lower by 15%
    Trace hang time is lower by 8%
    Trace G-force is lower by 14%
    The Woo data made sense based on memory and consistency compared to the Trace
    I can’t recall hang time or landing force details as well as jump height, but the charts show the differences between the Woo are significant
Data
Image

Air

Image

Time
Image

G-Force
Image

Trace errors
Jump not recorded, see downwind glide at the end of the track.
Image

Erroneous jump, xx feet but didn’t go downwind??? I don’t think so.
Image

Double entries, how can one jump twice, 15 ft and 22 feet in a single downwind glide… fail.
Image

Conclusion
I enjoy the gps element of the Trace, but the jump inaccuracies are problematic enough that if I had to choose it would be Woo by a long shot. Here’s to Trace improving their accuracy, or Woo adding GPS.
Last edited by bmcfiv on Fri Jan 26, 2018 10:16 am, edited 1 time in total.

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deniska
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Re: Trace errors compared to Woo

Postby deniska » Thu Jan 25, 2018 6:12 am

I returned my TRACE more than a year ago.. I am guessing they did not make any serious efforts to fix the problems..
In short, from what I gathered from their emails and exclusive FB forums:
- their initial algorithm was exaggerating the height.. think 20m in 3 seconds.. rocket speeds..
- people pointed out that this is not happening on this planet..
- their response was to blacklist most of the jumps lasting over than 5 seconds, with some other stupid (for kitesurfing) rules... it seems that they were mostly surfers with noone with kitesurfing experience...
- I got banned from the FB group for pointing out the obvious.. but the they were cool enough to refund me the money after not fixing obvious problems for a few months..

So, my conclusion at the time was: it's pretty consistent in mediocre conditions (think 15kts on 12m), but really sucks on big days..
The GPS actually helps to show their incompetence in detecting the jumps (you can see the zigzags with speed change and no jump data)..
The GPS is a nice feature...for downwinder, else it's just chaotic drawing of a mental patient.. and you can get it with most smartphones (just put them in plastic bag)
The video sync with gopro had some problems too...
No decent social integration/app...
crazy slow syncing...
and the list goes on...


I posted a review in the review section of the forum some time ago..

kiterocky
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Re: Trace errors compared to Woo

Postby kiterocky » Thu Jan 25, 2018 10:19 am

Compare a Toy with another Toy...😀😀

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ivarj
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Re: Trace errors compared to Woo

Postby ivarj » Thu Jan 25, 2018 10:19 am

Have you managed to sync Trace with GoPro footage and use the auto-edit feature?

I have tried a lot and never has the sync been successfull

bmcfiv
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Re: Trace errors compared to Woo

Postby bmcfiv » Thu Jan 25, 2018 1:22 pm

@deniska wow, everything you said matches my experience. i seem to have hit a height ceiling of 27.8 feet, even though some of those jumps felt higher than others. makes perfect sense they put some type of cut off. one day with woo (and new kite) and it says im breaking 30.

@iverj dont have gopro, would be cool but i perceive it as slightly vain, and id probably be the only one watching. that said, if it can help with technique, not too difficult to wear, and not too labor intensive, i should give it a try.

whoa! i could match video then add woo jump heights manually to video like my graph.... that would be mega thorn in traces side, maybe motivate them to fix. great idea.

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Re: Trace errors compared to Woo

Postby andylc » Thu Jan 25, 2018 2:13 pm

I thought my Trace was pretty cool...until it stopped working and customer service since then has been poor / non-existent. With the advent of Apple Watch app and really good smartphone tracking for other sports like skiing I’m not sure I’d bother with a dedicated tracker again. They’re all inaccurate in one way or another.

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deniska
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Re: Trace errors compared to Woo

Postby deniska » Thu Jan 25, 2018 5:12 pm

kiterocky wrote:
Thu Jan 25, 2018 10:19 am
Compare a Toy with another Toy...😀😀
Jesus, dude!
Do you get paid to troll woo and other trackers?
Every freaking thread is the same bark "toy, toy, toy"!
I think everyone got your stance on this already.. just chill!

andylc
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Re: Trace errors compared to Woo

Postby andylc » Thu Jan 25, 2018 5:25 pm

If by toy you mean something you don’t need that you own purely for the purpose of having fun then what kitesurfing equipment ISN’T a big toy???

bmcfiv
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Posts: 33
Joined: Thu Aug 24, 2017 6:55 am
Kiting since: 2016
Local Beach: Sullivan's Island / Breach / IOP
Style: a messy freestyle
Gear: Eleveight FS09 / FS12 / RS 14 / CS bar
Zephyr Ozone 17
Xenon Infra 136
Ronix Boots
Mystic X
Brand Affiliation: None

Re: Trace errors compared to Woo

Postby bmcfiv » Thu Jan 25, 2018 5:27 pm

deniska wrote:
Thu Jan 25, 2018 5:12 pm
kiterocky wrote:
Thu Jan 25, 2018 10:19 am
Compare a Toy with another Toy...😀😀
Jesus, dude!
Do you get paid to troll woo and other trackers?
Every freaking thread is the same bark "toy, toy, toy"!
I think everyone got your stance on this already.. just chill!
lol!!! i don't even understand what "Toy with another Toy" means.

Also, while my analysis is rudimentary, it is definitely helpful for me and others I talk to about the problem as we're trying to figure out what the hell is going on with our jumps. Now we know, it's bad data. The hope being Trace puts more effort into their algorithms if they want a large KB audience.

andylc
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Re: Trace errors compared to Woo

Postby andylc » Thu Jan 25, 2018 5:35 pm

What might be more useful would be determining if ANY of them are accurate - have comparatory videos been done where height can be accurately measured and then compared to what the device thinks the height is?
Last edited by andylc on Thu Jan 25, 2018 8:14 pm, edited 1 time in total.


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