www.ka72.com/
The site now returns all results used for the GPS Team Challenge (doppler only, and still no support for anything other than SBN files.)
I'm still refining some of the results. I'm very happy with them generally, but still getting the odd unusual figure for Alpha, and the total distance is a little bloated.
Please give it a go and get back to me if you spot significant oddities.
Since the first beta went live last weekend, there have been more than 40 SBN files (plus a smattering of SBP and GPX files) submitted.
Every one of the SBN files that was uploaded was successfully read, and results returned. I haven't finished cross-checking the results for all of them, but on the whole I'm very happy with them so far.
Dylan.
Here are my results for the 2nd November.
The numbers I posted on the GTC site are in bold after the KA72 analysis:
KA72 reader:
2 Second Peak (kts): 28.48 (28.482)
5x10 Average (kts): 27.31 (26.942)
1 Hr (kts): 15.78 (15.772)
Alpha 500: 17.34 (17.656)
Nautical Mile (kts): 21.39 (21.386)
Total Dist (dop): 38.01 (38.002)
Looks very promising!
The difference in Alpha 500 is due to your using trackpoints for the Alpha. My site insists on using doppler. That's probably going to be a little bit controversial for existing GT-11 users, but since there probably won't be any more of them, I decided to be a bit more conservative and go with the measure that is better supported in the GT-31.
When I open your file in RealSpeed, I get 27.31 knots for the 5x10 too. So the site result is consistant with Realspeed, even though what you entered was a bit lower.
I'd call that one a complete success.
I should also mention that I tightened up the 1hr algorithm last night too. One thing that Realspeed does is to ignore speed for trackpoints that are over 200 seconds in duration. This means that time spent sitting around on a sandbank or swapping out gear won't be recorded as "700 seconds of travelling at 1.38 knots" and instead will be recorded as "700 seconds of standing still."
That's a good tip for you guys, if you are going to hang about and have a chat, keep it under 3 minutes and you will improve your 1hr speed!
I also tightened up the time based calculations (1hour, 2sec, 10sec) to use the creation date of the first and last records as the endpoints, whereas previously I was calculating cumulative time in seconds for each result.
So whereas previously my test data was within 0.3kts of the Realspeed results, now it is within 0.1kts.
That 200 seconds thing is the "time threshold"... It shouldn't come into play for the 1hr.
No filters are applied to any of the measures apart from the 200 seconds alluded to above.
There is no concept of one-per-run filtering. If your two top 10sec speeds occur on the same run, they will be included in the 5x10 generated at the site.
However, having said that, overlapping sections are not allowed except where the first point in one speed is the last point in another.
All speeds are averaged so that n seconds is calculated over n+1 seconds. This is the default MO of Realspeed, and optional in other systems.
All speeds are based on doppler.
Comes up good for yesterdays file. I updated GT31 to latest yesterday V1.2(B1218T) but still shows may not be optimum.
Surely this will make Nebbs life heaps easier.
Well done, Dylan.
Just an ethical question. I know this will make many peoples lives easier but how about the revenue stream for the likes of Mal to keep improving the software? Surely this will mean that newcomers will no longer contribute to what is already really a labour of love. I know Dylan is doing his own calcs but isnt the Alpha idea Mal's baby?
Not judging just putting up the point for discussion and concerned that those that have done a huge amount don't get cut out.
Dylan, just uploaded my tracks, was close but some numbers not same.
You can view the difference by checking out my numbers on GPS team site data under Pinnas and what the program gave me.
The file was uploaded raw from card file, no invalids deleted, no slow points deleted. I delete all slow points under 3 knots.
Mike
Hey Mineral
I've still got a worse alpha than you - I'm with Elmo - what is this obsession with corners & turning
[}:)]
[}:)] Have been at it for a while now to learn how to gybe, I crash most of them and resort to @#$$@#$ water start. But its getting slowly ever soooo slowly better.
