routing differences bitSailor / zezo / offline
Post by iconPost by Sunkist | 2023-01-12 | 18:07:32

comparing zezo and bitsailor and a self made preparatory offline router

I found that the choose different ideal routes with similar settings. I can see this happening due to memory conservation (underlying grid size?!) or CPU conservation using polar coordinates in 5° steps and best VMG angles maybe. So if several routes are nearly identical in time, each router will find a different one due to rounding errors. So far so obvious.

What I do not understand is that the wave propagation front (or how you want to call it) varies significantly between zezo and bitsailor (offline version kind of similar to bitsailor). - Even making sure both use the same GFS run. what are the uncertainties in the routing that lead to this difference? is there a way to minimize them?
Is there a way to give a error-number or uncertainty to each location while performing the routing?

Cheers,
Sunke/Sunkist

commenticon 3 Comments
Post by iconPost by Hardtack | 2023-01-12 | 22:47:49
Given the same parameters - start time, start location, polars, boat options, forecast cycle - the wave propagation fronts (which we call isochrones) should really be very similar. Bitsailor uses the same wind interpolation as zezo, except for technical differences that may lead to different rounding errors. And bugs, possibly. Differences should be most noticeable in light wind conditions.

Bitsailor handles obstacles like islands less well than zezo. This can affect the isochrones sometimes. As the routers don't sail straight into the wind, adverse wind patterns can have the same effect.

There are a few other minor differences between zezo and bitsailor but it's hard to say what may cause the diverging results.

Regarding robustness of the route, I don't know of any way to assign error margins or confidence values to individual route points (assuming that's what you mean by locations).
An overall uncertainty of the optimal route could be derived from reverse routing. Neither zezo not bitsailor does that currently.

Post by iconPost by zezo | 2023-01-13 | 11:22:30
There might be difference in the temporal interpolation during the update cycle. I still have not implemented the supposed 3-grib algorithm.
Post by iconPost by Sunkist | 2023-01-16 | 17:03:57
I think the temporal interpolation during the upgrade process is something VR should worry about/improve ... don't need to mention the artifacts of moving pressure systems.

As soon as I find the time in the next week, I'll try to pin down the precise differences that can be observed. unfortunately quite busy right now. But thanks for your inputs.
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Fleet section mode record not working
2
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Possible routes on the Map tab
3
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Purple skippers on VR Dashboard
3
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UTC or CET time ?
2
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multiple routes?
2
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Real Sail
4
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Map a little gloomy
8
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Trophée Jules Verne - Route à l'envers ?
2
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Looks like weather updates offline for next 18h
26
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Bring the good old days back
7
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All.grib 0.0k ?
9
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different speed
3
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Strange 0.5 mille VR Scale
3
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Just an idea for a new feature...
7
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Connexion impossible
1
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Donations
7
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New leader - seems to be using Zezo
38
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Bravo Zezo
4
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zezo : Huge job - Huge thx
2
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Difference between boat speed display on VR, dashboard and polar curves
7
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Vendée Globe: Track lines falling too short of ischrones
8
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Tara Ocean
29
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VR winds currently not up to date ?
1
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"Sails Change" within the Programming
3
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RORC Transat finish moved to Antigua
3
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Weather update not appearing...
19
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Dashboard not updating.
6
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Boats Skins Vendée Globe
3
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Safari on iOS: Bearing lines gone
3
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Wrong coordinates in zezo
2
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Winds in the chart do not show changes between 78 hours and 114 hours forecast
2
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Decoding of All grib
6
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I CANNOT ENTER FOR 3 HOURS IN THE GAME
23
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Why the vc data is yellow underlined ?
3
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Jules Verne 2020 - "Start NOW" discrepancy VS real time
7
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Would like to know the reasenable time to update your pisition on zezo
16
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Arrival Vendée Globe in Normandy !!?
4
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MIssing the Obvious: How to get Zezo routes back into VR
2
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VG 2020-01-02 has Zezo a problem with geographic or ...
8
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How to retrieve a waypoint (TWA/HDG) that already passed...
16
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Track duration window
3
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Ways to bypass the client to give orders?
6
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Problem to Load zero route in windy.com
40
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French tutorial for zezo
4
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boat positioning
2
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Export routes in GPX format ?
4
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Sail selection issue ?
11
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Your friends boats in Google Earth
2
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Delay in Wind update ?N
1
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VR Dashboard
54
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Colone Tile red
3
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Destination setting - Fixer la destination
2
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Anyone else experiencing erratic course changing behavior?
9
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Looks like game winds not updating.
6
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difference between wind on he map and wind on the route
8
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Cape Horn route is not possible it is crossing land
6
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Lost the lines..
2
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all.grb question
3
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2 routings ?
1
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What point or line is being used to determine the rankings?
61
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180 degree bug and downwind track
11
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démarrer avec zezo au milieu de la course
2
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Local times in the charts
1
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red and green lines ahead of isochrones
13
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20 Minute tack
6
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nemo point challenge problem
8
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Nemo Point Challenge
51
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Point Nemoers
1
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Route doesn't give prediction over 24h anymore
7
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Iterations on server & Zezo
5
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Sidney-Hobart 2020
3
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To day zezo don’t give me any route
6
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Fatal Grib error tonight ?
2
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predicted times JV
3
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Loick Peyron uses zezo, the best virtual sailing router ;)
9
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Orthodromy vs loxodromy around the poles
6
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Strange 1st dot heading
3
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Campbell Island
4
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VR bugs and rants
11
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Cap constant, ou angle au vent ? Constant heading, or wind angle?
18
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Colors of wind in the chart
4
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Virtual Regatta API
2
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Compliment
12
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Cap Horn bug
3
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New forecast unavailable
32
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