VR weather format
Post by iconPost by banfry | 2020-11-01 | 17:25:51

I am looking for the .wnd file format.
Looks like dx dy bytes on 181 * 360 degree.
But does not really match the App reading.

commenticon 7 Comments
Post by iconPost by zezo | 2020-11-01 | 18:44:13
It's 1 degree GRIB, 1-byte signed square root of the original U and V components, normalized to some value. Something like this:



function vr_speed(d) {

	if (d > 127) {

		d  = 256 - d;

    	return -(d*d)*(3600.0/230400.0);

	}	

    return (d*d)*(3600.0/230400.0);

}
Post by iconPost by banfry | 2020-11-03 | 22:04:25
Tks,
I guess the temporal extrapolation is linear. But what about the geographic interpolation ?
Bilinear ? Bicubic, Lagrange ?


Post by iconPost by zezo | 2020-11-03 | 22:09:45
Temporal is linear. With the quirk that during the weather update its linear once between old and new data for the past point in time, and then linear between that and the next point in time. But that's only on the client. Server is something different.

Spatial is complicated. Bilinear UV with compensation. Take a look at this file to get an idea http://zezo.org/mauricienne/iwind.js

Post by iconPost by banfry | 2020-11-03 | 22:33:24
tks I'll try it.
Post by iconPost by banfry | 2020-11-10 | 13:16:05
Hi,
it works fine except there a constant ~1 knt speed under estimation.
Any clue ?
Post by iconPost by zezo | 2020-11-10 | 14:06:00
There is a little rounding on the other side of the transfer, but it's not that much.

Conversion from grib UV to VR signed int looks like this:

my $d = shift;
my $sign = ($d < 0)?-1:1;
return $sign * round(sqrt(abs($d*230.4)));

I've been generating bit-exact copy of the wnd file this way.

The interpolation is linear (as in not dependent on units used - works fine on m/s or knots)
Post by iconPost by Tigrou26 | 2022-04-15 | 05:41:16
Did you succeed to decode the file .wnd ? What is the key to decode them ?

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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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a boat and 2 races
7
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Red timestamp in Dashboard
16
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Game frozen @ 15:30 GMT?
6
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ice exclusion zone for VG
82
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La meilleur voile
4
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Ice limit changed
19
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Ice limit penalty
29
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Action table no more on the race page
3
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la flotte du VR n'apparait pas sur zezo sur mon Macbook alors que je me suis bien identifié, mais que le joue sur Ipad
2
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