How are VR files .wnd structured ?
Post by iconPost by Reves_de_gosse | 2023-07-01 | 09:12:45

Hi Cvetan
VR sends weather files from NOAA to our PCs as .wnd files.
for example : https://static.virtualregatta.com/winds/live/20230701/00/006.wnd
But I can't read them.
Could you tell us what their structure is, and how to read them ?
Thanks

commenticon 7 Comments
Post by iconPost by zezo | 2023-07-02 | 18:53:43
8-bit signed integer U/V values

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 zezo | 2023-07-02 | 19:43:16
And then to TWD/TWS

function uv2d(u, v) {
var d = Math.atan2(u,v) * 180/Math.PI + 180;
if (d < 0)
d += 360;
else if (d >= 360)
d -= 360;
return d;
}

function uv2s(u,v) {
return Math.sqrt(u*u + v*v);
}

Post by iconPost by Reves_de_gosse | 2023-07-04 | 13:24:05
Thanks, I will try it.

Post by iconPost by plux | 2023-08-16 | 15:23:22
Hello
Thank's for your great works.
files wnd are binary encoded howto decode them ?
Tks
Post by iconPost by Hardtack | 2023-08-20 | 17:15:45
The files contain U and V wind components as single bytes - equaling to two bytes per data point.
Cvetan actually provided the function to decode the values above, along with functions to convert U and V to wind speed and direction.

Your task is to figure out the order in which the bytes are stored. Obviously it's a serialized 3D matrix (lat, lon, component), but you have to find the order in which the columns are written, as well as the order of values in a columns. I'd expect U and V first by latitude, then by longitude, north to south and west to east. In pseudo code:



for lat from 90 downto -90

  for lon from 0 to 359

    wind[lat,lon].u = read(file)

    wind[lat,lon].v = read(file)

  end

end


Post by iconPost by plux | 2023-08-22 | 12:34:26
nice, tks fo explanation
Post by iconPost by Reves_de_gosse | 2023-10-01 | 08:16:07
En fait, aujourd'hui, lorsque VR utilise une prédiction météo en 1°, ils utilisent les fichiers .wnd comme décrit plus haut.
Mais en 0.25, ils utilisent des fichiers .grb, qui sont des Gribs standards.

In fact, today, when VR uses a weather forecast in 1°, they use the .wnd files as described above.
But in 0.25°, they use the .grb files, which are standard Gribs.

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sliding VSR
16
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Trying to use Zezo to select best combination of sails to select
7
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TARA OCEAN 3
9
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RORC Transatlantique Race
6
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Game appears stuck on 00Z weather from yesterday
4
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Sydney to Auckland
28
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Personal Message pages deleted
7
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New zezo fonction
2
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VR Ranking 2021
7
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Autosail malfunction
3
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Comments from a newbie to "long term" routing
1
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Massive thanks to Cvetan
7
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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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