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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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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Problem with blue, red and green lines
13
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NMEA to Google Earth
23
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Dashboard 3.14.1 is reporting wrong TWD in NMEA
6
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DTL in Dashboard?
6
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Who is writing in zezo???
1
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lignes des glaces differentes ZEZO et VR
8
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Jibs speed penality
2
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Récupération de la position des bateaux (amis ou suivis) depuis ZEZO vers QtVlm
14
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Plus de données notée
3
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weird new behavior /!\
2
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Inconsistency btw green line and isochrone
2
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Mobile Apps Weather4VR and SailGrib4VR
12
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Basic game question
7
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No more wind indications?
8
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Coordinating timing start of route calculation with position
6
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Difference between Zezo gribs and zezo chart
3
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routing and boat speed
6
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Isochrones missing after 105°E
6
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GREAT Jean Le Cam - Viva Eric Escoffier!
4
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ZEA (Antarctic Explosion Zone) not up to date on the Dashboard
4
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Lignes noir / bleu / rouge ne s'affiche plus
3
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ICE LIGNE
13
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Problem on visual MAP on Dashboard 3.12.11
5
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CDN test #3
18
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zezo polars vs VR polars
5
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Nardin Watch challenge
3
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Little square in toggle tracks ?
3
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CDN test
6
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Data underline in red in dashboard
2
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Some changes - caching/CDN
11
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VR Dashboard Version 3.13.1
11
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Zone de glace
3
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Bugged buoy in the programmer turns the yacht at heading 0,0
13
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New VR failure mode
13
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10-minute between predicted Zezo TWS and actual game TWS
4
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New server for Zezo?
16
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When does the red exclusion line whill be extended?
5
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Are the polars static? Seems some creep since start.
11
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How to find best TWA for positions in the future - Question for beginner
6
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Starting now to use ZEZO
2
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algorithm current position and speed
7
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VR winds issue
24
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NMEA and AIS Yes ! but....
1
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Display forecast timestamp
2
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Server still down ? Server de nouveau au tapis ?
9
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manage several NMEA outputs with VR dashboard
4
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NMEA message format
12
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New Feature
3
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Foils
3
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VR Dashboard v3.12.10
31
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Toogle Tools
3
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Error Winds display
2
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flip-flop hours Grib confused following this morning's article
6
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Ligne noir/rouge
7
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