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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Request for explanation: Zezo updates (deadlines)
3
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Updating boat position on zezo
2
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Buoys in the record race
6
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Summer Cup
13
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new VR penalties
8
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VR Dashboard 3.16
10
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Estimated Record Time on a record race
8
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no updates since yesterday !!
3
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Predicted times color background
3
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polar NY - SF
2
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Can you go around ground based on the ghost boat ?
9
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[Globe 40 (477)] TWA curve differs from navigation dots by about 5°
2
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Global 40 - new Class 40 polars
16
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Globe 40 on credits
4
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olympic race - which route to choose?
52
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Atlantic record bugg zezo Goto Lizard
3
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Figaro 3 Polars Winches
24
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Bit Sailor Router in RealSail
2
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Modification de destination
1
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Silent debugging
14
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How to manage buoys during absence
6
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Vela- route choosen by your mom
6
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VR Team ranking race criteria
1
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No news from Virtual Regatta about VOR (the ocean race).
1
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Log-in VR game marathon..
5
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VR Dashboard
5
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Dashboard - Precdicted Time ATLANTIC RECORD
1
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the prawn star
9
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polars virtual regatta
8
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how to convert Grib files to Grib2?
3
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VSR, XP points
7
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Predicted times
3
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Nord Stream *3*
11
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Game on 12Z, but Zezo still working with 06Z
3
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race wait points
1
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special boats?
7
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VR Dashboard in Firefox?
6
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ESCARGOT CLASS
11
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Los Angeles - Honolulu
26
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Rounding a Buoy
12
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VR Waypoint Heavy Bug Reporting
3
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Time of ending Jules Verne
4
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Shore detection by Zezo
2
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Nord Stream Race 2
7
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Trying to Break the VR Map Mistery !
3
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Navigating to "xxx.0" TWA
26
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Tara4 - no refresh
2
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Jules Verne: Inconsistency of headings and speeds, simulation !!
5
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VR, Zezo, Qtvlm card offsets
2
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Island's coordinates
34
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Tara Ocean 4
6
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Solo Maitre Coq
21
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Adjustable timeshift ?
3
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gate crossing question
7
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Expanded View on PC
3
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Panic at VR Nord
7
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Delays during the sail changes, or directions changes
3
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(Game wind = Zezo wind ) ⍯ (Grib winds = Windy.com)
7
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VR ending the ELO ranking.
34
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NMEA feed
128
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Dashboard Map Track Label not including the segment.tag
5
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VR ingame time
6
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VIRTUAL REGATTA and Phillip Ganier. Worst and worst every day...
7
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beta.realsail.net
2
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Escort Frigate
6
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Out of memory. If you are the developer of this content ....
17
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Question about GFS Grib
5
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RORC Caribbean 600
14
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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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