all.grb question
Post by iconPost by fab | 2020-12-22 | 08:44:48

Hi Cvetan,

I noted a difference between all.grib ( GFS 1° ) and the game interface.
I checked the values at integer points. ie with no interpolation.

I suppose a rounding process made by VR.

Have you informations about this process.

IMO : speeds are converted to km/h ( 1 decimal ) and angles are integer. Low speeds are 2 Kn min.

Am I right ?

thx for your help.

commenticon 2 Comments
Post by iconPost by zezo | 2020-12-23 | 17:56:41
Speeds are in m/s, GRIB U/V.

But VR uses an encoding to 1-byte signed integer (+/-128). The value is square root of the actual speed, multiplied by a coefficient.

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

Post by iconPost by fab | 2020-12-23 | 23:19:19
Thanks Cvetan.

I'll try to post process NOAA GRIB in order to integrate this "rounding" procedure,
and maybe increase the resolution 1°->0.5° by applying the interpolation algorithm found in your js.

fair winds.



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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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coordonnées de la zone d'exclusion des glaces pour logiciels de routage.
6
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Gribs update on zezo
9
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2 differents solutions with zezo
2
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Discussion regarding the strategy on VGV2020
10
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Problème de pointage
3
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Is VR down
22
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Another server crash at 15:10 ?
12
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How can I see the Pack options of other boats on Zezo?
3
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"route zezo.org" extensions installed but do not appear and cannot be activated, even when zezo is running
5
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clarification - Ice exclusion zone for dummies
18
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The wheather uptade on Zezo is incomplete
3
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Troubles with VR & ZEZO on Big Sur for MacOS
3
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Problème routage Vendéglobe 2020
16
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TJV 2020
7
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doldrums = zero impact ? pot au noir on s'en fout ?
7
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Polar Chart
3
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Mauvaise voile en FULL PACK Bad sail in FULL PACK
10
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destination with step ?
3
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Coordinates ZEZO vs VR
4
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factor in red ?
3
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Mark
9
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toxcct's Polars Generator up to date for the Vendée Globe
36
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is there a way to change the "start time" for a simulation?
10
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Zezo will he adapt to the ZEA not to cross?
8
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VRDashboard log
3
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