Post by iconPost by Ventura_317 | 2021-01-05 | 11:25:07

Looking for any post explaining more or less easily how to extract from an All grib file the TWS/TWD of a known position /date !

commenticon 5 Comments
Post by iconPost by Hardtack | 2021-01-05 | 13:47:43
http://zezo.org/forum.pl?tid=8284
It really only took scrolling half a page down to find it ;-)
Post by iconPost by Ventura_317 | 2021-01-05 | 15:44:39
Thanks hardtack but I am sure you can do much better for me !
Post by iconPost by zezo | 2021-01-05 | 16:49:16
All the code can be find in "cwind.js" used by each race page.

Only difference is it gets the U/V values from a PNG image used as binary data storage instead of GRIB file.

Decoding the GRIB is a bit more involved. I use text dumps internally and convert to my own binary format. GRIB itself is weird.
Post by iconPost by Ventura_317 | 2021-01-08 | 10:26:56
Thanks a lot Zezo !

Was looking fot the FORTRAN Prog WGrib which apparently is not any more available in the NOA Server
Post by iconPost by zezo | 2021-01-08 | 11:42:35
The current toolkit is https://www.ecmwf.int/en/elibrary/18135-grib-api

But I still use the old grib api and cnvgrib from NOAA to convert from v2 to v1. From the toolkit I mostly use grib_get_data to dump the U/V values to a set of text files which are further compiled into simple binary array for the router.

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Predicted times
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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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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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