Decoding of All grib
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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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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VR Dashboard V 3.12.9 worked great, but not anymore
31
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My boat
2
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clock stopped 23:50
71
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The server calculation rate has been reduced from 5 to 10 minutes
1
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Inaccurate wind and boat speed
10
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Reverse route
4
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phishing problem on internal links to the app (PC)
2
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Records 2020
12
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Lancement zezo impossible
3
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Import Zezo route in Qtvlm software
8
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Longitude and latitude
2
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What happens to commands you issue while server is down?
6
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SERVER DOWN ?
1
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Full Pack
3
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Vendée Globe
32
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HDG entre 2 points
12
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VR DASHBOARD NY-SF
7
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La Mauricienne
72
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