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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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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Dashboard not updating.
6
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Boats Skins Vendée Globe
3
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Safari on iOS: Bearing lines gone
3
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Wrong coordinates in zezo
2
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Winds in the chart do not show changes between 78 hours and 114 hours forecast
2
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Decoding of All grib
6
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I CANNOT ENTER FOR 3 HOURS IN THE GAME
23
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Why the vc data is yellow underlined ?
3
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Jules Verne 2020 - "Start NOW" discrepancy VS real time
7
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Would like to know the reasenable time to update your pisition on zezo
16
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Arrival Vendée Globe in Normandy !!?
4
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MIssing the Obvious: How to get Zezo routes back into VR
2
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VG 2020-01-02 has Zezo a problem with geographic or ...
8
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How to retrieve a waypoint (TWA/HDG) that already passed...
16
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Track duration window
3
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Ways to bypass the client to give orders?
6
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Problem to Load zero route in windy.com
40
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French tutorial for zezo
4
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boat positioning
2
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Export routes in GPX format ?
4
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Sail selection issue ?
11
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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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