GRIB2 PlugIn

[rgleason]

I look forward to installing v4.2.1 with grib2 and testing, hopefully tomorrow. Sean we wish you a safe voyage!

[Rasbats]

did-g,

>>URLs in my previous post are still active, IBI current, SHOM current and wave, Meteo France Arome and Arpege.

Could you point me in the direction of that post please?

Thanks,
Mike

[did-g]

Hi,

Originally Posted by Rasbats

did-g,

>>URLs in my previous post are still active, IBI current, SHOM current and wave, Meteo France Arome and Arpege.

Could you point me in the direction of that post please?

Thanks,
Mike

http://www.cruisersforum.com/forums/...n2-152224.html

[Rasbats]

Testing ....

1. File extensions of 'grb2' (BSH) and 'grib2' (Meteo-France) are not recognised. Used 'All Files' and got the gribs for display that way.

2. With tidal currents Grib2 from BSH there is no 'data at cursor position' for current direction/speed. (Grib1 from BSH displays the interpolated data correctly)

(Since O 4.0.0 the checkboxes for wind barbs and isobars do not select/de-select the display of those items)

Mike

[rgleason]

v4.2.1 Downloaded and installed
http://opencpn.navnux.org/beta/opencpn_4.2.1_setup.exe

Tested with files from
ftp://ftp.bsh.de/Stroemungsvorhersagen/ both Grib1 & Grib2 - work
ibi.grb without pdf - does not work, no data.
RTofs currenty gribs - work.

Should we be dowloading NOAA's Weather and Climate Toolkit?
NOAA's Weather and Climate Toolkit (Viewer and Data Exporter)
Would it make it easier to get Grib2 files? Linux, Win, Osx
NOAA's Weather and Climate Toolkit (Viewer and Data Exporter)

Here is the data guide NOAA's Weather and Climate Toolkit (Viewer and Data Exporter)
but I am looking for easy ways to download grib2.

Found these FTP sites
https://www.ncdc.noaa.gov/data-acces...ast-system-gfs
but the server started asking for user and pass after first try also those files were big 64 mb.

Any suggestions?

ftp://nomads.ncdc.noaa.gov/GFS/analy...1602/20160226/

[rgleason]

ftp://nomads.ncdc.noaa.gov/GFS/Grid4/201601/20160128/
This one seems to be downloading. 65mb!

gfs_4_20160128_0000_021.grb2 65mb

says it cannot be read. O does not crash. Grib2_pi just does not see any data.

[rgleason]

Index of /data/nccf/com/estofs/prod/estofs.20160226
downloaded four of these 2mb grib2 and no valid data.

got some 7mb grib2 of Atlantic Waves and Atlantic Wind and they work.

-Comment: It would be nice if we did not have to select "All" file types all the time.
Add grb2, grib2 etc.

I think I need to get zygrib on this computer with my account. That will solve the finding grib2 issue.

[rgleason]

From the graphic on this page
Ocean Prediction Center Gridded Marine Forecasts

This is a bookmark to NE USA graphical display Wind & Waves, but there seems to be no way to export it and I don't know if it is using grib2:
National Weather Service - Graphical Forecast

Also have not been able to confirm if zygrib is using grib2 yet.

[maitai]

zyGrib does not read grib2 format, qtVlm does. We have similar problems extracting a valid grib1 or grib2 file from myOcean data. Still working on that.

[rgleason]

maitai,
Thanks very much. That is great that qtVlm supports Grib2, I should start using it again, to keep the mindset!

Just found that zygrib does not support grib2 as you report, but will try myOcean as you suggest.

Grib2_pi seems to be reading a number of grib2 sources, but I found a XXXX.bin type that it does not support either, along with some others below, (which may not be good for testing as far as I know.)

[Rasbats]

I have been comparing tidal current data from two sets of data using the Grib2 plugin:

1. ibi.nc
2. ucurr.grib/vcurr.grib made by CDO (Climate Data Objects) from ibi.nc

ibi.nc was downloaded from Copernicus.

ibi.nc has a start time of 2016-03-05 12:00:00 but Grib2 times start from 14:00:00.

Using ncdump I can confirm the start time of 12:00:00.

The arrows shown by Grib2 for 14:00:00 are data for 12:00:00.

Grb2 data from BSH is correctly shown by Grib2.

BSH data has an interval of 30 minutes. Copernicus data is hourly. Does this cause a problem for the plugin?

Also interesting that the "hours since" shown for the file (at top of the screen) is the start date/time (2011-03-31 00:00:00) + 1 hour.

Mike

[Ptizef]

Hi Dave

I have downloaded and installed your 4.1 Windows build

I have very few grib2 files to test
- One from french "AROME" model .
https://donneespubliques.meteofrance...id_rubrique=51
Is named with ".grib2" termination . So it don't shows up in the file selector. I renamed it with ".grb" termination. Then I get "no valid data"
- One from https://meteo.gc.ca/grib/grib2_ens_naefs_f.html
Is also named with .grib2" termination.
Got "no valid data" when renamed it like above
- One from ftp://ftp.bsh.de/Stroemungsvorhersagen/
is named with ".grb2" termination so I add to rename it
Then the current data are shown but only at some zoom level

Tried to built with VS2010, but as you said it don't work
Got errors messages (and lot of warnings) (see thread grib2 branch)

Regards
Jean Pierre

[rgleason]

Translated french link below
https://translate.google.com/transla...3D51&sandbox=1

Translated
https://translate.google.com/transla...-text=&act=url

Leads to
Index of /ensemble/naefs/grib2/raw

Picked one path
Index of /ensemble/naefs/grib2/raw/00/000

Downloaded each type and tested. Not many work but some do.

[rgleason]

I have been looking for a good Grib2 downloader.
First I thought predictwind would be good. It is, but it is not Grib2 as far as I can determine, nor is Zygrib.

The one I've found so far is DeGrib NDFD Grib2Decoder
Degrib: Download

I have downloaded bin files and been able to select multiple files to make an image, but I have not been able to make it make a grib file composed of the data I want. However I think this is what it does. It will take some more messing around.

Others familiar, please post your hints.

[rgleason]

Degrib: Test Suites
It looks like there are script files that create three types of files (.shp, .shx, and .dbf) for Arcview. How do we do the same for grb2?

Here is the manual
http://www.nws.noaa.gov/mdl/NDFD_GRI...al.php#getData

Example degrib command

• Uses degrib to format a 12 hourly summarization product using NDFD data for all times:
  
  /degrib/bin/degrib /degrib/data -P -pnt 38.98,-77.07 -XML 12-hourly -ndfdConven 2 -geoData /degrib/data/geodata

Is degrib capable of producing the type of files Grib2_pi can use? What types of files can Grib2 use just grb2?

Looks to me like we need to create a command line because tkdegrib does not do it. We could use Pavel's "Launcher_pi" to setup a reasonable way to download on a regular basis for testing.
We can then change this command line as needed for testing. Just an idea at this point. Now need to figure out a reasonable command line.