Grib files for Mariners transmitted by Outernet L-Band Satellite

[Littlechay]

Originally Posted by electronicmarin

UPDATE: We managed to have a decent signal on our antenna with no amplification at all, and now waiting for the high frecvency parts to start with the first circuit boards for testing... the antenna will have no moving parts and it's almost omnidirectional

Do you have a link for the antenna that you are using please? I'm busy moving countries at the moment but hope to have my workbench set up in a couple of weeks and I'd like to build a receiver for this service.

Secondly does anybody have more details of the contents of the GRIB file transmitted yet?

[LeaseOnLife]

Originally Posted by Littlechay

Secondly does anybody have more details of the contents of the GRIB file transmitted yet?

Chris

I have mine running since a few days, not much in terms of grib files. What I am seeing in the 'library' is a bunch of *.json files, used by the outernet weather app. The weather app is using Cameron Beccario's earth.nullschool.net viewer. This viewer needs the weather data as .json files: Each .json file contains data for the whole earth, but is only one parameter like "wind" and only for one point in time. The forecast for the next day is a separate file, as is a different parameter like rain.

Since I found a grib2json executable, I think the transmittal is actually a grib file, which then gets converted to a .json file after the grib file was received. There are some grib2 files also, but they only contain surface pressure, again for the whole earth, for one date.

A sample can be downloaded here:
https://drive.google.com/file/d/0B1c...ew?usp=sharing


Here is the output of ls -lRh in /mnt/downloads/Weather/data

ls -lRh
.:
total 676
-rw-r--r--    1 lison    lison      82.4K Sep 14 20:14 earth-topo-mobile.json
-rw-r--r--    1 lison    lison     583.2K Sep 14 20:14 earth-topo.json
drwxr-xr-x    2 lison    lison       4.0K Nov 24 01:35 oscar
drwxr-xr-x    4 root     root        4.0K Nov 20 01:39 weather

./oscar:
total 10420
-rw-r--r--    1 lison    lison       5.1M Oct 11 14:41 20161011-surface-currents-oscar-0.33.json
-rw-rw-r--    1 postgres postgres      47 Oct 13 00:05 catalog.json
-rw-rw-r--    1 postgres postgres    5.1M Nov 23 13:05 current-surface-currents-oscar-0.33.json

./weather:
total 8
drwxr-xr-x    3 root     root        4.0K Nov 20 01:39 2016
drwxr-xr-x    2 root     root        4.0K Nov 24 15:09 current

./weather/2016:
total 4
drwxr-xr-x   11 root     root        4.0K Nov 24 07:51 11

./weather/2016/11:
total 36
drwxr-xr-x    2 root     root        4.0K Nov 20 01:39 19
drwxr-xr-x    2 root     root        4.0K Nov 20 02:12 20
drwxr-xr-x    2 root     root        4.0K Nov 20 02:45 21
drwxr-xr-x    2 root     root        4.0K Nov 20 03:21 22
drwxr-xr-x    2 root     root        4.0K Nov 20 08:46 23
drwxr-xr-x    2 root     root        4.0K Nov 21 08:13 24
drwxr-xr-x    2 root     root        4.0K Nov 22 09:08 25
drwxr-xr-x    2 root     root        4.0K Nov 23 14:37 26
drwxr-xr-x    2 root     root        4.0K Nov 24 07:51 27

./weather/2016/11/19:
total 2096
-rw-r--r--    1 root     root      453.2K Nov 20 01:39 0000-mean_sea_level_pressure-gfs-1.0.json
-rw-r--r--    1 root     root      184.6K Nov 20 01:39 0000-relative_humidity-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      370.8K Nov 20 01:39 0000-temp-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      227.4K Nov 20 01:39 0000-total_cloud_water-gfs-1.0.json
-rw-r--r--    1 root     root      278.9K Nov 20 01:39 0000-total_precipitable_water-gfs-1.0.json
-rw-r--r--    1 root     root      571.1K Nov 20 01:39 0000-wind-surface-level-gfs-1.0.json

./weather/2016/11/20:
total 2100
-rw-r--r--    1 root     root      457.1K Nov 21 02:12 0000-mean_sea_level_pressure-gfs-1.0.json
-rw-r--r--    1 root     root      184.6K Nov 21 02:12 0000-relative_humidity-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      371.0K Nov 21 02:12 0000-temp-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      227.4K Nov 21 02:12 0000-total_cloud_water-gfs-1.0.json
-rw-r--r--    1 root     root      278.9K Nov 21 02:12 0000-total_precipitable_water-gfs-1.0.json
-rw-r--r--    1 root     root      570.1K Nov 21 02:12 0000-wind-surface-level-gfs-1.0.json

./weather/2016/11/21:
total 2100
-rw-r--r--    1 root     root      453.8K Nov 21 13:39 0000-mean_sea_level_pressure-gfs-1.0.json
-rw-r--r--    1 root     root      184.7K Nov 21 13:39 0000-relative_humidity-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      370.7K Nov 21 13:39 0000-temp-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      230.5K Nov 21 13:39 0000-total_cloud_water-gfs-1.0.json
-rw-r--r--    1 root     root      278.0K Nov 21 13:39 0000-total_precipitable_water-gfs-1.0.json
-rw-r--r--    1 root     root      570.0K Nov 21 13:39 0000-wind-surface-level-gfs-1.0.json

./weather/2016/11/22:
total 2104
-rw-r--r--    1 root     root      458.0K Nov 22 15:34 0000-mean_sea_level_pressure-gfs-1.0.json
-rw-r--r--    1 root     root      184.9K Nov 22 15:34 0000-relative_humidity-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      371.0K Nov 22 15:34 0000-temp-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      232.0K Nov 22 15:34 0000-total_cloud_water-gfs-1.0.json
-rw-r--r--    1 root     root      278.9K Nov 22 15:34 0000-total_precipitable_water-gfs-1.0.json
-rw-r--r--    1 root     root      568.9K Nov 22 15:34 0000-wind-surface-level-gfs-1.0.json

./weather/2016/11/23:
total 2104
-rw-r--r--    1 root     root      455.5K Nov 23 15:09 0000-mean_sea_level_pressure-gfs-1.0.json
-rw-r--r--    1 root     root      184.4K Nov 23 15:09 0000-relative_humidity-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      370.8K Nov 23 15:09 0000-temp-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      234.7K Nov 23 15:09 0000-total_cloud_water-gfs-1.0.json
-rw-r--r--    1 root     root      278.6K Nov 23 15:09 0000-total_precipitable_water-gfs-1.0.json
-rw-r--r--    1 root     root      568.9K Nov 23 15:09 0000-wind-surface-level-gfs-1.0.json

./weather/2016/11/24:
total 2108
-rw-r--r--    1 root     root      455.7K Nov 24 15:09 0000-mean_sea_level_pressure-gfs-1.0.json
-rw-r--r--    1 root     root      184.5K Nov 24 15:09 0000-relative_humidity-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      371.0K Nov 24 15:09 0000-temp-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      236.8K Nov 24 15:09 0000-total_cloud_water-gfs-1.0.json
-rw-r--r--    1 root     root      278.2K Nov 24 15:09 0000-total_precipitable_water-gfs-1.0.json
-rw-r--r--    1 root     root      569.2K Nov 24 15:09 0000-wind-surface-level-gfs-1.0.json

./weather/2016/11/25:
total 2112
-rw-r--r--    1 root     root      455.7K Nov 24 15:43 0000-mean_sea_level_pressure-gfs-1.0.json
-rw-r--r--    1 root     root      184.7K Nov 24 15:43 0000-relative_humidity-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      371.1K Nov 24 15:43 0000-temp-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      242.6K Nov 24 15:43 0000-total_cloud_water-gfs-1.0.json
-rw-r--r--    1 root     root      278.9K Nov 24 15:43 0000-total_precipitable_water-gfs-1.0.json
-rw-r--r--    1 root     root      570.5K Nov 24 15:43 0000-wind-surface-level-gfs-1.0.json

./weather/2016/11/26:
total 2116
-rw-r--r--    1 root     root      456.8K Nov 24 14:37 0000-mean_sea_level_pressure-gfs-1.0.json
-rw-r--r--    1 root     root      184.8K Nov 24 14:37 0000-relative_humidity-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      370.4K Nov 24 14:37 0000-temp-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      240.8K Nov 24 14:37 0000-total_cloud_water-gfs-1.0.json
-rw-r--r--    1 root     root      279.2K Nov 24 14:37 0000-total_precipitable_water-gfs-1.0.json
-rw-r--r--    1 root     root      570.0K Nov 24 14:37 0000-wind-surface-level-gfs-1.0.json

./weather/2016/11/27:
total 2036
-rw-r--r--    1 root     root      455.8K Nov 24 13:40 0000-mean_sea_level_pressure-gfs-1.0.json
-rw-r--r--    1 root     root      184.9K Nov 24 13:40 0000-relative_humidity-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      370.1K Nov 24 13:40 0000-temp-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      166.5K Nov 24 13:40 0000-total_cloud_water-gfs-1.0.json
-rw-r--r--    1 root     root      278.8K Nov 24 13:40 0000-total_precipitable_water-gfs-1.0.json
-rw-r--r--    1 root     root      570.3K Nov 24 13:40 0000-wind-surface-level-gfs-1.0.json

./weather/current:
total 2108
-rw-r--r--    1 root     root      455.7K Nov 24 15:09 current-mean_sea_level_pressure-gfs-1.0.json
-rw-r--r--    1 root     root      184.5K Nov 24 15:09 current-relative_humidity-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      371.0K Nov 24 15:09 current-temp-surface-level-gfs-1.0.json
-rw-r--r--    1 root     root      236.8K Nov 24 15:09 current-total_cloud_water-gfs-1.0.json
-rw-r--r--    1 root     root      278.2K Nov 24 15:09 current-total_precipitable_water-gfs-1.0.json
-rw-r--r--    1 root     root      569.2K Nov 24 15:09 current-wind-surface-level-gfs-1.0.json

Here is the output of ls -lRh in /mnt/downloads/Weather/grib2

ls -lRH
.:
total 24
drwxr-xr-x    2 root     root          4096 Nov 20 03:21 gfs.2016111900
drwxr-xr-x    2 root     root          4096 Nov 21 02:12 gfs.2016112000
drwxr-xr-x    2 root     root          4096 Nov 22 04:35 gfs.2016112100
drwxr-xr-x    2 root     root          4096 Nov 22 15:34 gfs.2016112200
drwxr-xr-x    2 root     root          4096 Nov 23 15:43 gfs.2016112300
drwxr-xr-x    2 root     root          4096 Nov 24 15:43 gfs.2016112400

./gfs.2016111900:
total 1380
-rw-rw-r--    1 postgres postgres    338472 Nov 20 01:05 gfs.t00z.pgrb2.1p00.f000.grib2
-rw-rw-r--    1 postgres postgres    344107 Nov 20 01:05 gfs.t00z.pgrb2.1p00.f024.grib2
-rw-rw-r--    1 postgres postgres    346861 Nov 20 01:05 gfs.t00z.pgrb2.1p00.f048.grib2
-rw-rw-r--    1 postgres postgres    373659 Nov 20 01:05 gfs.t00z.pgrb2.1p00.f072.grib2

./gfs.2016112000:
total 340
-rw-rw-r--    1 postgres postgres    347894 Nov 20 07:05 gfs.t00z.pgrb2.1p00.f048.grib2

./gfs.2016112100:
total 684
-rw-rw-r--    1 postgres postgres    348132 Nov 22 01:05 gfs.t00z.pgrb2.1p00.f048.grib2
-rw-rw-r--    1 postgres postgres    349038 Nov 22 01:05 gfs.t00z.pgrb2.1p00.f072.grib2

./gfs.2016112200:
total 0

./gfs.2016112300:
total 1356
-rw-rw-r--    1 postgres postgres    340897 Nov 23 13:05 gfs.t00z.pgrb2.1p00.f000.grib2
-rw-rw-r--    1 postgres postgres    347980 Nov 23 13:05 gfs.t00z.pgrb2.1p00.f024.grib2
-rw-rw-r--    1 postgres postgres    347302 Nov 23 13:05 gfs.t00z.pgrb2.1p00.f048.grib2
-rw-rw-r--    1 postgres postgres    347902 Nov 23 13:05 gfs.t00z.pgrb2.1p00.f072.grib2

./gfs.2016112400:
total 0

Dirk

[LeaseOnLife]

Here is the opencpn grib display of the file linked to in my post above.

[electronicmarin]

Originally Posted by Littlechay

Do you have a link for the antenna that you are using please? I'm busy moving countries at the moment but hope to have my workbench set up in a couple of weeks and I'd like to build a receiver for this service.

Secondly does anybody have more details of the contents of the GRIB file transmitted yet?

no link for the antenna since wee are building it from 0, I did not had time to put up a site yet... busy with work...
There are not anny kind of grib files yet on the outhernet, just nooa animated charts, the guys are working on an agreement and try to setup an automated service that will download the grib, compress and upload once a day on the outhernet...
This is not theire main concern at the moment... keep in mind that the space on the satellite costs and they have to raise money for keeping it alive...

[Littlechay]

Originally Posted by electronicmarin

no link for the antenna since wee are building it from 0, I did not had time to put up a site yet... busy with work...
There are not anny kind of grib files yet on the outhernet, just nooa animated charts, the guys are working on an agreement and try to setup an automated service that will download the grib, compress and upload once a day on the outhernet...
This is not theire main concern at the moment... keep in mind that the space on the satellite costs and they have to raise money for keeping it alive...

Thanks for your response. No problem I'll scout around for something or make something or something

See above ^^^^^ there are some GRIB files already online and it seems some GRIBs converted to JSON.

Very aware of satellite costs. Most of my life has been in satellite communications engineering; till I went sailing that is

[Littlechay]

Originally Posted by LeaseOnLife

Chris

I have mine running since a few days, not much in terms of grib files. What I am seeing in the 'library' is a bunch of *.json files, used by the outernet weather app. The weather app is using Cameron Beccario's earth.nullschool.net viewer. This viewer needs the weather data as .json files: Each .json file contains data for the whole earth, but is only one parameter like "wind" and only for one point in time. The forecast for the next day is a separate file, as is a different parameter like rain.

Dirk

Thanks Dirk,

I'll get into this in a couple of weeks.

My other half has gone and got herself a proper job in New Zealand (well a contract for a couple of years) so I have to go and drop the hook for a while to keep her company; at least for the cyclone season. Will probably have some time on my hands

[electronicmarin]

Originally Posted by Littlechay

Thanks for your response. No problem I'll scout around for something or make something or something

Very aware of satellite costs. Most of my life has been in satellite communications engineering; till I went sailing that is

sorry for my presumption, i did not realised that you're a tech microvawe guy, annyway is not a secret thing wee are tryng to do and no secretcy poolitics since is just a hobby prodject for us... wee have build like 20 quad helix antennas- copyed from the radiosondes vaisala's gps antennas and Inmarsat L band antennas (just opened one for 10 min to have a peek when the guy from the boat was not around, i don't feel like buy one and reverse engeneering it since it costs to much for me to thorw money on it) my friend is the microvawe guru so we first matched impedance on 50ohm and analised the signal wee are getting with it, now waiting for various amplifiers and saw filters to start build the preamplifier-saw-amplifier stages... the ideea is that if wee manage to have good enough signal to amplify and stay above the noise floor with a helix like inmarsat is here in taly can go annywere but right under the satellite... but there is no problem since even with a patch you can recive I think well enough... drop me line @ electronicmarine@tiscali it if you want have a chat/ exchange opinions ecc..

[Littlechay]

Originally Posted by electronicmarin

copyed from the radiosondes

Radiosondes..... good idea - I think I know a man who might be able to help.

I'll keep my eye on this and get back into it when I have my workbench running .