Marine Weather Forecasting

[LeaseOnLife]

Barnakiel

1) Yes, wave-height is displayed, more specific the HTSGW parameter: "Significant Height of Combined Wind Waves and Swell". Opencpn 1.3.6 does not display swell, separate from wind waves or any data about wavelength. If you get your grib data from via airmail/sailmail and you have selected the wave paramater with the GFS model, airmail sailmail will merge HTSGW from the WW3 model into the GFS model and you have wind, wind direction, waves in one file. I also select rain, but that is not being shown by opencpn.

2) No, opencpn 1.3.6 does not do weather routing. As for feature requests: Unfortunately the process for selection of feature requests seems to be outside of any public forum and nobody seems to know what is in the pipe for development.

[barnakiel]

LeaseOnLife - THX!

[idpnd]

Originally Posted by barnakiel

Hi,

1) If wave data is available in a grib file, will OpenCPN display it?

2) Will weather routing function be part of OpenCPN (alike it is done in MaxSea), and, if so, will it use the wave data (to avoid or take advantage of specific wave conditions)?

b.

1) Nope

2) Implementation not planned but desirable. There are a few implementations around, e.g. zezo.org

[LeaseOnLife]

idpnd, please have a look:

[Chuck D.]

Use of wave data in WX routing is an awfully tricky issue ... under sail, it always seems that one tack is favored over another and vessel polars (a req'd input to do routing) don't typically capture wave effects.

[idpnd]

@Lease - Got that wrong sorry. Btw you may enter or check feature requests at sourceforge.

[sinbad7]

Hi all..

Here is a VERY interesting as well as educational link on Oceanography and more.

MetEd Home Page

[cagney]

I'm thinking of automating, georeferencing of some OPC fcst maps. Quite useful, I think. Has anyone else looked into this?

Thomas

[bvimatelot]

I wrote a new thread about a View Fax problem I had but perhaps I should have written it here?

anyway - whenever I try to obtain data I get a message saying "cannot allocate socket" Can anyone tell me what it means or how to fix it? Thanks, Tony

[cagney]

The georeferenced forecast becomes real usefull when combined with a gribfile for the same time.
If the two files agree, and both agrees with your present observations, you have a confirmation of the grib, and can have higher confidence in the intermediate time steps available.
It is also a good tool to study and learn meteorology.

bvimatelot, you have to elaborate a wee bit more, I'm not a mindreader.

Thomas

[idpnd]

Originally Posted by cagney

The georeferenced forecast becomes real useful when combined with a gribfile for the same time.

Looks super useful! I wonder why zygrib hasn't implemented these, you can get an NOAA IAC fleetcode for the North Atlantic though..

[bvimatelot]

Originally Posted by cagney

.

.....bvimatelot, you have to elaborate a wee bit more, I'm not a mindreader.

Thomas

Ah.....OK, thanks!! I'll send you a pm! Tony

[cagney]

Here is a script for linux that automatically creates .kap files for use with OpenCPN. For now, it creates current surface analysis charts for E and W North Atlantic, as well as 48 and 96 hours surface, 500mb and wind/wave forecast charts for the N Atlantic.
Unzip it in a suitable new directory , run the shell script and point OpenCPN's chart manager to this directory.
Dependencies are: wget, libbsb and ImageMagic.
It can easily be expanded/adjusted to other sources.
Strip the .doc before proceeding.
This script should be easy to port to Win......!

Thomas

[nohal]

Originally Posted by cagney

Here is a script for linux that automatically creates .kap files for use with OpenCPN.

Thomas, thanks a lot, really cool!
I added a bit of automation, so everybody (even the poor Windoze users) can download the freshest charts at http://opencpn.xtr.cz/

Pavel

[ggarrouste]

Originally Posted by barnakiel

Overlays (layers):
- wind, waves, rain, pressure, water temp, air temp

A spot meteogram nice. A 'following the course/time, multi spot' one I would simply LOVE!

b.

I support the suggestion from Barnakiel about a kind of correlation between a route and grib files.
What I would like to get : select for display in the most recent grib file the view which matches the date/time for the active waypoint.
I have search this forum unsuccessfully for this feature.

Thanks to all for this excellent forum !
Gilles.