Weather routing - how to get it right?

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Weather routing - how to get it right?

Postby tlew » Tue Dec 13, 2011 5:39 pm

I use VR-tool, and everything is working perfectly, except one thing:
The date/time of the "WR-best" tracks are offset with several hours.

I expect date/time for the first point to match the time when I generated the WR-best track, but it is always offset by several hours (last time I checked it was offset by exactly +7 hours).

I have no idea how to get it right, so I am hoping for some suggestions.
Perhaps I have missed some important settings. But apart from putting in my time zone when importing GRIB-data, I have no idea what to do.

Anyway, thanks in advance for all advice I can get on this issue.
tlew
 
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Re: Weather routing - how to get it right?

Postby tlew » Wed Dec 14, 2011 4:45 pm

I think I have got it to work now.
I missed the "track designer settings". So now I've selected "windgrid timestamp + a time zone".
The points will show the UTC time, but that is ok for me.

Anyway, thanks for an excellent software!
tlew
 
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Re: Weather routing - how to get it right?

Postby mclean » Thu Dec 15, 2011 7:57 am

tlew wrote:So now I've selected "windgrid timestamp + a time zone".
The points will show the UTC time, but that is ok for me.


After you set the "New track start" check that the displayed "Forecast Age" is correct. It should show the elapsed time since the last wind update. This verifies that the tracks will align correctly with the weather grids.
The marks on the tracks are not the time - they indicate where you are on the weather grid. For example between the "0hr" and "12hr" marks the track is using the 0h weather grid. At the "12hr" mark it switches to the 12h weather grid, and so on.
To see the weather at any point along the track go to the toolbar and display the weather grid indicated by the mark.
The same applies when you lay a track manually and mark it.
That's as I understand it.
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Re: Weather routing - how to get it right?

Postby tlew » Thu Dec 15, 2011 1:44 pm

The time I refer to is not on the map. You'll find the time when you check the details for the track in the properties panel
-> tracks - (select a track in the list)
- open the "point" -tab
and there you see details for all points, including the date/time. You will also see what forecast is used (0h, 12h, etc).

And as you mention, it is important to check that the forecast age is correct. With "windgrid timestamp + timezone" it is.
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Re: Weather routing - how to get it right?

Postby omar » Thu Dec 15, 2011 9:09 pm

There is a post about WR parameters in thread:
http://www.tecepe.com.br/phpbb3/viewtopic.php?f=2&t=1362
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