Facebook

Login

Support Sailonline

If you haven't already - join the SAILONLINE YACHT CLUB!

Please also consider making a donation - all amounts are greatly appreciated!

Board » Technical Support » qtVlm thread

Page: First Previous 6 7 8 9 10 11 12 Next Last

Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2016-11-29 08:52:01 - qT barriers problem.
Viva all.

Since some time I have this issue concerning the use of barriers.

The qT I'm using is the version 5.4-3 Nov 1.2016.

Now the issue (pls see also the attached PDF file).

1 - I've open a Grib file for the West Atlantic.

2 - Created a new barrier in the China Sea.

3 - When I zoom to all the Grib's grid space I get two horizontal lines that come from the China Sea created barrier!?

4 - If I want to make a routing N-S in the Atlantic intersecting the Latitudes of those two horizontal lines, I just can't,

5 - unless I clean that barrier.

I would like to know if:

A - This is a problem?
B - The rest of the qT users have the same issue (assuming it is one)?

Thank you.
Sail Fair.
Attachments
Posted by
maitai


Users avatar

Posts
114
Registered at
2016-02-25 08:15:33
2016-11-29 20:10:51 - Re: qtVlm thread
Can you send me your poiReal.dat please (I guess this is already corrected but just to check)

--- Dernière modification par maitai le 2016-11-30 07:58:14 ---
Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2016-11-30 08:58:36 - Re: qtVlm thread
Viva Philippe,

Good morning.

I’ll send you the requested file (“poiReal.dat”) but mind you that, meanwhile, I had to remove the Sea China barrier so I could perform the Atlantic routings. Otherwise it was impossible to do it, unless changing the routing option for “Avoid barriers”, which is not an option if we really need “barriers” to be active.

Even now, that I’m making a routing for the X2X race, the polylines from other barriers are generating outside the actual Grib Grid horizontal barrier lines on other areas of the globe.

Thank you & BH
João
Sail Fair.
Posted by
maitai


Users avatar

Posts
114
Registered at
2016-02-25 08:15:33
2016-11-30 09:43:53 - Re: qtVlm thread
Thanks for the report João
That's fixed and will be in the next release, due very soon, probably today.
Posted by
maitai


Users avatar

Posts
114
Registered at
2016-02-25 08:15:33
2016-11-30 22:12:02 - Re: qtVlm thread
5.4.4-beta1 out on VW (http://www.virtual-winds.org/forum/index.php?/topic/7575-qtvlm/&do=findComment&comment=271697).

Please take your chance to complain/report/suggest before official release ;)
Posted by
Bimmer


Users avatar

Posts
447
Registered at
2015-02-23 15:38:27
2016-12-10 06:52:28 - Re: qtVlm thread
Hey Phillippe
When I draw a heading, the numbers are so small that I can't read them.
Is there a way to enlarge them?
Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2016-12-14 15:34:25 - Re: qtVlm thread
Confusion when increasing TWS Wind Grib.

Viva Philippe.

Good afternoon.

In the qT tab “Advanced settings” tab included in the “Routing settings” menu, there is an option to increase the Wind speed by a percentage that you specify - pls see also attached PDF file.

Made a first test routing with no increase (100%) in the Wind speed and got the first route (blue path).
After, I’ve made a second test routing the Wind speed increased by 15% (115%) and got a second and different route from the first one (purple path).

But what puzzled me was the info I’ve got from qT before the second routing became the second route:

“This routing has been calculated with an assumption modifying grib data”, (so far so good).

The problem came after when, in the same info window had this:

“The route will not take this scenario into account.
Are you sure you want to convert to route?”!?

Well, the two routings were made from the same start and finish marks, starting exactly at the same time. The only different was a15% increase in the TWS for the second routing.
Anyhow, I’ve got two different routes.

The question.

If, as said in the info window that: “The route will not take this scenario into account.”, how and why do we obtain two different routes?

Does it really takes, or not, the effect on the routing and corresponding route the TWS increase?

Thank you and
a BH.

João/psail
Sail Fair.
Attachments
Posted by
maitai


Users avatar

Posts
114
Registered at
2016-02-25 08:15:33
2016-12-14 17:07:36 - Re: qtVlm thread
The what-if mechanism only applies to routings, not routes. So once converted in a route you loose them.

You get 2 differents routes because although the route ignore this setting the routing founds other points, of course. So the 2 routes are different, but they are using the same wind.

There is another way to achieve what you want:

In configuration->grib, you can specify a global correction on wind (TWS). Run a routing with this modification, convert it in a route etc, and then FREEZE the route. Then you can reset this setting (or change it) and do a routing->route again, and compare the routes.

Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2016-12-14 17:33:25 - Re: qtVlm thread
Viva Philippe.

Haha, thank you for this good tip (“TWS correction”).

This was precisely what I needed.

BH

João/psail
Sail Fair.
Posted by
DirtyRat1402


Users avatar

Posts
4
Registered at
2015-07-01 09:40:49
2016-12-16 06:13:02 - Grib2 Variables: PRES loads but PRMSL does not
I've directly downloaded some grib2 files from the NOMADS server which include pressure. One uses PRES variable and the other uses PRMSL. Only the PRES one will render the pressure information. I'd prefer to use the PRMSL version if we can get it to work. I've attached the PRMSL grib file for testing.
Attachments

Page: First Previous 6 7 8 9 10 11 12 Next Last

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

Tasman Double 2025 - Hobart to Sydney

With Hobart astern and celebrations behind them, the fleet turns north for Leg 2 of our Tasman Double Series. Over 625 nautical miles, our SOLers aboard their mighty Super Maxi 100v2s return to the Tasman Sea, where shifting weather, demanding seas, and nonstop decisions shape every mile. The race back to Sydney rewards those who read the conditions best, manage their speed wisely, and stay focused until the final approach.
Race #2000
INFO by brainaid.de
Super Maxi 100v2 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: TD - SYC
Race starts: Jan 02nd 02:00 Registration Open!
▶ Flash
GO TO RACE

Cape Town to Rio 2026

Welcome to South Africa and RCYC's classic transatlantic Cape2Rio Race from Cape Town, South Africa, to Rio de Janeiro, Brazil. First run in 1971, this run is buddied with the IRL, Cape2Rio 2025 arranged by the Royal Cape Yacht Club with the cooperation of the
Iate Clube do Rio de Janeiro Despite this being announced the 2025 race (starting dec. 27) it is the 2026 SOL championship kickoff. This virtual version, will be raced once again in Mark Mills' 74ft speedster, the stunning C2R74.
Race #1996 INFO
by brainaid.de
C2R74 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
OCQ1 - OCCH - SUPBUD - SYC
Race starts: Dec 27th 12:00 Registration Open!

▶ Flash
GO TO RACE

ORCV Melbourne to Hobart 2025

Welcome to the legendary Westcoaster, a true test of endurance and seamanship that’s challenged sailors for over 50 years! Spanning 435 nautical miles, this iconic race takes the fleet from Melbourne, across the wild Bass Strait, and around Tasmania’s rugged west coast to Hobart. Organized by the Ocean Racing Club of Victoria, this year our SOLers will be racing the sleek and powerful Dehler 46—a fast, elegant regatta cruiser built for both speed and adventure. Get ready for an unforgettable offshore classic!
Race #1952
INFO by brainaid.de
Dehler 46 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
Race starts: Dec 27th 02:30 Registration Open!
▶ Flash
GO TO RACE

Tasman Double 2025 - Sydney to Hobart

Christmas in Summer? Indeed! Kick off the first leg of our two-leg Tasman Double series in the classic 625nm Sydney to Hobart race, this year in the upgraded SuperMaxi 100v2. Inspired by Neville Crichton’s legendary Alfa Romeo II and her near-sister Wild Oats XI, these yachts blaze across online and real-world waters alike. Feel the thrill even in storm-force winds as you tackle the Tasman Sea—dock in Hobart victorious, or at least in time for a well-earned post-Christmas drink!
Race #1953
INFO by brainaid.de
Super Maxi 100v2 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: TD - SYC
Race starts: Dec 26th 02:00 Registration Open!
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member KaSToR
  2. Sailonline Yacht Club Member WRmirekd
  3. Sailonline Yacht Club Member CriticalHippo
  4. Sailonline Yacht Club Member rafa
  5. Sailonline Yacht Club Member bonknhoot
  6. Sailonline Yacht Club Member vida
  7. Sailonline Yacht Club Member CollegeFund
  8. Sailonline Yacht Club Member Sax747
  9. Sailonline Yacht Club Member sassy63
  10. Sailonline Yacht Club Member Adlaem

View full list

Series

Mobile Client

SYC members have the benefit of access to our mobile/lightweight web client!

The mobile client