Zezo forum:

Post by nsp | 2017-12-13 | 12:11:16

I just saw some weird stuff in + 18hours in zezo. there's significant diferences in wind direction As an example 46� 17,8 S 43� 56,2 E.

Something that is out of control, or it results from the new charts versus old interpolation?

11 Comments

Post by nsp | 2017-12-13 | 12:12:23

Differences of 15�TWD and also in TWS
What i mean is differences between the values in the projected route and the ones in the area at that exact moment.

Post by zezo | 2017-12-13 | 12:27:49

Please check in 5 minutes.

Post by nsp | 2017-12-13 | 12:56:49

Differences increased:
35� TWD
9 knts TWS

Impossible to do the projected route

Post by zezo | 2017-12-13 | 13:11:48

The wind data in the chart (numbers at the cursor) is not interpolated, so it's only exact at 3-hour intervals - on the dark isochrones and exactly between them. For every other black dot you'll see a difference because the router interpolates the wind and the user interface does not.

But the track tool does too, so it generally matches the server-side track.

I should fix it and save me a ton of time answering this question, same probably goes for the VR interpolation method.

Post by nsp | 2017-12-13 | 13:11:23

i saw your answer in the other thread :)

but it increased..

I understand what is interplation Cvetan, but when zezo "designs" a rooute it has into consideration the interpotated data,

sooooooooo...the numbers should be the same in the chart and in the boxes of the several points of your route. the point in my route at 18 hours has a diference of 35� in twd related to the chart.And also 9knts in TWS. so intead of being there at 135 I will be at 100 twa which means that all route could be wrong in this moment.

And it's the first time i see this kind of difference.

Post by zezo | 2017-12-13 | 13:23:04

There are no differences in stable wind field, like the trade winds in Leg 2 for example. With a rapidly moving and developing low pressure system you can expect to see huge differences between subsequent GFS outputs (and between weather conditions 3 hours apart)

Similar for the center of a high-pressure system where the wind direction will vary wildly (speed has lower bound of 4kts, as we know)

Post by MichelleWhy | 2017-12-13 | 13:12:23

I'm a bit lost now. The router showing GFS:6z just now and an hour too early?!

Post by zezo | 2017-12-13 | 13:16:39

GFS 6Z is ready at 11Z. See this http://zezo.org/forum.pl?tid=6109

6Z is the moment of the starting conditions snapshot/start of the run, then it takes 5 hours to crunch the numbers. There are several explanations in the forum.

Post by MichelleWhy | 2017-12-13 | 13:24:19

Must be tired of reading all this stuff with the wrong data, sorry Cvetan. It confused me quite a lot. I was sure the update was 12z. Thanks for the clarification.

Post by zezo | 2017-12-13 | 14:53:32

It's partially my own fault. I should probably get everything in sync and minimize the number of support calls, but:

- I have to divide my time between real life and the game. And then in the game between router development, all kind of non-router tech support and political discussions.

- As I just explained in another topic, I can only get the winds in sync with the official VR client, not with the VR server. And there is visible difference between those two at times, with the server being closer to the router than to the client. Which will still raise support questions because I can't match two sets of data simultaneously.