# GAP 2007 ?

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• #17
Eduardo
Participant

<p>The combination of leading points + arrival time points gives interesting results.</p>
<p>Leading points almost equal time points, and arrival points are also very high.<br />
Time points are low compared to other formulas
</p>

#207
ste
Member

Arrival time points is something that originally was used in OzGAP2005.
There it is not used in combination with Leading points.
OzGAP2005 use
– Distance points
– Time points
– Arrival time points

In GAP2007 one has the option to combine the two (as well as a other combinations of … points).

Hover the mouse over the scoring params part of the task window and a descr. on how to achieve the various GAP versions should pop up.

The points set aside for arrival should be the same regardless of selecting “Arrival position points” or “Arrival time points”.
The only difference is how they are handed out.

Here is the actual code for “Arrival time points”:
```x = Math.Round( Math.Pow( 1 + (2.0 / 3.0) * (sp.First_finish_time.Utc_time - p.Result.Finished_ss.Utc_time).TotalHours , 3) , 4, MidpointRounding.AwayFromZero); if (x < 0) x = 0; arrival_points = x * sp.Available_points_arrival;```

and this is for “Arrival position points”:
```x = 1 - (p.Result.Finished_ss_rank - 1.0) / sp.No_of_pilots_reaching_ES; x = 0.2 + 0.037 * x + 0.13 * Math.Pow(x, 2) + 0.633 * Math.Pow(x, 3); arrival_points = x * sp.Available_points_arrival;```

Stein-Tore

#221
danielvelez
Participant

Hello Ste.

I really like the configurability of GAP formula parameters within FS but this actually can lead to mistakes made by the score keeper, as you could probably end up making some combinations on parameters that leads to a brand new scoring formula.

In order to avoid this, or perhaps to bring more clarity or user friendly interfase, it would be really good to have a selection field on which you could just select GAP 2000, GAP 2002, GAP 2002 + Lead.Coef. and OZGAP2005, so this way you won´t have to be hovering with the mouse waiting for the parameters and then rechecking them with your selections. Just select the intended gap and you will get all the parameters right.

Perhaps, in order to keep the usability, you could have another element on the list that´s called USER GAP, that when selected, all the parameters became available for select or remove.

Daniel Velez

#222
ste
Member

In FS 1.2.x there will be simplified scoring formulas pretty much as you suggest.

Have located the bug in 1.2.1 now and will have a fix on monday.

Anyhow if you start FS 1.2.1 you will see that you can select GAP2007 and PWC2007.
Here there will be more selections.

Stein-Tore

#223
ste
Member

FS 1.2.1 is now fixed and should work with checking tracklogs too.

Stein-Tore

#232
ste
Member

FS 1.2.2 (just released) has GAP2000, GAP2002, OZGAP2005, GAP2007 (as before), and PWC2007 scoring formulas.

Using GAP2007, the fsdb file will be backwards compatible with FS 1.1.x.

Using any of the other formulas, one need to edit the fsdb file manually in order to open the task from FS 1.1.x as FS 1.1.x does not know of any other formula id than “GAP2007”.

Stein-Tore

#304
fredrik
Participant

I believe that fs don’t work properly when using arrival time points together with leading points in the same way as the opening post seems to suggest.

Here are some recent results from Australia
http://www.triptera.com.au/canungra/classic2008/open_day_5.htm

and ozreport discussion. Mostly relevant on page 3 and 4.
http://ozreport.com/forum/viewtopic.php?t=13797&postdays=0&postorder=asc&start=0

It seems like you get to many max lead and arrival points compared to GAP2002 and your first response in this thread seems to suggest that you should get the same max points as you get in GAP2002 also using these parameters.

#305
fredrik
Participant

Now I see that the nordic 2007 and NC 2007 was scored with leading points and arrival time points. NC 2008 is scored with time position points.

Is it possibly to find any information anywhere about how the points are allocated for all different methods that is possibly to use in GAP2007?

My guess is that the distance points are determined by the plot in the gap2002 document. The maximum arrival points is then determined differently if arrival position points or arrival time points are used. 1/8 of the points except the distance points are arrival points if arrival position points are used and 1/4 of the points except the distance points are arrival points if arrival time points are used.
The leading/departure points are then 1.4 times the arrival points. The time points are the rest of the points.

So you get twice as many arrival points and leading points if arrival time points are used compared to if arrival position points are used.

The difference in the result of the comp might not be that large if it was a race to goal but could be a large difference if start gates are used.

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