Ticket #165 (closed task: fixed)
Distance points "feature" in GAP... scoring modules
|Reported by:||ste||Owned by:||ste|
Description (last modified by ste) (diff)
- raised by Yoshiki:
"... question regarding scoring points. Please see the attched file (http://fs.fai.org/raw-attachment/ticket/165/task_result-Jname-stopoutland_2009-03-21_(20090321-2324).html). You can see the distance points of pilot id 8 and 57.
Their distances are same (40.4km) but the distance points are different, 924.3 and 921.4. 2.9 points difference.
Is the reason that the distance is rounded up?"
A "feature" ;-)
The distance score for a pilot comes from two things:
- a linear factor: distance_points_linear = dist / 2.0 / best_dist
"dist" here is the actual distance the pilot flew (not rounded).
- a distance difficulty factor: The distance difficulty array is created by looking at the distribution of distances along the course.
A distance difficulty factor is created for each 100m of the task. To find the correct factor for a pilot the distance he flew is rounded down to nearest 100m.
For ex. (in you case),
Avaliable distance points: 982.5 Best distance flown was 42.937 Distance difficulty array: 40.3km: 0.467836257309941 40.4km: 0,470175438596491 Pilot 57: flew 40.358km -> 982.5 * (40.358/2/42.937 + 0.467836257309941) = 921.4 Pilot 15: flew 40.390km -> 982.5 * (40.390/2/42.937 + 0.467836257309941) = 921.8 Pilot 8: flew 40.413km -> 982.5 * (40.413/2/42.937 + 0.470175438596491) = 924.3
Pilot 57 and 15 both end up with the same difficulty factor but get differenct linear factor, hence different distance score.
All three pilots is shown in the result-list with 40.4km since the result stylesheet (task_result.tkr.xsl) rounds the distance to nearest 100m.
It might be more correct to round the distance down the nearest 100m before calculating the linear factor.
Changed 8 years ago by ste
- Attachment task_result-Jname-stopoutland_2009-03-21_(20090321-2324).html added
- Owner changed from oyvellef to ste
- Status changed from new to assigned
- Description modified (diff)
Changed 8 years ago by lopezrafa@…
- Attachment MOD_task_result-Jname-stopoutland_2009-03-21_(20090321-2324).html added
- Status changed from assigned to closed
- Resolution set to fixed
- Milestone set to 1.2.13