GPXIN-1: Acceleration/Deceleration Stats

Acceleration = (final velocity - initial velocity) / time
Deceleration = (initial velocity - final velocity) / time

So should be reasonably easy to add a calculation;

|time (seconds)|speed (metres/sec)|Acceleration|Deceleration|
|0|0| | |
|10|50||5 m/s^2 | |
|15|65||3 m/s^2 | |
|25|50| ||1.5 m/s^2|
|30|40| ||2 m/s^2|
|0|0| ||4 m/s^2|

As the SI for acceleration is metres a second (squared), we'll need to convert speeds from MPH/KPH

Created feature branch GPXIN-1-Accel-Stats

Track stats will be pushed to object arrays

- faccel
- fdecel

Journey stats will be pushed to

- accels
- decels

Acceleration and deceleration will not be included if speeds are suppressed.

The following stats will be available at Journey and Track levels (support for segments not being implemented at this time)

- Max acceleration
- Max deceleration
- Min acceleration
- Min deceleration
- Average acceleration
- Average deceleration

Formula check -

KPH to metres/s

$metres_speed = ($kph_speed * 1000)/3600;

(10 kph * 1000) = 10000kph / 3600 = 2.7778 m/s


MPH to metres/s (1609.344 metres to mile)

$metres_speed = ($mph_speed * 1609.344)/3600;

(10 mph * 1609.344) = 16093.44 / 3600 = 4.4704 m/s


Figures confirmed using online calculator

Implemented and tested. Commit be95a55 refers.

Will merge changes and close feature branch

Reopening to allow assignment to version 1.02