How to calculate the speed ?

[LouisJeudy]

Hello,

How to calculate the speed (max, in), the average speed ? I can't find any method for.

Thanks in advance

[Luuka]

Hello !

Calculate the speed metadata from the GPXParser object is quite easy. I think it will be part of a future release.

For now you can calculate it from the existing data :
As the speed is just the result of the operation distance/time you can calculate it by yourself for each sub segment (ie. between each GPX points)

• The time is just the time difference between the two points
• The distance is the difference between the cumulative distance of the two points

So for each points :

let distance = track.distance.cumul[i+1] - track.distance.cumul[i]; // in meters
let time = track.points[i+1].time - track.points[i].time; // in milliseconds
let speed = distance/time;  //in meters per milliseconds

So you could convert it to km/h by multiplicating by 3600.