Classifying Types of Climbing (Walking, Lift Access, etc.)

Feature Requests
1

For Adventure / Bikepacking / Enduro / DH athletes, it would be very helpful to know how much time was spent walking the bike uphill vs. riding uphill vs. taking a chairlift up.

Some ideas to compute this:

  • Walking uphill can be estimated by observing a cadence of 0, while uphill progress is made past a certain distance (say 1000 ft etc.), and a certain speed window (say 0-10kph)
  • Lift access can be calculated by using the GPS data, Cadence of 0 for prolonged period of time ( say >1 min) and a VAM threshold greater than a certain amount.

Not sure how to approach this for walking the bike on flat terrain, but that would be another aspect in addition to walking while going uphill.

2

You could try create custom activity fields to compute these things. This one calculates “Hike ascent time” (total time doing power hike in trail run):

{
  let time = icu.streams.time
  let alt = icu.streams.fixed_altitude
  let cadence = icu.streams.cadence
  // https://forum.intervals.icu/t/elevation-gain-off/8463/16
  let threshold = 1.2
  let totSecs = 0.0
  let prev = 0
  let maxDeltaTime = activity.icu_median_time_delta ? activity.icu_median_time_delta * 2 : 0
  if (maxDeltaTime < 30) maxDeltaTime = 30
  let prevAlt = alt[0]
  let prevTime = 0
  for (let i = 1; i < alt.length - 1; i++) {
    let t = time[i]
    if (t == null) continue
    let deltaTime = t - prev
    if (deltaTime <= maxDeltaTime) {
      let v = alt[i]
      if (v != null) {
        if (prevAlt != null) {
          let delta = v - prevAlt
          if (Math.abs(delta) >= threshold) {
            if (delta > 0.0 && cadence[i] <= 69) totSecs += t - prevTime
            prevAlt = v
            prevTime = t
          }
        } else {
          prevAlt = v
        }
      }
    } else {
      prevAlt = alt[i]
      prevTime = t
    }
    prev = t
  }
  totSecs
}
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