Slope, smoothing & attributions

Slope classes

With slope: true, the profile is split into contiguous portions of the same slope class (width slopeClassSize, in %), capped at maxClasses (default 8). Colours run from blue (flattest class) to red (steepest), via cyan/green and a pure yellow, spread across the classes that are actually present — not stretched on the real maximum slope. A vertical separator marks each class change, and a legend appears under the title.

new OlElevationProfile({ slope: true, slopeClassSize: 2.5, maxClasses: 8 })

Smoothing

smoothing is a sliding-window average over metres of track (0 = none). Because the unit is metric, the result is independent of GPS point density. Smoothing softens both the profile and the slope.

profile.setOptions({ smoothing: 60 }) // average over ±30 m

Attributions

When the profile sits in the bottom-right corner (or full-width at the bottom), the OpenLayers attribution control is automatically lifted above the profile, right-aligned, with a vertical gap equal to the map-edge-to-profile-bottom gap. Other placements leave the attribution untouched.

Time

If the source track carries time data — coordTimes (ISO timestamps, from GPX <time>), coordinateProperties.times, or a 4th M coordinate — two opt-in items become available:

• add 'duration' to headerItems to show the total elapsed time in the title line;
• add 'time' to tooltipItems to show the elapsed time at the cursor point.

The unit adapts to the value: 7 sec, 26 min, 1 h 48 min, 2 j 3 h (days + hours). By default the time is moving time: stopped segments (speed below stopSpeed, 0.5 m/s) are excluded; set ignoreStops: false for raw wall-clock time. Under an A↔B crop, the time is rebased so it restarts at 0 on A. Use OlElevationProfile.featureHasTime(feature) to detect whether a track has time data.

new OlElevationProfile({
  headerItems: ['distance', 'ascent', 'descent', 'minmax', 'duration'],
  tooltipItems: ['distance', 'elevation', 'time']
})