Get Strava Activity polyline altitude

I am using the Get Activity ById endpoint from the Strava API whcih returns a ActivityDetail object.

I can decode the polyline but it only returns the lat and lng values for each vertex.

I decode using:

import polyline from '@mapbox/polyline';
import { LatLngExpression } from 'leaflet';

export const decodePolyline = (
 encodedString: string | undefined,
): LatLngExpression[] => {
 if (!encodedString) return [];
  const decoded = polyline.decode(encodedString);
  return decoded;
};

I would like to get the altitude in order to draw the elevation graph too. Is there a different API call available to retrieve this data?

If your interested the repo Imj workin in is here: https://github.com/loanburger/strava-react-app

Thanks!

I have found another solution to this problem and wanted to share the approach. There is a ActivityStream API which can be used. It takes in the activity Id and the stream type you want then returns a stream result with the types you want:

• time: An instance of TimeStream.
• distance: An instance of DistanceStream.
• latlng: An instance of LatLngStream.
• altitude: An instance of AltitudeStream.
• velocity_smooth: An instance of SmoothVelocityStream.
• heartrate: An instance of HeartrateStream.
• cadence: An instance of CadenceStream.
• watts: An instance of PowerStream.
• temp: An instance of TemperatureStream.
• moving: An instance of MovingStream.
• grade_smooth: An instance of SmoothGradeStream.

A sample response for example the distance stream would look like:

[{
  "type" : "distance",
  "data" : [ 2.9, 5.8, 8.5, 11.7, 15, 19, 23.2, 28, 32.8, 38.1, 43.8, 49.5 ],
  "series_type" : "distance",
  "original_size" : 12,
  "resolution" : "high"
}]

This basically gave me exactly what I was after.