ElevationProfile Widget

const elevationProfile = new ElevationProfile({
  view: view,
  profiles: [{
    type: "ground" // first profile line samples the ground elevation
  }, {
    type: "view" // second profile line samples the view and shows building profiles
  }],
  // hide the select button
  // this button can be displayed when there are polylines in the
  // scene to select and display the elevation profile for
  visibleElements: {
    selectButton: false
  }
});