code: function addFeaturePicking(terria, initSources) {
    if (
      defined(terria.pickedFeatures) &&
      terria.pickedFeatures.features.length > 0
    ) {
      const positionInRadians = Ellipsoid.WGS84.cartesianToCartographic(
        terria.pickedFeatures.pickPosition
      );
  
      const pickedFeatures = {
        providerCoords: terria.pickedFeatures.providerCoords,
        pickCoords: {
          lat: CesiumMath.toDegrees(positionInRadians.latitude),
          lng: CesiumMath.toDegrees(positionInRadians.longitude),
          height: positionInRadians.height
        }
      };
  
      if (defined(terria.selectedFeature)) {
        // Sometimes features have stable ids and sometimes they're randomly generated every time, so include both
        // id and name as a fallback.
        pickedFeatures.current = {
          name: terria.selectedFeature.name,
          hash: hashEntity(terria.selectedFeature, terria.clock)
        };
      }
  
      // Remember the ids of vector features only, the raster ones we can reconstruct from providerCoords.
      pickedFeatures.entities = terria.pickedFeatures.features
        .filter(feature => !defined(feature.imageryLayer))
        .map(entity => {
          return {
            name: entity.name,
            hash: hashEntity(entity, terria.clock)
          };
        });
  
      initSources.push({
        pickedFeatures: pickedFeatures
      });
    }
  }
docs: Add details of currently picked features.
  @private