code: function (imagerySet, bingMapsKey) {
              var wwBingMapsKey = "AkttWCS8p6qzxvx5RH3qUcCPgwG9nRJ7IwlpFGb14B0rBorB5DvmXr2Y_eCUNIxH";
  
              // Use key specified for this layer
              this.bingMapsKey = bingMapsKey;
  
              // If none, fallback to key specified globally
              if (!this.bingMapsKey) {
                  this.bingMapsKey = WorldWind.BingMapsKey;
              }
  
              // If none, fallback to default demo key
              if (!this.bingMapsKey) {
                  this.bingMapsKey = wwBingMapsKey;
              }
              
              // If using WorldWind Bing Maps demo key, show warning
              if (this.bingMapsKey === wwBingMapsKey) {
                  BingImageryUrlBuilder.showBingMapsKeyWarning();
              }
  
              this.imagerySet = imagerySet;
          }
docs: Constructs a URL builder for Bing imagery.
  @alias BingImageryUrlBuilder
  @constructor
  @classdesc Provides a factory to create URLs for Bing image requests.
  @param {String} imagerySet The name of the imagery set to display.
  @param {String} bingMapsKey The Bing Maps key to use for the image requests. If null or undefined, the key at
  [WorldWind.BingMapsKey]{@link WorldWind#BingMapsKey} is used. If that is null or undefined, the default
  WorldWind Bing Maps key is used,
  but this fallback is provided only for non-production use. If you are using Web WorldWind in an app or a
  web page, you must obtain your own key from the
  [Bing Maps Portal]{@link https://www.microsoft.com/maps/choose-your-bing-maps-API.aspx}
  and either pass it as a parameter to this constructor or specify it as the property
  [WorldWind.BingMapsKey]{@link WorldWind#BingMapsKey}.