Method baseLayerSource

modules/core/ImagerySystem.js:377–407

*

(source)

   *
   */
  baseLayerSource(source) {
    if (!arguments.length) return this._baseLayer;

    // test source against OSM imagery blocklists..
    const osm = this.context.services.osm;
    if (!osm) return this;

    const blocklists = osm?.imageryBlocklists ?? [];
    const template = source.template;
    let fail = false;
    let tested = 0;
    let regex;

    for (regex of blocklists) {
      fail = regex.test(template);
      tested++;
      if (fail) break;
    }

    // ensure at least one test was run.
    if (!tested) {
      regex = /.*\.google(apis)?\..*\/(vt|kh)[\?\/].*([xyz]=.*){3}.*/;
      fail = regex.test(template);
    }

    this._baseLayer = (!fail ? source : this.getSourceByID('none'));

    this._imageryChanged();
    this.emit('imagerychange');
    return this;
  }


  /**