function init(): void {
  let overlays: OverlayState = OverlayState.load() ?? new OverlayState(); 
  const map = L.map('map').setView([35.6653, -105.9507], 13);

  const streetLayer = TileLayerWrapper.constructLayer(
    "streetLayer",
    L.tileLayer(
      'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
      {
        maxZoom: 19,
        attribution: "street map tiles © OpenStreetMap"
      }));
      
  const satelliteLayer = TileLayerWrapper.constructLayer(
    "satelliteLayer",
    L.tileLayer(
      'https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}',
      {
        maxZoom: 19,
        attribution: "satellite tiles © Esri"
      }));
      
  TileLayerWrapper.enableOnly("streetLayer", map);
  
  overlays.markers.forEach(m=>m.add(map));
  overlays.circles.forEach(m=>m.add(map));
  overlays.polygons.forEach(m=>m.add(map));
  const createOverlayModal = new CreateOverlayModal();
  const modals = new ModalCollection(
    createOverlayModal);

  MapHandler.init(map, overlays, TileLayerWrapper.layers, modals);
  
  MapHandler.setButtonClick("addPoint-btn", MapHandler.markerCollect);
  MapHandler.setButtonClick("addCircle-btn", MapHandler.circleCollect);
  
  MapHandler.setButtonClick("save-btn", MapHandler.overlaySave);
  MapHandler.setButtonClick("clear-btn", MapHandler.overlayClear);
  
  MapHandler.setButtonClick("tiles-btn", MapHandler.swapTiles);
}

init();