bagaimana cara memanggil variable di type script

permisi saya masih awam di oop ,, saya mempunyai variable lat di loadmap(),, bagaimana cara memanggil nya di di cal()

 export class Ambulan {
	@ViewChild('map') mapElement: ElementRef;
	map: any;
	lat: any;
	lng: any;
	private baseURI               : string  = "http://localhost/api-medcall/";
  constructor(public navCtrl: NavController, public navParams: NavParams,
              public geolocation: Geolocation,
			  public http: Http,
              public toastCtrl  : ToastController) {
  }

  ionViewDidLoad() {
   this.loadMap();
  }

  loadMap(){{
    this.geolocation.getCurrentPosition().then((position) => {
		let  lat = position.coords.latitude;
		let  lng = position.coords.longitude;

	this.lat = lat;
    let usersLocation = {
      lat: position.coords.latitude,
      lng: position.coords.longitude
    };

      let latLng = new google.maps.LatLng(usersLocation);

      let mapOptions = {
        center: latLng,
        zoom: 15,
        mapTypeId: google.maps.MapTypeId.ROADMAP
      }

      this.map = new google.maps.Map(this.mapElement.nativeElement, mapOptions);
	  //this.call(lat, lng);

    }, (err) => {
      console.log(err);
    });
	  }
	 }

	 addMarker(){

	  let marker = new google.maps.Marker({
		map: this.map,
		animation: google.maps.Animation.DROP,
		position: this.map.getCenter()
	  });

	  let content = "<h4>Information!</h4>";

	  this.addInfoWindow(marker, content);

	}

	addInfoWindow(marker, content){

	  let infoWindow = new google.maps.InfoWindow({
		content: content
	  });

	  google.maps.event.addListener(marker, 'click', () => {
		infoWindow.open(this.map, marker);
	  });

	}

	cal(){

	}
}