var serviceURL = "//services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/2012_CA_NHTSA/FeatureServer/0";
var heatmapFeatureLayerOptions = {
                                   mode: FeatureLayer.MODE_SNAPSHOT
                                   infoTemplate: infoTemplate,
                                   outFields: ["id","name","Address" ]
                                  };
var heatmapFeatureLayer = new FeatureLayer(serviceURL, heatmapFeatureLayerOptions);
    var heatmapRenderer = new HeatmapRenderer();
    heatmapFeatureLayer.setRenderer(heatmapRenderer);
    map.addLayer(heatmapFeatureLayer);

var schoolGraphicLayer = new GraphicsLayer();
schoolGraphicLayer.id = 'SchoolGLayer';