art_lat = e.lngLat.lat;
    start_lon = e.lngLat.lng;
    if (startMarker) {
      startMarker.remove();
    }
    startMarker = new mapboxgl.Marker({ "color": "#23da2c", "draggable": "true" })
      .setLngLat([start_lon, start_lat])
      .addTo(map);
    startMarker.on('dragend', function() { onDragEnd('S'); });
    start_set = 'Y';
    onDragEnd('S');
  }
})
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
  if (this.readyState == 4 && this.status == 200) {
    sprite = JSON