var shelterIcon = L.icon({
    iconUrl: '/assets/vendors/leaflet/images/marker-shelter.png',
    shadowUrl: '/assets/vendors/leaflet/images/marker-shadow.png',
    iconSize: [50, 50], // size of the icon
    iconAnchor: [20, 50], // point of the icon which will correspond to marker's location
    shadowAnchor: [4, 62],  // the same for the shadow
    popupAnchor: [5, -50] // point from which the popup should open relative to the iconAnchor
});