def node_to_GeoJSON(node, graph, color="#F5A207"):
    """Convert node to GeoJSON string."""
    data = graph.nodes[node]
    lat = data['lat']
    lon = data['lon']
    node_string = ''
    node_string += '{ "type" : "Feature",\n'
    node_string += '"geometry" : {"type": "Point", "coordinates": [%f,%f]},\n'%(lon, lat)
    node_string += '"properties": {"marker-color": "%s"}\n'%(color)
    node_string += '}\n'
    return node_string