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# OpenStreetMap with OSMnx#

This example shows how to use OSMnx to download and model a street network from OpenStreetMap, visualize centrality, then save the graph as a GeoPackage, or GraphML file.

OSMnx is a Python package to download, model, analyze, and visualize street networks and other geospatial features from OpenStreetMap. You can download and model walking, driving, or biking networks with a single line of code then easily analyze and visualize them. You can just as easily work with urban amenities/points of interest, building footprints, transit stops, elevation data, street orientations, speed/travel time, and routing.

See https://osmnx.readthedocs.io for the OSMnx documentation. See gboeing/osmnx-examples for the OSMnx Examples gallery.

```
import networkx as nx
import osmnx as ox
ox.settings.use_cache = True
# download street network data from OSM and construct a MultiDiGraph model
G = ox.graph.graph_from_point((37.79, -122.41), dist=750, network_type="drive")
# impute edge (driving) speeds and calculate edge travel times
G = ox.speed.add_edge_speeds(G)
G = ox.speed.add_edge_travel_times(G)
# you can convert MultiDiGraph to/from GeoPandas GeoDataFrames
gdf_nodes, gdf_edges = ox.utils_graph.graph_to_gdfs(G)
G = ox.utils_graph.graph_from_gdfs(gdf_nodes, gdf_edges, graph_attrs=G.graph)
# convert MultiDiGraph to DiGraph to use nx.betweenness_centrality function
# choose between parallel edges by minimizing travel_time attribute value
D = ox.utils_graph.get_digraph(G, weight="travel_time")
# calculate node betweenness centrality, weighted by travel time
bc = nx.betweenness_centrality(D, weight="travel_time", normalized=True)
nx.set_node_attributes(G, values=bc, name="bc")
# plot the graph, coloring nodes by betweenness centrality
nc = ox.plot.get_node_colors_by_attr(G, "bc", cmap="plasma")
fig, ax = ox.plot.plot_graph(
G, bgcolor="k", node_color=nc, node_size=50, edge_linewidth=2, edge_color="#333333"
)
# save graph as a geopackage or graphml file
ox.io.save_graph_geopackage(G, filepath="./graph.gpkg")
ox.io.save_graphml(G, filepath="./graph.graphml")
```

**Total running time of the script:** (0 minutes 3.357 seconds)