notebooks/05-save-load-networks.ipynb

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   "source": [
    "# Save/load street network models to/from disk\n",
    "\n",
    "Author: [Geoff Boeing](https://geoffboeing.com/)\n",
    "\n",
    "  - [Overview of OSMnx](http://geoffboeing.com/2016/11/osmnx-python-street-networks/)\n",
    "  - [GitHub repo](https://github.com/gboeing/osmnx)\n",
    "  - [Examples, demos, tutorials](https://github.com/gboeing/osmnx-examples)\n",
    "  - [Documentation](https://osmnx.readthedocs.io/en/stable/)\n",
    "  - [Journal article/citation](http://geoffboeing.com/publications/osmnx-complex-street-networks/)\n",
    "  \n",
    "This notebook demonstrates how to save networks to disk as shapefiles, geopackages, graphml, and xml, and how to load an OSMnx-created network from a graphml file."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import osmnx as ox\n",
    "\n",
    "%matplotlib inline\n",
    "ox.__version__"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# get a network\n",
    "place = \"Piedmont, California, USA\"\n",
    "G = ox.graph_from_place(place, network_type=\"drive\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Shapefiles and GeoPackages for GIS"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# save graph as a geopackage\n",
    "# you can similarly save it as a shapefile, if you prefer obsolete formats\n",
    "ox.save_graph_geopackage(G, filepath=\"./data/piedmont.gpkg\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## GraphML files for saving network and preserving topological detail"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# save/load graph as a graphml file: this is the best way to save your model\n",
    "# for subsequent work later\n",
    "filepath = \"./data/piedmont.graphml\"\n",
    "ox.save_graphml(G, filepath)\n",
    "G = ox.load_graphml(filepath)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# if you want to work with your model in gephi, use gephi compatibility mode\n",
    "ox.save_graphml(G, filepath=filepath, gephi=True)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## SVG file to work with in Adobe Illustrator"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# save street network as SVG\n",
    "fig, ax = ox.plot_graph(G, show=False, save=True, close=True, filepath=\"./images/piedmont.svg\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Save points of interest or building footprints"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# get all \"amenities\" and save as a geopackage via geopandas\n",
    "gdf = ox.geometries_from_place(place, tags={\"amenity\": True})\n",
    "gdf = gdf.apply(lambda c: c.astype(str) if c.name != \"geometry\" else c, axis=0)\n",
    "gdf.to_file(\"./data/pois.gpkg\", driver=\"GPKG\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# get all building footprints and save as a geopackage via geopandas\n",
    "gdf = ox.geometries_from_place(place, tags={\"building\": True})\n",
    "gdf = gdf.apply(lambda c: c.astype(str) if c.name != \"geometry\" else c, axis=0)\n",
    "gdf.to_file(\"./data/building_footprints.gpkg\", driver=\"GPKG\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Save .osm XML files\n",
    "\n",
    "To save your graph to disk as a .osm formatted XML file, ensure that you created the graph with `ox.settings.all_oneway=True` for `save_graph_xml` to work properly. See docstring for details.\n",
    "\n",
    "To save/load full-featured OSMnx graphs to/from disk for later use, use the `save_graphml` and `load_graphml` functions instead."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# save graph to disk as .osm xml file\n",
    "ox.settings.all_oneway = True\n",
    "ox.settings.log_console = True\n",
    "G = ox.graph_from_place(\"Piedmont, California, USA\", network_type=\"drive\")\n",
    "ox.save_graph_xml(G, filepath=\"./data/piedmont.osm\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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