OpenStreetMap (OSM) is a free, open-source, editable map website that can provide free download. osm2gmns, as a data conversion tool, can directly convert the OSM map data to node and link network files in the GMNS format. Users can convert and model drivable, walkable, railway, or aeroway networks with a single line of Python code.
pip install osm2gmns
Get network from map.osm file and consolidate complex intersections
>>> import osm2gmns as og
>>> net = og.getNetFromOSMFile('map.osm')
>>> og.outputNetToCSV(net)
You can visualize generated networks using NeXTA or QGis.
For detailed users' guide, readers can visit the online documentation.