pyroutelib3

pyroutelib3

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Simple routing over OSM data.

pyroutelib3 is a Python library for simple routing over OpenStreetMap data.

import pyroutelib3

live_graph = pyroutelib3.osm.LiveGraph(pyroutelib3.osm.CarProfile())

start_node = live_graph.find_nearest_node((52.23201, 21.00737))
end_node = live_graph.find_nearest_node((52.24158, 21.02807))

route = pyroutelib3.find_route_without_turn_around(live_graph, start_node.id, end_node.id)
route_lat_lons = [live_graph.get_node(node).position for node in route]

The example above uses osm.LiveGraph, which automatically downloads OpenStreetMap data in tiles and caches them on your disk. It is much more wise to download the data beforehand from a service like Geofabrik OSM data extracts:

import pyroutelib3

with open("mazowieckie-latest.osm.pbf", "rb") as f:
    graph = pyroutelib3.osm.Graph.from_file(pyroutelib3.osm.CarProfile(), f)

start_node = graph.find_nearest_node((52.23201, 21.00737))
end_node = graph.find_nearest_node((52.24158, 21.02807))

route = pyroutelib3.find_route_without_turn_around(graph, start_node, end_node)
route_lat_lons = [graph.get_node(node).position for node in route]

pyroutelib3 not only is able to parse OpenStreetMap data into a graph (see the osm module), but also contains generic implementations of the A* path-finding algorithm (find_route and find_route_without_turn_around functions) and the k-d tree data structure (KDTree class).

This library was designed with extensibility in mind, and most components can be swapped for completely custom ones through the usage of well-defined protocols. As an example, a nx.GraphAdaptor is provided to use networkx graphs with pyroutelib3's functionality.

Installation

pip install --upgrade pyroutelib3

pyroutelib3 uses semantic versioning. Always specify dependencies on this library with a constraint on the major revision, e.g. pyroutelib3 ~= 2.0.0.

Note that version 1 of this library is incompatible with version 2.

Features

• Generic A* algorithm implementation (find_route and find_route_without_turn_around functions)
• Generic graph data structure (SimpleGraph class)
• Generic k-d data structure (KDTree class)
• Extensibility through usage of well-defined protocols (protocols module)
  • networkx compatibility (nx.GraphAdaptor and nx.ExternalGraphAdaptor classes)
• OSM XML and OSM PBF file parsing (osm.reader.read_features function)
• Converting OpenStreetMap data into a usable graph (osm.Graph class)
  • High customizability of the process through the usage of different profiles.
  • Expressing way preferences through the usage of penalties for unpreferred tags
  • Respecting access restrictions on ways
  • Support for turn restrictions, including restriction:TRANSPORT and exempt tags
  • Downloading data on-the-fly (osm.LiveGraph class)

License

pyroutelib3 is distributed under GNU GPL v3 (or any later version).

© Copyright 2024 Mikołaj Kuranowski

pyroutelib3 is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

pyroutelib3 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with pyroutelib3. If not, see http://www.gnu.org/licenses/.