osrm-backend/README.md

Open Source Routing Machine

High performance routing engine written in C++ designed to run on OpenStreetMap data.

The following services are available via HTTP API, C++ library interface and NodeJs wrapper:

• Nearest - Snaps coordinates to the street network and returns the nearest matches
• Route - Finds the fastest route between coordinates
• Table - Computes the duration or distances of the fastest route between all pairs of supplied coordinates
• Match - Snaps noisy GPS traces to the road network in the most plausible way
• Trip - Solves the Traveling Salesman Problem using a greedy heuristic
• Tile - Generates Mapbox Vector Tiles with internal routing metadata

To quickly try OSRM use our demo server which comes with both the backend and a frontend on top.

For a quick introduction about how the road network is represented in OpenStreetMap and how to map specific road network features have a look at the OSM wiki on routing or this guide about mapping for navigation.

Related Project-OSRM repositories:

• osrm-frontend - User-facing frontend with map. The demo server runs this on top of the backend
• osrm-text-instructions - Text instructions from OSRM route response
• osrm-backend-docker - Ready to use Docker images

Documentation

Full documentation

• Hosted documentation
• osrm-routed HTTP API documentation
• libosrm API documentation

Contact

• Discord: join
• IRC: irc.oftc.net, channel: #osrm (Webchat)
• Mailinglist: https://lists.openstreetmap.org/listinfo/osrm-talk

Quick Start

The easiest and quickest way to setup your own routing engine is to use Docker images we provide.

There are two pre-processing pipelines available:

• Contraction Hierarchies (CH)
• Multi-Level Dijkstra (MLD)

we recommend using MLD by default except for special use-cases such as very large distance matrices where CH is still a better fit for the time being. In the following we explain the MLD pipeline. If you want to use the CH pipeline instead replace osrm-partition and osrm-customize with a single osrm-contract and change the algorithm option for osrm-routed to --algorithm ch.

Using Docker

We base our Docker images (backend, frontend) on Debian and make sure they are as lightweight as possible. Older backend versions can be found on Docker Hub.

Download OpenStreetMap extracts for example from Geofabrik

wget http://download.geofabrik.de/europe/germany/berlin-latest.osm.pbf

Pre-process the extract with the car profile and start a routing engine HTTP server on port 5000

docker run -t -v "${PWD}:/data" ghcr.io/project-osrm/osrm-backend osrm-extract -p /opt/car.lua /data/berlin-latest.osm.pbf || echo "osrm-extract failed"

The flag -v "${PWD}:/data" creates the directory /data inside the docker container and makes the current working directory "${PWD}" available there. The file /data/berlin-latest.osm.pbf inside the container is referring to "${PWD}/berlin-latest.osm.pbf" on the host.

docker run -t -v "${PWD}:/data" ghcr.io/project-osrm/osrm-backend osrm-partition /data/berlin-latest.osrm || echo "osrm-partition failed"
docker run -t -v "${PWD}:/data" ghcr.io/project-osrm/osrm-backend osrm-customize /data/berlin-latest.osrm || echo "osrm-customize failed"

Note there is no berlin-latest.osrm file, but multiple berlin-latest.osrm.* files, i.e. berlin-latest.osrm is not file path, but "base" path referring to set of files and there is an option to omit this .osrm suffix completely(e.g. osrm-partition /data/berlin-latest).

docker run -t -i -p 5000:5000 -v "${PWD}:/data" ghcr.io/project-osrm/osrm-backend osrm-routed --algorithm mld /data/berlin-latest.osrm

Make requests against the HTTP server

curl "http://127.0.0.1:5000/route/v1/driving/13.388860,52.517037;13.385983,52.496891?steps=true"

Optionally start a user-friendly frontend on port 9966, and open it up in your browser

docker run -p 9966:9966 osrm/osrm-frontend
xdg-open 'http://127.0.0.1:9966'

In case Docker complains about not being able to connect to the Docker daemon make sure you are in the docker group.

sudo usermod -aG docker $USER

After adding yourself to the docker group make sure to log out and back in again with your terminal.

We support the following images in the Container Registry:

Name	Description
latest	master compiled with release flag
latest-assertions	master compiled with with release flag, assertions enabled and debug symbols
latest-debug	master compiled with debug flag
<tag>	specific tag compiled with release flag
<tag>-debug	specific tag compiled with debug flag

Building from Source

The following targets Ubuntu 22.04. For instructions how to build on different distributions, macOS or Windows see our Wiki.

Install dependencies

sudo apt install build-essential git cmake pkg-config \
libbz2-dev libxml2-dev libzip-dev libboost-all-dev \
lua5.2 liblua5.2-dev libtbb-dev

Compile and install OSRM binaries

mkdir -p build
cd build
cmake ..
cmake --build .
sudo cmake --build . --target install

Request Against the Demo Server

Read the API usage policy.

Simple query with instructions and alternatives on Berlin:

curl "https://router.project-osrm.org/route/v1/driving/13.388860,52.517037;13.385983,52.496891?steps=true&alternatives=true"

Using the Node.js Bindings

The Node.js bindings provide read-only access to the routing engine. We provide API documentation and examples here.

You will need a modern libstdc++ toolchain (>= GLIBCXX_3.4.26) for binary compatibility if you want to use the pre-built binaries. For older Ubuntu systems you can upgrade your standard library for example with:

sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update -y
sudo apt-get install -y libstdc++-9-dev

You can install the Node.js bindings via npm install @project-osrm/osrm or from this repository either via

npm install

which will check and use pre-built binaries if they're available for this release and your Node version, or via

npm install --build-from-source

to always force building the Node.js bindings from source.

Unscoped packages

Prior to v5.27.0, the osrm Node package was unscoped. If you are upgrading from an old package, you will need to do the following:

npm uninstall osrm --save
npm install @project-osrm/osrm --save

Package docs

For usage details have a look these API docs.

An exemplary implementation by a 3rd party with Docker and Node.js can be found here.

References in publications

When using the code in a (scientific) publication, please cite

@inproceedings{luxen-vetter-2011,
 author = {Luxen, Dennis and Vetter, Christian},
 title = {Real-time routing with OpenStreetMap data},
 booktitle = {Proceedings of the 19th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems},
 series = {GIS '11},
 year = {2011},
 isbn = {978-1-4503-1031-4},
 location = {Chicago, Illinois},
 pages = {513--516},
 numpages = {4},
 url = {http://doi.acm.org/10.1145/2093973.2094062},
 doi = {10.1145/2093973.2094062},
 acmid = {2094062},
 publisher = {ACM},
 address = {New York, NY, USA},
}