OSRM Multi Source Single Destination Routing

Based on: https://github.com/Project-OSRM/osrm-backend

NodeJS Binding: https://github.com/Project-OSRM/osrm-backend/wiki/node-osrm-api

The Problem

There seems to be a fork or two that support multi source/destination routes, but these forks are a year+ old and I can't seem to get them to run. Making multiple requests the the default server is slow(er).

Hacky Solution

The route API allows for multiple point routes, so navigate to each source to destination to next source to destination, etc. Fastest way I can see w/o modifiation of C++ source. (Note, there is a a table API query, but this only returns time...).

Setup

First, like any osrm source, prepare the data (you need to build osrm to get these tools):

# open street map protocal buffer
# Good place to get it: http://download.geofabrik.de/
osrm-extract mydata.osm.pbf
# generated above
osrm-contract mydata.osrm

now install

git clone https://github.com/CSTARS/osrm-transportation-server
cd osrm-transportation-server && npm install

finally create a config file

{
    "port" : 5000,
    "data" : "/path/to/your/data.osrm" 
}

Run

node index.js /path/to/config.json

API

Requests go to /. Can be GET or POST.

Parameters

• sources: [[lng, lat], [lng, lat], ...]
• destination: [lng, lat]
• steps : true | false

sources and destination should be stringify JSON.

Response

[{
    summary: 'I 5, I 5;US 12',
    duration: 1494.2, // in seconds
    steps: { // only if steps=true
        type: 'LineString', 
        coordinates: [Object] 
    },
    distance: 35535.2 // in meters
}, ...]