pyGraphhopper

A utility which allows you to use openstreetmap using graphhopper in python. It uses py4j to bridge between java and python.

Prerequisites

1. Java
2. Python
3. py4j python module globally
4. The pbf file of open street map for the locality you want to work upon. (e.g. http://download.geofabrik.de/asia/indonesia-latest.osm.pbf)

Installing

1. Get the pbf file at desired dir. e.g.

wget http://download.geofabrik.de/asia/indonesia-latest.osm.pbf

2. Install the java dependencies

mvn clean
mvn install dependency:copy-dependencies
mvn install

3. Start the java gateway server:

java -cp ./target/route_distance-1.0-SNAPSHOT.jar:./target/dependency/* pygraphhopper.Gateway

4. APIs are ready to be called form python:

from py4j.java_gateway import JavaGateway
#Creating bridge to Java gateway!
gateway = JavaGateway()
routeCalculator = gateway.entry_point.getRCObject("osm_work_dir", "car", "indonesia-latest.osm.pbf")
routeCalculator.getDistance(orig_lat, orig_lon, dest_lat, dest_lon, "car")

APIs:

1. getRouteDistance: routeCalculator.getDistance

   This function returns the actual route distance between two geolocations given the type of compute (walk/car)

2. processFiles: routeCalculator.mainHelper

   To calculate the route distance for a set of geolocations in a csv.

TODO:

Add more APIs provided by graphhopper, only calculate route distance is being provided right now.

Contribution

Pick something from TODO list and raise PR. :) Earn as many thanks as possible.

License

This project is licensed under the MIT License.

Acknowledgments

• Graphhopper