This repository provides the components to set up the map-matching service. It is based on PostGis and on Rserve. Both are provided as docker images. Rserve allows the communication between a Java application and R, the statistical framework. It includes some Rscripts that implement functions that are called remotely by the Java application. The R scripts send request to the PostGis container that computes the map-matching. The map matching algorithm is used to match the location of a vehicle given as a (longitude, latitude) pair to a road segment. The road network data, extracted from OpenStreetMap, is added to the PostGis image. The area covered is the city of Thessaloniki. The R and SQL scripts are provided by CERTH-HIT.
Docker engine is required to build the images and run the containers. A docker network, e.g. "pilot-sc4-net", must be created to allow the communication between the containers using their names
$ docker network create pilot-sc4-net
A docker image with Postgres and PostGis can be built with the command
$ docker build -t bde2020/pilot-sc4-postgis:v0.10.0 .
Start a docker container with PostGis, name it e.g. "postgres", setting the password of the POSTGRES_USER=postgres (e.g. "password")
$ docker run --name postgis --network pilot-sc4-net -p 5432:5432 -e POSTGRES_PASSWORD=password -d bde2020/pilot-sc4-postgis:v0.10.0
Rserve allows the use of R scripts and functions from Java through a TCP/IP connection. The server can be configured setting some parameters in the Rserve.conf file. The parameters set are a source R file with the functions that will be called from Java, the port and the remote connection enabled. A docker image of the Rserve can be built with the command
$ docker build -t bde2020/pilot-sc4-rserve:v0.10.0 .
In order to start the container execute the command
$ docker run --name rserve --network pilot-sc4-net -p 6311:6311 -e POSTGRES_PASSWORD=password -d bde2020/pilot-sc4-rserve:v0.10.0
Both services can be started using docker-compose
$ docker-compose up -d
You can open a shell in the Rserve container with the command
$ docker exec -it rserve bash
From the Rserve container run the script
# Rscript test_mapmatch.R
The script communicates with the PostGis container to map-match records of taxis with road segments and returns the OSM identifiers of the matched road segments and the distance between the vehicle and the road segment.
Apache 2.0