This document describes a location-based platform for public transport monitoring. It aims to provide real-time positioning of public transportation routes on a map interface to help users find the fastest routes. The platform uses open protocols and stores data in PostgreSQL. Mobile clients on Android and Maemo send location data to the server, while a desktop client displays user positions on a map. Future plans include more client platforms and testing on MeeGo devices.

1. Location based platform for
public transport
monitoring system
FRUCT LETI Lab,
Mark Zaslavskiy,
Open Source & Linux Lab
FRUCT­9, Petrozavodsk, April 28, 2011

2. Motivation
Problem
● In modern megapolises transport problem is extremly
important – it is very difficult to find fastest way from
one place to another
● Due to traffic jams presonal trasport doesn`t guarantee
that you will arrive on time
● Usage of public transport is difficult, because usualy it
doesn`t comply with shedule
Solution
● Provide platform for collecting and displaing
information about current public transport routes
position 2

3. Goals
● Create platform for location­based services
with following features
– Provide easy and single interface for adding
information about user position
– Allow current position of user representation on a
map
● Create clients for most common mobile
platforms
3

4. Architecture
● Server part
– process data from different devices
– give access for geo­data by single protocol
● Mobile clients
– send data about current device position to server
● Desktop clients
– provide access to view position of the different users
on a map
4

5. Exchange protocol
● Simple
● Open
● JSON based
● Example of request
{
"auth_token" : "22babc4",
"channel" : "default",
"description" : "example",
"latitude" : 60.0,
"link" : "unknown",
"longitude" : 30.0,
"time" : "23 04 2011 20:16:38.381",
"title" : "mark example"
}
5

6. Server part
● Data exchange protocol
– JSON based open protocol throw http(more human
readable than XML and much more easier)
● Data storage
– all data stored in PostgreSQL(allow fast extending
on many hosts)
● Server application and webserver
– platform server is a FCGI application(simple and
allow to use C++ in web­services)
– platform use lighttpd web­server
6

7. Mobile clients
● Android client(written using
android­sdk, java based)
● Maemo client(Qt­based, ported
to Symbian)
7

8. Desktop client
● Show current position of users on a map
● Allow to filter position data by it age
● Qt based application for MeeGo
8

9. Demo
● How trasport moving is modeled
– Predefined track for each route
– Curl­based script for mark adding to
server
– Three parallel instanses of script
runned for each route
● Desktop client work
– Marks loaded from server
– The lastest marks for each route placed
on a map whis number and icon of
the route

10. Future plans
● Implement client for J2ME
● Add web interface support
●
Push Maemo/MeeGo client into OVI
● Testing MeeGo client on MeeGo devices

11. Project Links
● http://fruct.org/node/107
● http://osll.spb.ru/projects/geo2tag
●
https://github.com/OSLL/geo2tag

12. Questions & Answers
Mark Zaslavskiy,
mark.zaslavskiy@gmail.com
Open Source & Linux Lab,
http://osll.furct.org, osll@fruct.org