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Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing
Bachelor's Thesis
Lukas Murmann
Thursday, October 20, 2011
A Locally Limited Indoor Location-Based Service for Privacy-Aware Location Sharing – Lukas Murmann
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
Abstract
At the VMI group since march - What are my results
Thursday, October 20, 2011 A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann 2
Ubiversity Thesis MMensa Field Study
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
Outline
• Problem Domain LBS Outdoors and Indoors
• Ubiversity Indoor Location Sharing
• Field Study Goal, Execution, Results
• Conclusion
• Q&A
A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann Thursday, October 20, 2011 3
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
4 A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann Thursday, October 20, 2011
Related Location-Sharing Services
Foursquare
• Gamification
• Checkin only
Facebook Places
• Checkin
• Social
Google Latitude
• Continuous tracking
• Location History
• Now also: Checkin
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
5 A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann Thursday, October 20, 2011
Common Building Blocks of Outdoor LBSs
Mapping
• Google Maps
• OpenStreetMap
Localization
• Cell Towers
• GPS
• WiFi
Places of Interest
• Google Places
• Many POI databases
(Cafés, Restaurants, …)
Images: office.com
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
6 A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann Thursday, October 20, 2011
No Building Blocks Available For Indoor Services
Mapping
• Google Maps
• OpenStreetMap
Localization
• Cell Towers
• GPS
• WiFi
Places of Interest
• Google Places
• Many more Geocoders
There is a need for reusable indoor service building blocks
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
General Architecture
Thursday, October 20, 2011 A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann 7
Sources: office.com, djangoproject.com, android.com, python.org
User Interaction
Maps
Lists
Manual Checkin
Sensors
WiFi
NFC
QR-Code
Android Clients
POI Data
Rooms
Buildings
Fingerprint DB
Social Data
Accounts
Friend Lists
Permissions
Django Backend
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
Checkin-Based Self-Training Localization
Thursday, October 20, 2011 A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann 8
1. Manual Checkin at POI
2. Send WiFi Fingerprint to Server
3. Server stores (POI, FP) tuple
Online Training
1. Send WiFi Fingerprint to Server
2. Server calculates similarity to
reference fingerprints
3. List of most probable POIs is
returned
Localization
No need for initial training phase
Outdated training data gets continuously updated
Deployable wherever enough WiFi APs exist
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
Thursday, October 20, 2011 A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann 9
Mapping Tool
• User Locates three Pins
• Tool solves linear equation
• Calculates Map Tile's
• Translation
• Rotation
• On Device: Combine several
tiles to a single map
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
Ubiversity's most important POIs are TUM rooms
• Read Room Data from TUMOnline (25.000+ Rooms)
• Store most important data locally on device
• Synchronize full data set on server
• Django SQLite export tool exists.
• Make RoomDB available as Android Content Provider
Thursday, October 20, 2011 A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann 10
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
11 A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann Thursday, October 20, 2011
The Ubiversity App Showcases those Building Blocks
See Friend's Checkins Check In at TUM Combined Map View
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
The Field Study
A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann Thursday, October 20, 2011 12
Does a local web service like Ubiversity have a less
severe privacy impact than global, commercial services? ? Pre
Survey Test
Phase Post
Survey Interviews
Questions on
experience with
related services
Participants used
Ubiversity for 2-3
weeks
What was the
perceived value?
Were there
privacy
implications?
Personal interviews
with selected
participants
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
Study Evaluation
Location-Sharing may be even more useful in single-campus deployments
• Short distances
Thursday, October 20, 2011 A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann 13
Interviews and post survey suggest that users feel less reluctant to
share location information on a platform with smaller scale.
Location sharing has high dependency on network effects
• Challenge for both, field study and real product
Very positive feedback regarding privacy impact
• No commercial use
• Local scope
• Less connectedness
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
Conclusion
Thursday, October 20, 2011 A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann 14
Thank you for your attention
Privacy-aware location
sharing on campus
Reusable components
for indoor LBS
Field study on possible
barriers for LBS adoption
Contributions by this work
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
Backup Thursday, October 20, 2011
A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann 15
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
Ubiversity Web Site
Thursday, October 20, 2011 A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann 16
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
MMensa App Contributed to VMI Mensa
Thursday, October 20, 2011 A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann 17
Technische Universität München
Fachgebiet Verteilte Multimodale Informationsverarbeitung
Prof. Dr. Matthias Kranz
Localization Algorithm in Pseudo Code
Thursday, October 20, 2011 A Locally Limited Indoor Location-Based Service for
Privacy-Aware Location Sharing – Lukas Murmann 18