1. A Community Platform for
Auto-Annotated Recreational Maps
Till Riedel1, Phillip Scholl1, Christian Decker1 and Michael Beigl2
1TecO,Universität Karlsruhe(TH), Vincenz Prießnitz Str. 3
76131 Karlsruhe, Germany
<{riedel,scholl,cdecker}@teco.edu>
2IBR,UniversitätBraunschweig, Mühlenpfordstr. 23
Braunschweig , Germany
<beigl@teco.edu>

2. Motivation
 Recreational maps
 Outdating
 Specialized
City map Karlsruhe: Skate map Karlsruhe:
still using Version from 1990 Specialized Annotation
(or Google maps :-) ) Should have newest version !
2 A Community Platform for Auto-Annotated Recreational Maps (SWDMNSS 2007)

3. Recreational Maps
 Specialized for sport, degree of expertise
 more detailed annotation = better map
 road size doesn't matter
 Road quality reflected in coloring/style
 Not many print runs depending on sport
 Out-dating rapidly:
Nature
Minor road work
3 A Community Platform for Auto-Annotated Recreational Maps (SWDMNSS 2007)

4. Alternative:
Track sharing communities
 Large Community
 Sharing single tracks
 Simple or text based
annotation
 Subjective/Biased
4 A Community Platform for Auto-Annotated Recreational Maps (SWDMNSS 2007)

5. Problem
 Track fusion dependent on sports device
 Differentiated annotation makes system complex
 Users tend not to waste their time on intricate stuff
 We need many users to build complete maps
Dilemma:
many users vs complex system
complete maps vs differentiated annotation
5 A Community Platform for Auto-Annotated Recreational Maps (SWDMNSS 2007)

6. Community Platform for
Auto-Annotated Recreational Maps
 Minimal effort
Automate process as much as possible
 Minimal cost
Use available technology
 Minimal risk
Anonymization: don't share raw personal data
6 A Community Platform for Auto-Annotated Recreational Maps (SWDMNSS 2007)

7. (kind of) Wireless Sensor Networks
 Sensor Nodes = Sportsmen w/:
Sensor Watches/Sensors on Equipment
Handheld GPS Systems
 Mobile sparsely synchronized sensors
high coverage
high availabiliy
only back-end communication
7 A Community Platform for Auto-Annotated Recreational Maps (SWDMNSS 2007)

8. Track Classification
 Classifier for Road Quality
 Use input from sensors:
Acceleration
Vibration
GPS (speed, slope)
 Simple rule based system:
e.g.: low(vibration(R)) => good(R)
Preset rule sets for different devices/preferences
Adjustable by user
8 A Community Platform for Auto-Annotated Recreational Maps (SWDMNSS 2007)

9. Map Creation
 Create network of roads
 Which tracks belong to same road?
Routes not equal in strict sense
 Algorithm described in: Scott Morris, Alan Morris, Kobus
Barnard, Digital Trail Libraries, jcdl, pp. 63-71, Digital Libraries,
2004 ACM/IEEE Joint Conference on (JCDL'04), 2004.
9 A Community Platform for Auto-Annotated Recreational Maps (SWDMNSS 2007)

10. Aggregation and Personalization
 Collect all predicates on all sub-tracks
Use road intersections to uniquely identify parts
Use common sensor predicates
 Query locally restricted
 Aggregate all data (bias towards recent data)
 Reclassify using users preference
 Color map by new classification
10 A Community Platform for Auto-Annotated Recreational Maps (SWDMNSS 2007)

11. Hardware
 Cheap sensors:
Measure vibration
Low power
Affordable for early adopters
 Loose coupling with location system:
Standard handheld GPS
Use existing technology
Only use timestamps to synchronize
11 A Community Platform for Auto-Annotated Recreational Maps (SWDMNSS 2007)

12. Future Work
 From Concept to Implementation :)
 Studies for different outdoor sports
Cycling
Inline skating
Hiking
 Use this kind of WSNs in other apps
highly mobile and sparsely synchronized
low power and high coverage
12 A Community Platform for Auto-Annotated Recreational Maps (SWDMNSS 2007)

13. Conclusion
 Concept for enhancing maps with sensor
information
rather than just displaying values
 Use Communities and enable personalization
 Design aspects for mass adaptation
also critical to other sensor web apps
 Widen the understanding of wireless sensor
networks
sensors don't have to be connected all the time
13 A Community Platform for Auto-Annotated Recreational Maps (SWDMNSS 2007)