1. Four aspects of relevance: content, time, location and network Pasi Fränti, Jinhua Chen and Andrei Tabarcea

2. Search engines Recommendation systems Web mining Event detection Push/pull notifications Clustering Social networks GPS tracectory analysis Road network extraction Preliminary content

3. Data Collection in MOPSI System GPS Data collector: Other users: MOPSI webpage/ Facebook Service directory N 62.63 E 29.86 User collection Last skiing of winter User: Pasi

4. Four aspects of relevance Example from practice

5. 1.Content 2.Time 3.Location 4.Network Last skiing of winter Date: 4.4.2010 Location: N 62.63 E 29.86 Arppentie 5, Joensuu Content of picture Keywords or informal description snow skis User: Pasi Aspect 1: Content

6. 1.Content 2.Time 3.Location 4.Network Last skiing of winter Date: 4.4.2010 Location: N 62.63 E 29.86 Arppentie 5, Joensuu Date Not expected in July User: Pasi Aspect 2: Time

7. 1.Content 2.Time 3.Location 4.Network Last skiing of winter Date: 4.4.2010 Location: N 62.63 E 29.86 Arppentie 5, Joensuu Exact coordinates Address for usability User: Pasi Aspect 3: Location

8. 1.Content 2.Time 3.Location 4.Network User: Pasi Relevance of data is defined by social or other network Aspect 4: Network

9. Data Collection in MOPSI System

10. Photos by categories in MOPSI

11. Content description Singapore flier (Going to) sauna (no words needed)

12. Description of pictures of people People by their name or role: -Runner -Floorball player Related to place: -Untung / STMIK -Young Andrei -My son Amir Among the pictures of people, 31% (21/68) has some kind of identity.

13. Description of events Content or location not enough. Description adds to the relevance. Examples: -Work: ecse, abi, mopsi meeting, ubiikki -Running competition: Åland half marathon -Actions attached with feelings: quality time in skiing elevator.

14. Location of travel photos Not easily recognized from content. Can be concluded from GPS data. Descriptions are used anyway: -Locations as such: Clarke Quay, Geger beach, Suceva, Tahkovuori and Aholansaari (location -With additional details: Petronas Towers, Heureka, Singapore flier, Olavin linna. -With additional feelings: Musta Pekka mutkan takana (Black Pete behind the curve)

15. Comparison with Picasa and Flickr

16. Photo distribution in MOPSI

17. Accuracy of mobile GPS

18. Technical problems Asynchronous problem (1) Asynchronous problem (2) Low illumination Interrupted transmission

19. Thank you Time for questions!