1. DM4VGI: A TEMPLATE WITH DYNAMIC METADATA FOR DOCUMENTING AND VALIDATING THE QUALITY OF VOLUNTEERED GEOGRAPHIC INFORMATION Wagner Dias de Souza Universidade Federal de Viçosa Centro de Ciências Exatas e Tecnológicas Departamento de Informática Speaker: Wagner Dias de Souza Jugurta Lisboa Filho Jarbas Nunes Vidal Filho Jean Henrique de Souza Câmara

2. Outline 2 Introduction  Concepts  Volunteered Geographic Information Objectives Materials and Methods Results  Dynamic Metadata for VGI (DM4VGI)  Architecture for VGI documentation Conclusions

3. Introduction 3

4. 4 Web 2.0 User-generated content

5. Volunteered Geographic Information Volunteered Geographic Information (VGI) According to Goodchild (2007), VGI features a specific type of "user-generated content", which combines three key elements:  Web 2.0 [O’Reilly, 2010]  Collective Intelligence [Lévy, 1999]  Neogeography [Turner, 2010] 5

6. Geobrowsers 6

7. 7

8. 8 Many Geobrowsers Absence of standards to collect data Disconnected data

9. Metadata Data that describe other data Metadata standards  Dublin Core or ISO19115 Metadata implementation standards:  XML or RDF Metadata features  Documentation data  Information for data use  Data about the data quality All geographical data should have a set of metadata associated. 9

10. Metadata 10 Are there metadata for VGI ? Problems  Lack of standards and metadata  Users do not like to “waste time” providing metadata  Lack of incentives to provide metadata

11. Methods for improving the quality of VGI Wiki-Revision Reputation system User hierarchy Management zoom level Score about quality of the data Tools for automatic correction Goodchild et al. (2012), De Longueville et al. (2010), Cooper et al. (2010, 2011 e 2012) and Maue (2007) 11

12. Objectives 12

13. Objectives The paper proposes a template called Dynamic Metadata for VGI (DM4VGI) with dynamic metadata for document VGI. This article also proposes an architecture for documentation of VGI. 13

14. Materials and Methods 14

15. Materials and Methods Template  ISO 19115:2003 and Dublin Core  Dynamic Metadata  XML (eXtensible Markup Language) Architecture  Many elements are automatically captured  Methods for improving the quality of VGI 15 Title Element Armed robbery Value Armed robbery Implementation

16. How are the data automatically captured? 16 (1) Users E.g.: Title, Type, Category, Occurrence Data… (2) Functions in Geobrowser E.g.: Zoom, Collaboration Data, Web site, User IP… Combination of both (1 and 2) E.g.: Final Score, User Ranking…

17. Results 17

18. Dynamic Metadata for VGI – DM4VGI 18

19. Dynamic Metadata for VGI – DM4VGI 19 Identification Group

20. Dynamic Metadata for VGI – DM4VGI 20 Time Record Group

21. Dynamic Metadata for VGI – DM4VGI 21 Geopositioning Group

22. Dynamic Metadata for VGI – DM4VGI 22 VGI Quality Group

23. Dynamic Metadata for VGI – DM4VGI 23 Auditing and Distribution Group

24. Architecture for VGI documentation in Geobrowser 24

25. VGI environment: Home page 25

26. VGI environment: Collaborate 26

27. VGI environment: Visualize 27

28. VGI environment: Forum 28

29. VGI environment: Dynamic Metadata 29

30. VGI environment: Dynamic Metadata 30

31. VGI environment: Dynamic Metadata 31

32. VGI environment: Dynamic Metadata 32

33. VGI environment: DM4VGI template 33

34. Conclusions 34

35. Conclusions VGI has metadata. But VGI metadata are dynamic !! Data documented by DM4VGI are interoperable. Humans and machines can analyze the data collected by DM4VGI. Data collected by Geobrowser along with DM4VGI can help in the decision making of the government, researchers, police and citizens. 35

36. Projeto Cidadão Viçosa - MG http://www.ide.ufv.br/cidadaovicosa Questions? 36

37. VGI environment: “News” 37

38. VGI environment: Search on metadata 38

39. VGI environment: Statistics 39

40. VGI environment: Category and Type Filter 40

41. VGI environment: Kernel’s map 41

42. VGI environment: Data Analysis 42

43. VGI environment: User Rankings 43

44. Another tools Historical Data. Generate table with all the data volunteers. Download metadata in XML. Contact administrators. 44

45. Current analysis about Cidadão Viçosa - MG 2013/08/01 - 2013/11/16 809 visitors 100 users  68 login as anonymous users  32 registered users 45 Collaborations All required elements were automatically captured. All optional elements (where provided) were automatically captured. 45