Universidade Federal de Viçosa Centro de Ciências Exatas e Tecnológicas Departamento de Informática DM4VGI: A TEMPLATE WITH DYNAMIC METADATA FOR DOCUMENTING AND VALIDATING THE QUALITY OF VOLUNTEERED GEOGRAPHIC INFORMATION Wagner Dias de Souza Jugurta Lisboa Filho Jarbas Nunes Vidal Filho Jean Henrique de Souza Câmara Speaker: Wagner Dias de Souza Outline 2 Introduction Concepts Volunteered Geographic Information Objectives Materials and Methods Results Dynamic Metadata for VGI (DM4VGI) Architecture for VGI documentation Conclusions 3 Introduction Introduction 4 Web 2.0 User-generated content Volunteered Geographic Information 5 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] Geobrowsers 6 Geobrowsers 7 Geobrowsers 8 Many Geobrowsers Absence of standards to collect data Disconnected data Metadata 9 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. 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 Methods for improving the quality of VGI 11 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) 12 Objectives Objectives 13 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. 14 Materials and Methods Materials and Methods 15 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 Element Value • Title • Armed robbery Implementation • <Title>Armed robbery</Title> 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 Dynamic Metadata for VGI – DM4VGI 18 Dynamic Metadata for VGI – DM4VGI 19 Identification Group Dynamic Metadata for VGI – DM4VGI 20 Time Record Group Dynamic Metadata for VGI – DM4VGI 21 Geopositioning Group Dynamic Metadata for VGI – DM4VGI 22 VGI Quality Group Dynamic Metadata for VGI – DM4VGI 23 Auditing and Distribution Group Architecture for VGI documentation in Geobrowser 24 VGI environment: Home page 25 VGI environment: Collaborate 26 VGI environment: Visualize 27 VGI environment: Forum 28 VGI environment: Dynamic Metadata 29 VGI environment: Dynamic Metadata 30 VGI environment: Dynamic Metadata 31 VGI environment: Dynamic Metadata 32 VGI environment: DM4VGI template 33 34 Conclusions Conclusions 35 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. 36 Questions? Projeto Cidadão Viçosa - MG http://www.ide.ufv.br/cidadaovicosa VGI environment: “News” 37 VGI environment: Search on metadata 38 VGI environment: Statistics 39 VGI environment: Category and Type Filter 40 VGI environment: Kernel’s map 41 VGI environment: Data Analysis 42 VGI environment: User Rankings 43 Another tools 44 Historical Data. Generate table with all the data volunteers. Download metadata in XML. Contact administrators. Current analysis about Cidadão Viçosa - MG 45 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.