DM4VGI: Um template com metadados dinâmicos para

Report
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
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Introduction
Concepts
Volunteered Geographic Information
Objectives
Materials and Methods
Results
Dynamic Metadata for VGI (DM4VGI)
Architecture for VGI documentation
Conclusions
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Introduction
Introduction
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Web 2.0
User-generated content
Volunteered Geographic Information
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Volunteered Geographic Information (VGI)
According to Goodchild (2007), VGI features a
specific type of "user-generated content", which
combines three key elements:
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Web 2.0 [O’Reilly, 2010]
Collective Intelligence [Lévy, 1999]
Neogeography [Turner, 2010]
Geobrowsers
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Geobrowsers
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Geobrowsers
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Many Geobrowsers
Absence of standards to collect data
Disconnected data
Metadata
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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.
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Metadata
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Are there metadata for VGI ?
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Problems
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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
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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)
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Objectives
Objectives
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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.
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Materials and Methods
Materials and Methods
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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?
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(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…
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Results
Dynamic Metadata for VGI – DM4VGI
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Dynamic Metadata for VGI – DM4VGI
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Identification Group
Dynamic Metadata for VGI – DM4VGI
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Time Record Group
Dynamic Metadata for VGI – DM4VGI
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Geopositioning Group
Dynamic Metadata for VGI – DM4VGI
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VGI Quality Group
Dynamic Metadata for VGI – DM4VGI
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Auditing and Distribution Group
Architecture for VGI documentation in Geobrowser
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VGI environment: Home page
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VGI environment: Collaborate
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VGI environment: Visualize
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VGI environment: Forum
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VGI environment: Dynamic Metadata
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VGI environment: Dynamic Metadata
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VGI environment: Dynamic Metadata
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VGI environment: Dynamic Metadata
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VGI environment: DM4VGI template
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Conclusions
Conclusions
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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.
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Questions?
Projeto Cidadão Viçosa - MG
http://www.ide.ufv.br/cidadaovicosa
VGI environment: “News”
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VGI environment: Search on metadata
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VGI environment: Statistics
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VGI environment: Category and Type Filter
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VGI environment: Kernel’s map
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VGI environment: Data Analysis
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VGI environment: User Rankings
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Another tools
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Historical Data.
Generate table with all the data volunteers.
Download metadata in XML.
Contact administrators.
Current analysis about Cidadão Viçosa - MG
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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.
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