master thesis defense
DESCRIPTION
Slides for my master thesis defenseTRANSCRIPT
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The Complexity of Urban Information GatheringAbdulfatai Popoola
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Representation Formats
Primal Dual
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Measuring Difficulty
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Eigenvector Centrality
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Metrics
Centrality Measure Significance
Entropy Uncertainty
Gini Coefficient Diversity
Coefficient of Variation Variation
Freeman Degree Centralization
Network Structure
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Metrics - Significance
Centrality Measure Significance
Entropy High values -> ease of search
Gini Coefficient Low values -> ease of search
Coefficient of Variation Variation in road popularity
Freeman Degree Centralization
City layout
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Overview
• Data collection
Stage I
• ProcessingStage
II• Analysis
Stage III
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Stage 1: Data Collection
▪ Openstreetmap
▪ Challenges
▪ Extra data: age, crime, continent, structure, area, population
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Merging Roads
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Artificial data
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Processed Data
• Inter metric correlations
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Discoveries…
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Correlation
• Age
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Correlation
• Age
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Correlation
• Crime I
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Correlation
• Crime II
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Continental Boxplots
Entropy Gini Coefficient
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Stats
Difference
Asia-Europe False
Asia-North America True
Europe-North America True
df H P < 0.05
Entropy 2 51.62 True
Gini Coefficient 2 44.65 True
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Structural Boxplots
Entropy Gini Coefficient
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Statsdf H P < 0.05
Entropy 2 2.20 False
Gini Coefficient 2 2.07 False
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No significant Correlations
• Area
• Population
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Contributions
▪ Model
▪ JIZNA
▪ Applications
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2012
Tag Challenge
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Tag Challenge Cities
• Entropy
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More to come
Data
Dynamic characteristics
DARPA’s Red Balloon Challenge
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Finally…
▪ Just about three major things
▪ The age of a city can influence the ease of search.
▪ City structure has no significant influence on ease of search.
▪ North American cities easier to search than European/Asian cities.
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Thank you.
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Questions
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extras
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Projections
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Normalization