What Geographic Factors Affect the Spatial Distribution of Ebola - PowerPoint PPT Presentation

2014 GIS Day What Geographic Factors Affect the Spatial Distribution of Ebola Virus Disease in West Africa Song Gao Email ： sgao@geog.ucsb.edu STKO Lab, Department of Geography http://www.geog.ucsb.edu/~sgao/

Ebola by the numbers: The size, spread and cost of an outbreak by Declan Butler & Lauren Morello

http://healthmap.org/ebola/#timeline

Correlation Coefficient: 0.722

Distance to Street Nodes and Edges

Distance to Street Nodes and Edges • 63% case locations within 10 km buffer zone • 81% case locations within 20 km buffer zone • 95% case locations within 30 km buffer zone of the highway junction nodes • 85% -> 10 km buffer zone of streets • 93% -> 20 km buffer zone of streets

Network Centrality  Sociology Scientist, Freeman (1979)  Degree Centrality  Closeness Centrality  Betweenness Centrality  Geographers, Porta et al. (2006); Gao et al. (2013)  Street Closeness Centrality  Street Betweenness Centrality  Street Straightness Centrality

Betweenness Centrality It measures how often a node is traversed by the geometry shortest paths connecting all pairs of nodes in the street network.

Spatial Human Structure Mobility • Population distribution • Facility Distribution • Digital Elevation Model Complex • Movements • Mobile Phone Call Networks • Interactions • Functional region • …… Information, Communication, Technology & Space, Place & Social