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Modeling and Visualizing Historical GIS Data
Spatio-Temporal Workshop
Harvard University
10 April 2009
Lex Berman
China Historical GIS Project
What is Historical GIS?
• geographic scope
• temporal range
• level of detail
• data model
Polygon compilation process
Painstakingly Slow!
Polygons vs. Networks
Datestamping of Arc Segments
Spatio-temporal Composite
Spatial Fragmentation!
Temporal Change Tables
Asynchronous Changes
Administrative Hierarchy
Nodes + Relationships
Nanjing 南京
Zhongdu 中都
Beijing 北京
Networks + Clustering
Image: Corina Graif
Enclosures and Overlaps
Networks + Spatial Analysis
Plum Pudding in Danger
Network Model for Spatio-Temporal Visualization
Proof of Concept: Fujian Province
GoogleEarth KML: teKML (time enabled KML)
Time Animation Test in GoogleEarth: Sui Dynasty
Visualization of Node to Node Movements
• nodes of presence
• target locations
• paths of movement
• cumulative trail of movement
Visualization of Node to Node Movements
Spatio-Temporal Model
Node Features
Relationships
Specific Periods
Areal Units Post-Processing
China Historical GIS Project
http://www.fas.harvard.edu/~chgis