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Modeling Spatio-Temporal Networks with CHGIS
Lex Berman 贝明远
CHGIS, Harvard University
2nd Intl Workshop on Monies, Markets & Finance in East Asia
Ruhr-University Bochum
4 – 6th Oct 2007
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Funded By:
Henry R. Luce Foundation (2001 – 2004)
National Endowment for the Humanities (2005 – present)
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placenameadmin unit, populated place, natural feature, religious site, archaeological site, trade route, place where an event occurred, etc
feature type city, village, mountain, temple, ruin, trade route, etc
footprint latitude and longitude for each feature
source note citation of data source, commentary on feature
valid date date or range of time for which this record is valid
core elements of a digital gazetteer
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placename
feature type
coordinates
valid date
source note spatial objects
digital gazetteer GIS layers
CHGIS = gazetteer database + GIS layers
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scope: a base GIS of Chinese admin divisions
222 BCE秦始皇
1911 CE清宣统
POINT Features:
National Capitals
Province Capitals
Prefecture Capitals
County Capitals
Towns & Villages
POLYGON Features:
National & Regime Boundaries
Province Boundaries
Prefecture Boundaries
1911 County Boundaries
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Reference layer: 1820 Qing Dynasty
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Digitization process: maps scanned
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Digitization process: town points entered
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Digitization process: boundary entered
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Comparison of historic map with CHGIS data
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Example: Shandong 1911 county boundaries
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Example: Shandong with Town points
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Currently complete 1911 county boundaries
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Time Slice data = specific year of validity
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Data Model
Name Change
Unit Change
Location Change
Time Series = instances with ranges of time
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Time Series in GIS layers
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Time Series current progress
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CHGIS – Version 4 datasets
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Buddhist temple gazetteer sources
Da Qing yitongzhi.[Qing National Gazetteer]
Yajima, Genryo. Chugoku no ji’in.[Temples of China]
Tōhoku Daigaku Fuzoku Toshokan , 1966. [1941]
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Da Qing yitongzhi (Yitongzhi)
page from Yitongzhi
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Chugoku no ji’in (Yajima Index)
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Comparison of contents - Yitongzhi & Yajima
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georeferencing temple records, Yajima sites
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georeferencing temple records, CHGIS tables
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georeferencing temple records, map view
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overview of temple locations
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density of temples at each location
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Example: Song tax statistics
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Example: Mongolian Administration over time
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Example: distribution of ceramic kilns
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Associating data values with polygon features
select area of interest
convert to “shapefile”
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join new data values to GIS attribute table
export attribute data for focus area to TEXT file
add a new column to the
TEXT file
enter new values in the new column, then REJOIN to original
GIS focus area shapefile
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Thematic map based on new data values
create chloropleth map based on your
data
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Thiessen polgyons generated from points
center points + outer boundary
Thiessen Polygons based on points
aggregation of Thiessen boundaries
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population distribution – normalized by area
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Thiessen polygons compared with natural features
DEM backgroundMale Population (1820) normalized by area
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Mapping and animation of locations over time - Life of Ouyi Zhixu
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table of events with known dates & table of locations
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checking and correction of possible locations
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Addition of paths of movement between locations for each event
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Animation of points for each event, and paths of movement
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www.fas.harvard.edu/~chgis
photo: Heilongtan, Kunming, Yunnan