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Georeferencing Historical Placenames and Tracking Changes Over Time Georeferencing Workshop Harvard University 21 March 2008 Lex Berman China Historical GIS Project
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Non-Ambiguous Placenames in GNS [Volz, et al, 2007]
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Non-Ambiguous Placenames in CHGIS Gazetteer
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Percentages of Non-Ambiguous Placenames - Comparison
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instance 1: St. Petersburg (Russia) Begin=1703 End=1913 instance 2: Petrograd (Russia) Begin=1914 End=1923 instance 3: Leningrad (Russia) Begin=1924 End=1990 instance 4: St.Petersburg (Russia) Begin=1991 instance 5: St. Petersburg (Florida, USA) Begin=1892 instance 1,4: St. Petersburg (Russia) instance 5: St. Petersburg (Florida, USA) before dissolve after dissolve Dissolving multiple historical instances of same spelling
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Non-Ambiguous Placenames - Dissolving Temporal Instances
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Comparison with Perseus Toponym Disambiguation
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Feature Type Thesauri
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Feature Type Crosswalks - Building a Concept Lattice No Standard Method
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Semantic Mapping Issues
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Feature Type Crosswalk Based on Controlled Vocabulary Semantic fragmentation = no feasible constraints on concepts
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Crosswalk of named periods and chronologies is needed
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HEML - Historical Event Markup Language
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MIT Simile Project - Timeline
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Temporal Fragmentation Temporal fragmentation = feasible limits and ISO 8601 Standard
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China Historical GIS Project http://www.fas.harvard.edu/~chgis Georeferencing Temporal Referencing Feature type Toponym string Time Period
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