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Temporal GISes of Changing Administrative Boundaries: European Comparisons

Temporal GISes of Changing Administrative Boundaries: European Comparisons. Dr. Ian Gregory, Department of Geography, University of Portsmouth. The need for geography. Many countries have been publishing census and similar statistics for two centuries or more

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Temporal GISes of Changing Administrative Boundaries: European Comparisons

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  1. Temporal GISes of Changing Administrative Boundaries: European Comparisons Dr. Ian Gregory, Department of Geography, University of Portsmouth Dr. Ian Gregory

  2. The need for geography • Many countries have been publishing census and similar statistics for two centuries or more • Most of these datasets are geographical • They are also temporal as they are published at regular intervals • Traditionally: • Spatial detail is only available for individual snapshots • Temporal exploration grossly simplifies space Dr. Ian Gregory

  3. Temporal GIS • Opens up huge potential for exploring, analysing and visualising data through all three components: • Attribute • Space • Time • Problem: Temporal GIS only poorly developed Dr. Ian Gregory

  4. Spatio-temporal architecture • Three approaches: • Key dates (Ireland, Prussia) • Date stamping (GBHGIS) • Space-time composite (Sweden, Belgium) Dr. Ian Gregory

  5. Key dates • Simply digitise boundaries at important dates and link attribute data to them. Dr. Ian Gregory

  6. Date stamping Dr. Ian Gregory

  7. Date stamping (2) Dr. Ian Gregory

  8. Space-time composite Dr. Ian Gregory

  9. Infant mortality, 1890s Dr. Ian Gregory

  10. Infant mortality, 1890s (2) Dr. Ian Gregory

  11. Infant mortality, 1990s Dr. Ian Gregory

  12. Conclusions • There are three main approaches to building temporal GISes of changing administrative units • The key dates approach is the simplest but provides a good starting point for either of the others • Once built systems such as these open up massive new potential for understanding the past • A version of this paper is forthcoming in Transactions in GIS Dr. Ian Gregory

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