|Implemented for CHGIS Version 1.0 Datasets, uses a simple flat table to store attributes that were current in the year 1820 for each historical place. No differentiation of time, since all records are current for the year 1820. Each level of the superior units in the administrative heirarchy are repeated in the table for each record.||Temporal Change is recorded in the Phase Two model by adding a new record for each instance of historical change. So for every change in placename, admin status, or location, a new record is added. In addition, the rank in the administrative hierarchy is shown with the PARTOF field, which contains the SystemID of the jurisdictional unit that contains the record. A separate Temporal Sequence Table allows for tracking change over time.||An experimental spatio-temporal database system was designed as a theoretical exercise for handling non-synchronous changes in different attribute domains. The basic idea is to separate the various attributes that change independently of one another (such as name changes, admin status changes, and spatial footprint changes) into separate classes or tables, and to relate these variables to one another by creating an entity for a place, or "place object."|
|11-15-02 Phase Two: Implemented Diagram (4 pages, 2-3 are blank, in English)(PDF)|
|11-28-01 Phase Three: Experimental Diagram (4 pages, color-coded, in English)(PDF)|
|01-03-02 Phase Three: Experimental Diagram (in Simplified Chinese) (JPG)|
11-15-02 Phase Two (implemented): "Simplified Spatio-Temporal Data Model for CHGIS"
01-08-02 Phase Three: (experimental) "CHGIS Time-Continuous Data Model, Minimum Required Tables (Chinese Version)"
11-14-01 Phase Three: (experimental) "Gazetteer Development for the CHGIS"
10-8-01 Phase Three: (experimental) "Relational Data Model for Spatio-Temporal GIS Allowing for Attributes with Independent Temporal Extents."
|Related Papers and Presentations|
9-18-01 Phase Three: (experimental) "Solution to the Parent-Child Multiple Problem in the Spatio-Temporal Database Design for the CHGIS Project,"
Lawrence Crissman (DOC)
9-9-01 Phase Two: (proposal) "CHGIS Database Model - Frozen Attributes for each Temporal Extent"
9-9-01 Phase Two: (proposal) "Zoujin shuzihua Zhongguo lishi dili xinxi xitong (CHGIS) 1820 nian shuju jianjie," [Going Digital - A brief introduction to the China Historical GIS 1820 database],
1-20-01 Phase One: (experimental) "Toponyms and Feature Classifications for CHGIS"
12-10-00 Phase Three: (proposal) "CHGIS Draft Database Design and Geocoding System"
|12-12-01 Phase Three: experimental Vietnam Provinces (sample Gazetteer version, ACCESS database)(ZIP)|
|Links to Other
|ongoing Great Britain Historical GIS - the first and foremost historical GIS project (HTML)|
|ongoing Historical GIS for 200 Years of Belgian Territorial Structures - probably the most practical implementation of spatio-temporal GIS so far (PDF)|
|ongoing MurMur - seeks to integrate spatio-temporal datase models with visualation tools (HTML)|
|ongoing National Historical GIS - a new and ambitious project to produce county level polygons for the United States(HTML)|
|ongoing Perceptory Univ of Laval - a spatio-temporal database and visualization tool (HTML)|
|2001 Modelling Change and Events in Dynamic Spatial Systems with Reference to Socio-Economic Units - solid introduction to spatial change processes (PDF)|
|Nov 2001 TRIPOD Spatio-Historical Object Model - spatio-temporal model and queries for historical objects (PDF)|
|Jun 2001 Digital Historical Maps - scanned map archive (HTML)|
|Jun 2000 Mapping Europe's Historic Boundaries and Borders - a rogue's gallery of the major historical GIS researchers in Europe today (HTML)|
|Apr 2000 STEM Temporal GIS - based on LOIS, a commercial temporal GIS product (HTML)|
|Dec 1999 Temporal Support for Land Information Systems in Object-Oriented Modeling - an overview of spatio-temporal modeling in OOP(PDF)|
|Nov 1999 Spatio-Temporal Conceptual Models: Data Structures + Space + Time - one approach to spatio-temporal modeling (PDF)|
|Apr 1999 An Area Event System for Forest Managment History - a useful attempt to hack stand histories into ArcInfo (PDF)|
|1998 A Qualitative Representation of Evolving Spatial Entities in Two-Dimensional Topological Spaces - detailed look at the requirements for Spatio-Temporal modeling (HTML)|
|Apr 1991 Temporal Relations in GIS - an early look at problems in dealing with changing places over time (HTML)|