Geography Reference
In-Depth Information
4.2.
The QVIZ User Interface presenting information about the city of Tartu, the home
of the Estonian National Archives, and the administrative units that covered it at dif-
ferent dates. Just as with Carisbrooke in figure 4.1, there has been a complex sequence
of historical units. The earliest unit listed here, Luunja, covered Tartu from 1503 to 1866.
This interface was created by teams at AS Regio (Estonia) and the University of Umeå,
accessing a data structure created by the GBH GIS team.
units, and 251,260 relationships between these units. It includes 83,706
boundary polygons, but only 40,626 units have associated polygons:
units have multiple polygons because of boundary changes.
W hile figure 4.1 shows something very different from a traditional
GIS, the system can do far more for units that have associated polygons.
Figure 4.2 shows the interface developed for our data structure by the
QVIZ project, which allows nonexpert users to identify historical units
