A Spatial Decision Support System (SDSS)
for Electoral Districting
What is a SDSS?
- A computational system for generating “interesting alternative
sets of electoral districts”
- Designed to control the properties of each set of districts
generated by the model
- Users specify their “optimal criteria” (defined below)
and the SDSS then generates a new set of electoral districts
- Users can add spatial constraints–for example, the boundaries
of electoral districts must fall within provincial or state boundaries; electoral
districts must not cross natural features such as rivers and lakes or mountains.
compactness with spatially uniform distribution of voters.
Note: There is no trade-off
between equality and compactness.
Compactness is sacrificed to
achieve equity with a spatially non-uniform distribution of voters (Rushton,1972).
|Note: Darker areas have higher
densities of population, therefore the constituency areas are smaller.
Lower density areas have larger constituency areas, but less regular
shapes and more sinuous boundaries.
Copyright © 2001 by
Joel D. Barkan, Paul Densham and Gerard Rushton