Geographical Systems (1998) 5: 139-162.
Network-based Constraints-oriented Choice Set Formation using GIS
Mei-Po Kwan and Xiao-Dong Hong
Abstract:
This paper is concerned with
choice set formation in the intraurban context where choice alternatives
explicitly involve the spatial dimension. Its purpose is to develop an
operational GIS method for generating more restrictive spatial choice sets
through incorporating the space-time and cognitive constraints of an individual into the framework. The
main construct proposed, which was formulated
in set-theoretical terms, is the cognitive feasible opportunity set
(CFOS). A set of network-based GIS procedures were developed using ARC/INFO GIS
to operationalize the formulation. An example drawn from a travel diary data set
collected in Columbus, Ohio, is used to examine implementation issues. The paper
concludes that, without a realistic representation of the travel environment,
the spatial configuration of choice sets and the alternatives they contain could
be very different from what individuals actually experienced in their daily
lives.
Keywords: choice set, cognitive map, constraints, destination choice, GIS
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