In recent years, spatial
problems such as site location selection, shortest route selection,
and resource distribution plan are easy to see in our life. The
definition of SDSS can take many forms. But it is generally
agreed that SDSS is evolved from DSS and defined as a DSS
which combines geographic information with appropriate
algorithms and extend these capabilities to provide a rational
and objective approach to spatial decision analysis, a more vivid
graph expression than DSS