ABSTRACT
This chapter discusses a basic task encountered very often in spatial analysis: measuring distance and time. After all, spatial analysis is about how the physical environment and human activities vary across space-in other words, how these activities change with distances from reference locations or objects of interest. In many applications, once the distance or time measure is obtained, studies may be completed outside of a GIS environment. The advancement and wide availability of GIS have made the task much easier than it was in the past.
