ABSTRACT
This chapter discusses one of basic tasks encountered most often in spatial analysis: measuring distances and time. After all, spatial analysis is about how physical 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 a GIS environment. The advancement and wide availability of GIS have made the task much easier than it used to be.
