ABSTRACT
The analysis of street networks is often conducted by treating them as though the network lay on a flat, two-dimensional surface. In reality, street networks lie on a three-dimensional surface, that is, there are height variations. The historical part of Istanbul, for example, is famous for its rich topography, including its seven hills, and its urban form should be analyzed by taking into account its topography. This chapter illustrates the analysis of networks on a three-dimensional surface using the geographic information system (GIS), based on the work of Asami et al. (2002).
