3.1 Data collection
At the moment, GPS is the most accurate and reliable source for
outdoor collection of spatio-temporal data on an urban scale.
Other technologies are less accurate, more expensive, and less
frequent or require equipment to be installed in the build environment.
For GPS-tracking, only a high-sensitive receiver is
needed.
Within the method developed GPS-tracking method, TU Delft
distinguishes two types of research: (a) Visitors and (b) Inhabitants.
These types differ in way of working, duration and target
groups. Both types of researches have their own goal (Spek et
al, 2009).