The aim of this paper is to express the application of tracking technologies in Urban Design and Planning. Tracking technologies can
be used to monitor different user groups in different occasions. Since 2005, TU Delft has explored and developed two types of research
using GPS to collect spatio-temporal data in urban environments : (1) visitors of city centers and (2) households in specific
district, specific street or specific types of buildings. The collected data can be used for analyzing, visualizing and understanding how
the city functions and how people perceive the city.