Using remote sensing methods, the indicator can be measured in a cost-effective way in an unlimited number of cities. Research has shown that two main different approaches are used to measure this indicator (the degree of urbanization and the urban extent) that has very strong connections to other goals and targets. Although participation itself can be explained in different manners, no one denies the involvement of different actors in urban affairs is critical to build consensus and to take the most appropriate and informed actions. This data, which is mostly generated using spatial analysis technologies, is greatly challenging the traditional notion of the city unit and its boundaries, which were used to generate urban data.