Much is involved in the organisation of a large event and a lot of things have to be taken into consideration. An important aspect is general safety. For this reason, police services use imagery early in the process when preparing an event. Visual information about the location of the event, including street photographs (cycloramas) as well as high-resolution aerial photographs, is an important aid in deciding how to deploy emergency services and crowd management.
Photographs can be used to see the layout of streets and squares. High risk locations such as bars and youth hangouts can be identified quickly and easily. With this insight it is possible to determine the best locations for road blocks, and it increases security during the event.