491 Samuel Nájera Bailón Spacial analysis of video surveillance... Figure 9. Isochronal representation of the dispersion achieved by a subject within seconds of leaving the Plaza de Sol at an average pace of 4 km/h. Source: prepared by the author. Many simulations of different movements have been carried out with a view to determining the maximum reaction threshold, in terms of time, that law enforcement bodies can afford to take. By way of example, movement on foot at a speed of 4 km/h, a pace that does not jar with the passive crowd as a whole, is seen to generate the following dispersion. On the basis of this mapping, we are able to obtain a set of conclusions concerning the geographical area subject to perimeter control. Firstly, the temporal centroid of the central district is located slightly towards the east. Heading this way, the subject would be outside the perimeter within less than 600 seconds after having left the Puerta del Sol. This contrasts with times for other directions where we see 1400 seconds for a northwards direction, 1200 seconds for southwards and 1500 seconds for westwards. This is all assuming that transit is unhindered. On the other hand, the direction that is most likely to be used as an escape route is that with the highest density of strategic surveillance CCTV cameras. This characteristic tactically provides a comparative advantage as the first step in the protocol for action http://revista.ieee.es/index.php/ieee
REVISTA IEEE 5
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