Oblique Imagery for Security
For the recent high-profile APEC forum in Sydney, Australian government agencies were supplied with the latest development in aerial imagery to enhance security and emergency response operations. This was the first time that spatially-correct oblique imagery had been used as a visual intelligence tool in Australia. The technology deployed was Pictometry®.
The ability to develop security plans for events or to react more effectively in situations requiring a tactical response has been made easier through the adoption of Pictometry. This technology comprises a digital capture component (five calibrated and synchronised digital cameras) in combination with a user interface for data access and analysis.
The most valuable feature of oblique imagery is its perspective. Suddenly a flat box representing the roof of a complex in a photo mosaic is a two storey building, which you can look at from all directions with a few mouse clicks (refer to examples, right). The algorithms behind Pictometry allow line of sight, building height and security perimeter 3D measurements. In oblique imagery you can more clearly see features and determine which ones will obstruct the view from street level and which ones could provide cover. Building entrances and fire escapes for access and egress are clearly visible. Obliques put tactical support staff into the physical environment instantly providing real ’situational awareness’ with safety.
Oblique images have been of enormous benefit when dealing with night time incidents. Often, ‘first responders’ will drive by the location in an effort to identify a building or house in the dark. With oblique images, responders can be advised of details that can not be seen in the dark, or what is on the roof or inthe back lane.
Other valuable products can be derived from this oblique imaging, including 3D city models which fuel a range of other applications and form the basis of simulations and fly-throughs. Councils in Sydney and Melbourne will soon be recipients of this powerful imagery.
Without a doubt, the growing use of oblique aerial images worldwide is having an impact on emergency management operations.
