GARY E. KILPATRICK AND ASSOCIATES, PA GARY E. KILPATRICK AND ASSOCIATES, PA
FORENSIC ENGINEERS
Accident Reconstruction and Product Liability Analysis
Gary E. Kilpatrick and Associates, PA utilizes iWitness Close Range Photogrammetry software for accident scene photogrammetry when necessary.
IWitness software is utilized to create roadway contour and measurement for accident scene situation mapping and vehicle crush damage recording and measurement for vehicles involved in a traffic accident.
The iWitness photogrammetry software system enables an engineer to convert photographic two-dimensional (x,y) coordinate information into three-dimensional (x,y,z) coordinates via a process called “photogrammetric bundle-triangulation”. Scene photographs can be taken by the engineer at the accident site for the purpose of a reconstruction effort utilizing a consumer grade digital camera and aided by specially designed target markers, which are placed in the cameras field of view during the field photography process. At the scene, the engineer typically hand measures via tape, one or more actual distances between two objects, such as the target markers for use as photogrammetric scaling. These scene photographs are then uploaded into the iWitness software on a computer and common features are referenced to each other, (a process called “conjugate point referencing”) where the iWitness software automatically calculates three-dimensional coordinates to very high-level accuracy.
Digital camera images taken by law enforcement or other individuals at the time of the accident can also be uploaded into the iWitness software and measured if certain conditions are met for photogrammetrical processing. If certain intrinsic camera information is known in the images, or can optionally be derived in iWitness from the photographs, (namely the lens focal length, image format size in pixels and lens distortion) the engineer can often measure critical evidence that wasn’t measured at the time of the initial investigation, be-it months or even years after the incident.
The iWitness photogrammetry software system has been successfully used in US
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