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Photogrammetry

Photogrammetry       I

We make measurements from photographs using overlay techniques
which can be strikingly accurate at a glance.

    

In the above example, our use of a 3D computer scale model of an accident truck
"bends" to match the accident photo,
thus proving that the dashboard moved back to hit the seatbelted driver.

Photogrammetry       II

Analog techniques of determining measurements of skidmarks and other objects from accident scene photographs. Analog techniques involve overlapping measurement grids included in a comparison photograph taken from the same viewpoint as the accident photo. The result is usually more accurate than purely mathematical approaches, and is easily understood by any viewer. The following is an example of using overlapping photos to accurately reconstruct an accident scene. The berm, the PG&E Plant, road edge, etc. are exactly positioned in each photo. This allowed the jury to access the accuracy of the reconstruction.
Lights of
PG&E Plant


Right wheel
mark in dirt

Gouge on berm
Right wheel path



PG&E Plant

Left wheel path
(relative to right)

Gouge location


Reconstruction of
right wheel path
CHP PHOTO RECONSTRUCTION
OF ACCIDENT SCENE


The CHP photo disolving into
the overlap of the reconstructed
gouge and skidmark.
TRANSITION

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