The Accuracy of Photogrammetry vs. Hands-on Measurement Techniques used in Accident Reconstruction

Randles, Bryan C.; Welcher, Judson; Szabo, Thomas J.; Elliott, David; MacAdams, Cameron

doi:10.4271/2010-01-0065

Cited by 38 publications

(24 citation statements)

References 19 publications

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“…Frontal collisions are defined as having a PDOF of 11, 12, or 1 o'clock, while rear impacts are defined by a 5, 6, or 7 o'clock PDOF. The use of photographs, damage repair estimates, data from the vehicle's event data recorder, or vehicle crush profiles can all be used to establish the Dv and PDOF (74)(75)(76)(77). Vehicles that sustain little or no damage are typical of minor, low-speed collisions in which the Dvs are generally <10 miles per hour (mph).…”

Section: Underlying Biomechanical Principlesmentioning

confidence: 99%

Clinical Significance of the Seat Belt Sign as Evidence of a Compromised Occupant–Seat Belt Relationship

Greenston

Wood

Reinhart

2019

The Journal of Emergency Medicine

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Section: Underlying Biomechanical Principlesmentioning

confidence: 99%

Clinical Significance of the Seat Belt Sign as Evidence of a Compromised Occupant–Seat Belt Relationship

Greenston

Wood

Reinhart

2019

The Journal of Emergency Medicine

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“…Randles et al [17] compared traditional technique and photogrammetry for measurement of targeted damaged vehicle. The points on each vehicle were measured using both techniques, and compared.…”

Section: Issues On Accuracymentioning

confidence: 99%

Rapid 3D Modelling of an Existing Building using Photos

Liu

Kang

2014

Proceedings of the International Symposium on Automation and Robotics in Construction (IAARC)

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-A three-dimensional (3D) laser scanner is one of the most well known devices when it comes to creating a 3D model of existing bridges and buildings. Most 3D scanners can pick up point clouds very accurately, which can be used to create an accurate 3D model of existing objects. One may speculate that a 3D laser scanner can also be used to pick up the status of a construction project on the job site and transform them into a 3D computer model. However, most 3D laser scanners are still expensive and they are not easy use yet especially on a congested construction site. In addition, it takes a significant amount of time to create a 3D computer model using point clouds picked up by the laser scanner. As emerging photogrammetry techniques demonstrated the use of photos instead for rapid 3D modelling, one may be wondering 1) if this technique can be used to create a 3D model of a construction site quickly, and 2) if this model is accurate enough to help project managers make some decisions. This paper presents our test demonstrating the process of creating a 3D model of an existing building using photos. It presents some challenges we faced when taking photos and creating a 3D model. This paper also presents the method we came up with to create a 3D model of the entire building without using any control points.

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“…The impact dynamics can be reconstructed by applying the basic principles of mechanics [13,25], on the basis of the data coming from the positions of the vehicles at rest and other data measured at the accident site and on the vehicles. Such models require a large number of parameters, referring to the vehicles and the environment, which can be only roughly estimated [3,38]. In particular, among others, the parameters that mostly affect the resulting motion of the vehicles are the pre-impact speed, the direction of travel, the position of the impact point [20,39], the crush coefficients [23,26,43], the coefficient of restitution [8,32,44] and the friction coefficient of the tyres on the road [2,16,41,42].…”

Section: Introductionmentioning

confidence: 99%

The effect of mass properties on road accident reconstruction

Gobbi

Mastinu

Previati

2013

International Journal of Crashworthiness

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The paper investigates the influence of vehicle mass properties (mass, centre of gravity location, inertia tensor) on accident reconstruction. Considering the case of two colliding vehicles, the paper aims at defining which is the uncertainty of each mass property that should be prescribed to obtain an accurate accident reconstruction. The paper is divided into two parts. The first part presents a mathematical model, and its validation, able to perform a proper computation of the motion of vehicles before and after crash with the data that are usually collected by operators after the accident. In the second part, a theoretical analysis shows that an accurate accident reconstruction does need accurate measurements of both the centre of gravity location and the moment of inertia of crashed automobiles. Even a small error of 10% on the estimated value of the moment of inertia of one car or of an error of 100 mm in the location of its centre of gravity can lead to errors of close to 20% on the reconstructed velocities of the two cars before the accident. An existing test rig for measuring the centre of gravity location and the inertia tensor of crashed vehicles (pre-and post-impact), meeting the measurement accuracy determined on the basis of the sensitivity analysis, is presented.

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The Accuracy of Photogrammetry vs. Hands-on Measurement Techniques used in Accident Reconstruction

Cited by 38 publications

References 19 publications

Clinical Significance of the Seat Belt Sign as Evidence of a Compromised Occupant–Seat Belt Relationship

Clinical Significance of the Seat Belt Sign as Evidence of a Compromised Occupant–Seat Belt Relationship

Rapid 3D Modelling of an Existing Building using Photos

The effect of mass properties on road accident reconstruction

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