Caught in the Act! Part Three

Mar 18, 2015

3D Laser Scanning – Determining & Illustrating Driver Eye View Obstructions:

In the reconstruction of vehicle accidents, particularly vehicle versus pedestrian cases, one of the issues that often arises is the portion of the scene that the pedestrian was visible to the driver in the moments immediately before impact. A common point of analysis is the so-called “Last Chance to Avoid” point for the driver of the vehicle. How much of the pedestrian, or other vehicle, was visible to the driver at this last chance point and position?

Often there are obstructions present to the drivers line of sight to the object impacted. These obstructions can be from objects in the environment outside the vehicle, such as telephone poles, street signs and foliage adjacent to the roadway and impact location. Other times the obstructions to the driver’s line of sight come directly from features within the vehicle itself. This is very common when commercial vehicles are involved. In a recent Bus vs. Pedestrian case, PSI devised a very accurate and repeatable method to determine and illustrate these obstructions. By utilizing 3D laser scan data and the 3D Working Model, it is possible to quantify the effect of these obstructions and illustrate how they impact the driver's view out on the roadway dynamically, as the objects and vehicles move over time towards impact.

In the recent case where a MUNI bus struck and injured the pedestrian crossing against the light, given the size and close proximity of the bus, (40 feet long, 8 feet wide, 8.5 feet high, the first vehicle in line and approximately 10 feet away when the pedestrian entered the street), it is certain that the bus was available to be seen by the pedestrian. However, the bus driver’s view towards the unexpected late crossing pedestrian is not as certain. The bus itself blocks the driver’s sight to portions of the roadway around the bus. The combination of these obstructions and the pedestrian’s 4’11” height may limit her visibility to the driver. Using the previously captured laser scan data, PSI created a 3D Working Model of the bus interior and driver’s eye position in order to analyze the issue.

Performing this task in the computer via the 3D Working Model has two distinct benefits: the precision and adjust-ability afforded by the computer and the ability to analyze it in context of the environment, derived motions and physical evidence of the virtual accident scene. Visualizing the results in connection with the accident reconstruction and signal timing elements allows a more detailed picture of the dynamic issues at play during the event. By modeling the bus interior and the driver’s eye position, the 3D Working Model creates visible geometry around the bus indicating which areas are not visible to the bus driver. By attaching this visible geometry to the 3D model of the bus as it moves, we can see the interplay between the line of sight obstructions and the position of the pedestrian as she crosses in front of the bus.

SiteLines.jpg

Read the Entire Case Study



Category:

Craig Fries

user_avatar

Craig Fries is the Founder and President of Precision Simulations, Inc., the foremost forensic analysis and animation firm in the US. In this role he has created or directed over 1,000 3D forensic animations for use in criminal and civil litigation and has maintained a 100% record of non-exclusion at trial. As a pioneer in the field of forensic laser scanning, Craig created the first 3D animation based upon laser scan data ever admitted at trial in the US, and has been at the forefront of the use of the technology in homicide and accident investigation since.


Add Pingback

Please add a comment

You must be logged in to leave a reply. Login »

Category List


Tag List

Crush Analysis (1)
Seoul Korea (1)
ISO 17020 (1)
Explosion (1)
Expert Witness (3)
Crosswalk in Shadow (1)
First Degree Murder (1)
Personal Injury (1)
Forensic Science International (1)
Shooting (1)
Variances (1)
Cone of Uncertainty (1)
Reconstruction (1)
body camera for deputies and officers (1)
Timing and Location of Evidence (1)
reconstruction analysis (2)
3D crime scene mapping (2)
collaborative (1)
infant death settlement (1)
Laser Scan (4)
Animation over Video (1)
film (1)
animation (1)
Objections (1)
Camera Lense Distortion (1)
Testimony (3)
Capital Crime (1)
forensic expert (1)
Eye (1)
evidence documentation (2)
Muni Bus On-Board Camera System (1)
Defense (2)
National News (1)
Ballistics Analysis (5)
Complex Accident Scene Reconstruction (3)
Shadow (1)
Plaintiff (2)
Analysis (1)
Operator Liability (1)
Nighttime Accident Reconstruction (2)
Reporter Injured (1)
Medical Animation (1)
Trace back to shooter's location (1)
Error Analysis (1)
Criminalist (1)
Witness Testimony (1)
Medical (1)
Radiological (1)
Ferguson MO (1)
Single Vehicle Accident (1)
Marco Topete Murder (2)
nighttime visibility study (3)
Shooter's Location (1)
World Forensic Festival (1)
accident reconstruction (2)
Laser Scanning (3)
Excellent Presentations (1)
Cross Examination (2)
Incident and Exemplar Vehicles (1)
Side Bars (1)
CCSF (1)
1000 Hours (1)
3D Working Model (18)
Visibility Studies (2)
Mistrial (1)
Photogrammetry (3)
Crosswalk (1)
Litigation Declarations (1)
forensic mapping (1)
largest infant death settlement in california (1)
3D Animation (10)
3d Visualization (6)
Peer-Reviewed (2)
9.75 million (1)
911 Call Audio (1)
Video Capture Frame Rate (1)
Video Alignment (1)
Sam Dubose (1)
seachao (1)
FEWA Secretary (1)
Witness Stand (1)
Litigation (1)
Power Line Wire Strike (1)
Nighttime Video (2)
Old Way vs Best Way (1)
Downstream Benefits of 3D Laser Scanning (1)
consultant (1)
sacramento settlement (1)
Officer Involved Shooting (3)
Surgical (1)
deposition (1)
TImeline from Audio (1)
Dr Judy Melinek (1)
CDAA (1)
.45 Caliber (1)
3D Gunshot Wound Path Model (6)
Bus vs. Pedestrian (1)
scientific evidence (1)
News Van (1)
CAC (1)
Video Analysis (2)
The Working Model (3)
3D Laser Scanning (18)
Physical Evidence (1)
Construction Worker (1)
by eye (1)
Forensic Expert Witness Association (1)
forensic (1)
Guilty Verdict (1)
northern california chapter (1)
Specific Calculations (1)
Determine Driver's Eye View (2)
CACLD (1)
professional (1)
Determine Degree of Error (1)
Sight Obstructions (1)
Emergency Deployment Recorders (1)
Exhibits Foundation (1)
.223 (1)
CA2RS (1)
Vehicle Crush Analysis (1)
David vs. Goliath Case (1)
Gunshot Wound Modeling (3)
FEWA (1)
Shadow Analysis (1)
California Association of Criminalists (1)
Professional Association (1)
California Association of Accident Reconstruction Specialists (1)
California District Attorneys Association (1)
OIS (1)
South Lake Tahoe (1)
GPS Analysis (1)
Laser Assisted Photogrammetry (2)
Autopsy Report (2)
Driver's Eye Video (4)
Radio Traffic Audio (1)
Photometry (2)
Complete Analysis (1)
CDAA Winter Conference (1)
402 Hearing (1)
San Francisco Intersection (2)
Surgical Animation (1)
Accidental Shooting (1)
Driver's Eye View Obstruction (3)
Nieto Verdict (1)
Exemplar Life Sized Intersection (1)
Vehicle 3D Laser Scan (1)
California Association of Crime Lab Directors (1)
Illustrate Driver's Eye View (1)
Expert's Preparation (1)
CNN (1)
$84,000,000 Verdicts (1)
Visible Geometry (1)
Measurements (1)
Forensic Animation (1)
Trajectory Rods (2)
Construction Accident (1)
Wire Strike (1)
Ray Tensing (1)
Eye Witness (2)
Expert's Analysis (1)
Ohio vs Tensing (1)
CalTrans (1)
Camera Lense Field of View (1)
Ballistic Trajectory Analysis (7)
forensic consultant (1)
Nieto (1)
Fieldwork (1)
Trace Back Analysis (1)
911 Call (1)
New Forensic Technology (1)
AR15 (3)
Body Camera (1)
2014 Annual Conference (1)
Trajectory (1)
7 Days on Witness Stand (1)
Radio Traffic (1)
3D Animation and Video Compositing (3)
7.6 Mile Pursuit (1)
Assault Rifle (2)
Monte Carlo Method (1)
3 (1)
3D Animation over Nighttime Video (2)
Craig Fries (1)
hot topic (1)
crash scene mapping (1)
Demonstrative Exhibits (1)
Michael Brown (1)
Ballistic Study (3)

Tag Cloud

RadiologicalIllustrate Driver's Eye ViewDriver's Eye View ObstructionWitness StandEmergency Deployment Recorders9.75 millionForensic AnimationCalifornia Association of Accident Reconstruction SpecialistsDriver's Eye VideoMeasurementsDefensedepositionbody camera for deputies and officersprofessionalError AnalysisComplex Accident Scene ReconstructionCalifornia Association of CriminalistsDemonstrative ExhibitsCriminalistFieldworkOld Way vs Best WayOfficer Involved ShootingNews Vanreconstruction analysisMuni Bus On-Board Camera SystemanimationVisible GeometryBus vs. PedestrianEye Witness7.6 Mile PursuitWorld Forensic Festival3D Working ModelBallistic Trajectory AnalysisCapital CrimeMedical AnimationCNNaccident reconstructionNational Newscrash scene mappingforensicTiming and Location of EvidenceAnalysisShadowISO 17020Body CameraShadow AnalysisAccidental Shooting.45 Caliberforensic expertSurgical AnimationAutopsy ReportExcellent PresentationsNieto VerdictExemplar Life Sized IntersectionConstruction WorkerVisibility Studieshot topicconsultantnorthern california chapterReporter InjuredTrace back to shooter's locationIncident and Exemplar VehiclesPhotometryPersonal InjuryExpert's AnalysisThe Working ModelFirst Degree MurderSan Francisco Intersectionby eyeFerguson MODownstream Benefits of 3D Laser ScanningCamera Lense DistortionCA2RSCACLDGunshot Wound ModelingCrosswalk in ShadowDavid vs. Goliath Case3D Animation over Nighttime VideoLaser Assisted PhotogrammetryMichael BrownPeer-ReviewedNietoVideo Alignmentlargest infant death settlement in californiaPower Line Wire StrikeDetermine Driver's Eye Viewforensic mappingShootingCalifornia District Attorneys AssociationSide Barscollaborativeforensic consultantTrace Back AnalysisVariances3D Animation and Video CompositingVehicle Crush AnalysisCraig FriesAR15Trajectory Rods3D Gunshot Wound Path ModelTrajectoryCCSFVehicle 3D Laser ScanNighttime Video402 HearingExplosionevidence documentationfilm911 Callinfant death settlementProfessional AssociationAssault RifleCamera Lense Field of ViewVideo AnalysisSingle Vehicle Accident$84,000,000 VerdictsPlaintiffShooter's LocationCross ExaminationFEWABallistics AnalysisCACExpert's PreparationCDAAOperator Liability3D Laser ScanningLaser ScanningExhibits FoundationOISBallistic StudyOhio vs TensingRadio TrafficSurgicalGPS AnalysisSpecific CalculationsFEWA Secretarynighttime visibility studyPhotogrammetryMistrialVideo Capture Frame RateSight ObstructionsSam Dubose3Wire StrikeLitigationCrush AnalysisEyeComplete AnalysisCrosswalkseachaoNighttime Accident ReconstructionCalifornia Association of Crime Lab DirectorsMedicalForensic Expert Witness AssociationNew Forensic TechnologyTestimonyCDAA Winter ConferenceMonte Carlo MethodReconstruction1000 HoursDr Judy MelinekWitness TestimonyDetermine Degree of ErrorLaser ScanRadio Traffic AudioTImeline from Audio3d VisualizationConstruction AccidentGuilty VerdictExpert WitnessSeoul Korea.223911 Call Audioscientific evidenceAnimation over VideoSouth Lake TahoePhysical EvidenceRay TensingObjections3D AnimationLitigation Declarations2014 Annual Conference3D crime scene mappingsacramento settlementCone of Uncertainty7 Days on Witness StandMarco Topete MurderForensic Science InternationalCalTrans


Archive