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

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

Tag Cloud

Single Vehicle Accidentnighttime visibility studyReconstructionMonte Carlo MethodComplete Analysis9.75 millionLitigation DeclarationsCapital CrimeMistrialGunshot Wound Modelingnorthern california chapterCACBody CameraCDAA Winter ConferenceMedicalMuni Bus On-Board Camera SystemShadowFEWA Secretaryhot topicdepositionVehicle 3D Laser ScanVehicle Crush Analysissacramento settlementby eyeAutopsy ReportMarco Topete Murder3Officer Involved ShootingTrace back to shooter's locationForensic AnimationObjectionsCrosswalkCamera Lense Field of ViewVideo AlignmentShadow AnalysisPeer-Reviewedcrash scene mappingExhibits FoundationNews Vanforensiclargest infant death settlement in californiaLitigationProfessional AssociationExpert's PreparationSurgicalTrajectoryPhysical EvidenceDavid vs. Goliath Case3D AnimationVariancesCalifornia Association of Accident Reconstruction SpecialistsFerguson MOSan Francisco Intersection402 HearingLaser Assisted Photogrammetry$84,000,000 VerdictsVideo Capture Frame RateCriminalistfilmTiming and Location of EvidenceTImeline from AudioFirst Degree MurderCACLDAR15Crush Analysis1000 HoursNietoCCSFCalTransevidence documentationLaser ScanningcollaborativeAnalysisDriver's Eye View ObstructionRadio TrafficGPS AnalysisFieldworkCalifornia Association of Crime Lab DirectorsseachaoComplex Accident Scene ReconstructionError AnalysisSide BarsAssault RifleFEWA911 CallCamera Lense DistortionExplosionreconstruction analysisOhio vs TensingTrajectory Rods3D crime scene mappingOISDetermine Degree of ErrorCross ExaminationBallistic StudyWorld Forensic FestivalShooter's LocationWitness StandCA2RSForensic Expert Witness AssociationConstruction AccidentPhotogrammetry7 Days on Witness Stand3D Working ModelDriver's Eye VideoEye WitnessDr Judy MelinekSurgical Animationforensic mappingDefenseCrosswalk in ShadowNew Forensic TechnologyDemonstrative ExhibitsIncident and Exemplar Vehicles.223PlaintiffCNNShootingbody camera for deputies and officersThe Working ModelTestimonySeoul KoreaDetermine Driver's Eye ViewCDAAAnimation over VideoWitness TestimonySight Obstructionsaccident reconstructioninfant death settlementSpecific Calculations2014 Annual Conference7.6 Mile PursuitEyeNational Newsforensic expertVisibility Studies.45 CaliberForensic Science InternationalBus vs. Pedestrian3D Animation and Video Compositing3d VisualizationBallistics Analysisanimation3D Laser ScanningExcellent PresentationsWire Strike3D Animation over Nighttime VideoCalifornia District Attorneys AssociationCraig FriesRay TensingNieto VerdictCone of UncertaintyNighttime VideoCalifornia Association of CriminalistsExemplar Life Sized IntersectionISO 17020Illustrate Driver's Eye ViewExpert's AnalysisConstruction WorkerOld Way vs Best WayMichael Brown911 Call AudioSam DuboseSouth Lake TahoeRadiologicalOperator LiabilityVideo AnalysisRadio Traffic AudioDownstream Benefits of 3D Laser Scanningforensic consultantExpert WitnessBallistic Trajectory AnalysisMeasurementsprofessionalEmergency Deployment RecordersNighttime Accident ReconstructionGuilty VerdictTrace Back AnalysisPower Line Wire StrikeMedical AnimationconsultantPhotometry3D Gunshot Wound Path ModelPersonal InjuryAccidental ShootingReporter InjuredLaser Scanscientific evidenceVisible Geometry


Archive