forensic mapping analysis - stevenaverycase.org...total station data retrieval total station data...
TRANSCRIPT
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Forensic Mapping
Analysis
05-R-71-CASOWisconsin State Patrol Academy
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Education / Training
Trooper Timothy Austin
Technical Reconstruction Unit
Wisconsin State Patrol Academy
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Objective of Analysis
� Forensically map (measure) the locations and terrain in andadjacent to the Avery Salvage Yard located on Avery Road inManitowoc County, Wisconsin.
� Based on measurements recorded at the location, preparescaled scene diagrams of the property.
� Where applicable, generate three dimensional scene modelsand subsequent animations.
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Request for Services / Timeline
� The Wisconsin State Patrol received a request on November 5,
2005 from local law enforcement officials to provide security
services and forensic mapping assistance at the Avery property.
� Forensic Mapping activities continued until November 12, 2005,
with later evidentiary items being measured in 2006 and 2007 at
the Calumet County Sheriff’s Department.
� In total, over 4100 measurements were recorded either manually
or with the assistance of electronic measuring devices.
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Geodimeter
610 Total
Station
Electronic Distance
Measuring System
Theodolite (Angle
Measuring System)
Data Collector
Prism
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Forensic Mapping – Incident Scene
� Total Station measures thedistance, vertical angle, andhorizontal angle to the prism,thereby measuring in threedimensions.
� Information is then stored in the
data collector for later retrieval.
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Total Station Data Retrieval
� Total Station data collector is
connected to a laptop computer,
where recorded measurements are
retrieved.
� Raw data is then transferred to a Computer-Aided Drawing
(CAD) software program for the creation of scaled scene
diagrams.
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Total Station Accuracy
� Maximum Total Station
induced angular error is
given as 3 seconds.
� Maximum shot distance was
approximately 1200 feet,
which calculates to a
maximum induced error of
less than .5 inch.
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Forensic Mapping Location(s)
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Forensic Mapping Location(s)
Avery Auto
Salvage Yard
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Forensic Mapping Location(s)
Avery Auto
Salvage Yard
“Deer Camp”
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Forensic Mapping Location(s)
Avery Auto
Salvage Yard
“Deer Camp”
Kuss Road
Cul-de-Sac
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2-D Orthogonal Views
� CADZone professional drawing software was utilized togenerate two-dimensional diagrams of the entire Avery AutoSalvage Yard property.
� Two-dimensional views look directly down on the locationto show positions or buildings, vehicles, or items ofevidentiary value.
� With the entire property being mapped and drawn, it ispossible to look at specific locations in detail.
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2-D Orthogonal Views
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2-D Orthogonal Views
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2-D Orthogonal Views
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2-D Orthogonal Views
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2-D Orthogonal Views
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2-D Orthogonal Views
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2-D Orthogonal Views
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2-D Orthogonal Views
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2-D Orthogonal Views
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2-D Orthogonal Views
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Distance – RAV4 to Crusher
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2-D Orthogonal Views
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2-D Orthogonal Views
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2-D Orthogonal Views
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Distance Measurements
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2-D Orthogonal Views
� 2-D views are limited in that we cannot examine variousperspectives other than directly overhead.
� Because the total station measures in three-dimensions, it ispossible to add height to the objects depicted in theorthogonal drawings.
� The Forensic3D software package was therefore used toprepare scaled scene models in three dimensions in order tosupplement the original 2-D drawings.
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Rhinoceros
� Rhinoceros allows the user to create three dimensional models by
diagramming in 3D space.
� By adding height data to the diagram, it is easier to see and
understand the spatial and geometric relationships between objects.
� Forensic3D also allows the user to assign texture maps to three
dimensional models.
Forensic3D
&
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Texture Mapping
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3D Modeling Locations
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3D Modeling Locations
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
Interior Models
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
Interior Models
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Incident Scene Model(s)
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Additional Garage Measurements
� Additional measurements concerning the garage wereprovided by the Calumet County Sheriff’s Department.
� In a report documenting activities between March 1, 2006and March 2, 2006, Deputy Steier recorded measurements ofspecific items seized by law enforcement officers.
� Items listed included:
� Evidence Marker 9: a bullet fragment located 14’10” west of theeast wall and 20’6” north of the south wall.
� Evidence Marker 23A: a bullet fragment located 8’9” west of theeast wall and 12” north of the south wall.
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Incident Scene Model(s)
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3-D Models vs. Photography
� A photograph is an accurate representation of the scene as it wasobserved when the picture was taken. A 3-D model is a map(diagram) of the scene showing a scaled geometric perspective.
� 3-D Models show spatial relationships that photographs cannot:� Removing roofs such as that on the Steven Avery residence.
� Hiding or “turning off” objects such as the air compressor over EvidenceTag 23A in the garage.
� A photograph offers a limited view, while witnesses andinvestigators can see angles in 3-D models not otherwise available
to them.
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
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Incident Scene Model(s)
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Measurements
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Measurements
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Skeletal Models
� Using a CAD file of a female skeleton provided by the FBI,a series of skeletal models were created using theForensic3D software package.
� All skeletal models were created under the directsupervision of Forensic Anthropologist Dr. Leslie Eisenberg.
� Meeting with Dr. Eisenberg at the Dane County Coroner’s Office inMadison.
� Electronic submission of skeletal models for approval by Dr.Eisenberg.
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Animation
� Movement in a scene is shown through a series of stillimages (30 per second).
� To create an animated “walk through” of the areas modeledin 3-D, over 5250 rendered images were used.
� Final animated files were saved for DVD format andplayback.
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