Crime Scene Group Cental 3D-Evaluation

Crime Scene GroupCental 3D-Evaluation

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Central 3D-EvaluationCriminal Police Office (LKA) Baden-Württemberg

Sandra Petershans

Baden-Württemberg• 10,6 Mio. inhabitants• approx. 36.000 km² • 44 towns and rural districts • 1.111 municipalities

The police in BW• approx. 32.000 staff members• approx. 26.700 police officers

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Crime scene investigation unit(Referat 706b)

The unit is subdivided into two remits

General crime scene investigation work:

Crime scene work on the occasion of major incidents

Evidence recovery and collection of evidence on exhibits

Forensic examination of motor vehicles

Identification of falsified motor vehicles

Investigatiing the possibilities of ovbercoming immobiliser systems

Use of special auxiliary tools and evidence collection methods


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Fields of work of the Central 3D Evaluation Unit:

Survey of crime scenes

Tachymetry/GPS

Photogrammetry

and hopefully - in future - by means of a laser scanner

Soft parts and evidence surveys

Stripe light projector

Measurement of perpetrator height


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Tools employed for conduction crime scene surveys

We also use classical measuring methods such as tachymetrymainly -for outdoor crime scenes -in wodden areas / inaccessible terrain

Trimble 3300DR


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GPS(also in combination with the digital map of the land surveying office)

Garmin 76S


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Rangefinder

Disto classic

Range: 200 mAccuracy: 3 mm


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Rollei d 507 metric

Photogrammetric process


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Multi image evaluation

The images are taken from different positions and angles.


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Example of an outdoor crime scene:

Stabbing in a parking lot near a discotheque


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Images taken from a turnable ladder at a height of approx. 10m


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Rollei image


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2D Evaluation

Top view

with marks on the cars


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Zoom


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Manual image coordinate measurement

Rollei CDW programme


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Polygon or point measurement


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DXF - Transfer into the CAD programme

CAD programme: Bentley Microstation


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Crime scene in a supermarket


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Scaled sketch with list of the exhibits drawn up by the competent forensic expert


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Bloody shoeprint

rectified with Rollei MSR


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Description:

Coded light stripes are projected on wounds, injuries or objects. The objects with light stripes are photographed with colour cameras and processed to 3D data.

Stripe light topometry


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Animation programme

3ds max


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Despite the bad scales a rectification was possible.


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Advantages of the 3D-measuring technology

• Hands-free measuring procedure.

• No complex manual measurement on the scene.

• Useable for indoor and outdoor purposes.

• Very accurate 3D model of the crime scene.

• Every measurement can be taken from the 3D model.

• Output as a 2D or 3D plan.

• Scientifically verified and accepted in court.

• May be combined with tachymetry.


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Thank you for your Attention

Sandra Petershans


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Sandra Petershans

Crime Scene Group Cental 3D-Evaluation

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