CRIME SCENE MODELING

• Manual crime scene modeling  is a basic form of a crime scene modeling. Based on measurements from crime scene we are modeling every detail we think is important in specific shooting incident. We can use photographs as a template for modeling or we can  start modeling on basis of a traditional top view sketch.                                                   

  Advantage of this approach is in a fact that we are free to choose any viewpoint of “camera” so we can observe a shooting incident from every viewpoint and also we can animate the ”camera” itself. 

  Disadvantage of this approach is in amount of work needed to manually model the crime scene itself. Final result is always an approximation of the reality because we decide what is important in the specific shooting case and what details could be abandoned.
  Disadvantage of this approach could be resolved by use of a TERRESTRIAL PHOTOGRAMMETRY PROGRAMS that helps us make exact 3D model of a crime scene based on a sequence of overlapping photographs of crime scene...

   
• In order to get extremely precise and fast 3D model of a crime scene itself we can use a combination of a COMPUTERIZED GEODETIC EQUIPMENT (total station) and LASER SCANNER. Modern laser scanners can scan a whole crime scene (200-300 m) in a minutes with average precision in centimeters or even in millimeters. Later, in office we import that 3D model in our 3D software and continue with reconstruction. This is a must have for complicated cases (crime scene in mountains or similar) where  we want to reconstruct shooting case during deer hunt for example and we must have exact 3D model of a hill in mountains. 

  In next example exact 3D model of a terrain up in a mountains is generated by use of a Total Station and data exported in dxf format to CAD/CAM program. "Camera" shows crime scene from different viewpoint. Red balls denotes positions of a suspect, a victim and a deer in a particular instant of time. 

      (369 KB, please be patient)

  (move the cursor over the video window)

  (in order to see animations on this web page go to DivX page and download DivX codec ( 500 K).

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