CFP Scene Reconstruction & Photogrammetry Flashcards
6 cards from real CFP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CFP Scene Reconstruction & Photogrammetry flashcards as text
What is the role of a 3D laser scanner (LiDAR) in crime scene reconstruction, and how does it complement photography?
Answer: It captures millions of precise distance measurements to create a point cloud model of the scene, providing measurable geometry that photographs alone cannot supply
LiDAR generates dense point clouds with sub-millimeter accuracy, which can be merged with photographic textures to create fully measurable virtual scene reconstructions.
When photographing tire impressions at a crash scene, what specific information does the impression width measurement provide for reconstruction?
Answer: It helps identify the vehicle class and tire type, which in turn informs track width and axle load estimates for reconstruction
Tire width measurements can be matched to manufacturer databases to identify compatible vehicle types, aiding reconstruction engineers in determining the involved vehicle's characteristics.
Why is 'overlap' critical when capturing sequential photographs intended for photogrammetric stitching?
Answer: Overlapping areas (typically 60–80%) provide matching tie points that software uses to align images and calculate accurate 3D geometry
Photogrammetry software identifies common features in overlapping regions to calculate camera positions and reconstruct accurate 3D geometry from the image set.
In forensic scene mapping, what is the key distinction between a 'rough sketch' and a 'finished diagram'?
Answer: A rough sketch is a freehand field drawing made at the scene, while a finished diagram is a scale-accurate drawing prepared later for official reports and court use
Rough sketches capture field measurements and observations, while finished scale diagrams, often produced with CAD software, meet evidentiary standards for courtroom presentation.
What technology combines GPS coordinates directly with photographic images to create georeferenced crime scene documentation?
Answer: GPS-enabled cameras or drone systems that embed location data in EXIF metadata, allowing images to be precisely placed on a geographic map
GPS-tagged imagery embeds latitude/longitude in EXIF data, enabling photos to be automatically positioned on GIS maps for spatial analysis and scene reconstruction.
When performing photogrammetric reconstruction from archived crime scene photographs not originally captured for that purpose, what is the greatest limitation?
Answer: The lack of control points (known measurements or reference markers) in the original images reduces measurement accuracy
Without surveyed control points or scale references in the original images, photogrammetry software cannot establish an accurate real-world coordinate system, limiting measurement precision.