3-D Impression
Definition
A three-dimensional impression in a soft medium (mud, sand, soil, snow). Photographed in situ with scale and oblique light, then cast with dental stone.
Related terms
- 2-D Impression
- A two-dimensional print on a hard, flat surface (tiled floor, polished cement, paper). Lifted with electrostatic dust lifter (ESLA), gel lifter, or...
- Class Characteristic
- A feature shared by an entire group of objects (every shoe of one model has the same sole tread; every tire of...
- Dental Stone
- A gypsum-based casting material harder and finer than plaster of Paris. Preferred for forensic 3-D casts because it captures detail at the...
- Drag Factor (μ)
- The effective coefficient of friction between the tyre and the road surface during a braking event. Used in the skid-mark speed formula....
- Gait Pattern
- The geometric and rhythmic signature of a person's walk. Captured as stride length, step length, cadence, foot angle and walking line. Used...
- Individual Characteristic
- A characteristic unique to a specific typewriter unit arising from manufacturing variation or service wear; used to identify or eliminate a specific...
- TWI
- Treadwear indicator. A small raised ridge moulded across the tread groove of every tire at 1.6 mm depth. When the surrounding tread...
Explained in
- Track Marks: Foot, Shoe, Tire, Skid Marks and Gait PatternA three-dimensional impression in a soft medium (mud, sand, soil, snow). Photographed in situ with scale and oblique light, then cast with dental stone.