Photogrammetry is the process of obtaining measurements from images. Image measurements are being used to provide useful information about the course of events and the size of items and persons in a crime scene. The two most commonly reported forensic activities that involve photogrammetry are human height analysis and accident analysis of motor vehicles.
If photogrammetry is requested, include the dimensions of the scene to the nearest 1/8 inch and include a diagram or print from the surveillance film indicating the location of the measurements. Include one diagram or print for every angle used in the scene.
Some measurements can be made in an uncalibrated image if you can determine vanishing points and the horizon
Calibration targets allow views of flat surfaces to be rectified. Rectified views allow measurements to be taken
