This document provides an overview of aerial photogrammetry techniques including mosaics, mirror stereoscopes, and parallax bars. It defines mosaics as assemblies of overlapping aerial photographs. Mosaics are classified as controlled, uncontrolled, semi-controlled, strip, wet, or index. Mirror stereoscopes are used to view stereo pairs of photographs and measure parallax. Parallax bars allow measurement of parallax differences between points to determine flying height and elevation differences.