1- Flight planning, : Photographic overlaps, Flying altitude, Required number of photographs, (both methods), Time interval between exposures, Crab and drifts, Data required for flight planning, Numerical problems from question paper, Ground control for photogrammetry, Radial line method of plotting (Arundel's Method), 2 - Stereoscopy and Parallax in photogrammetric surveying, Parallactic angle, lens stereoscope, Parallax in aierial stereoscopic views