Photogrammetry & Special Instrument
Photogrammetry, Advantage & Disadvantage of Photogrammetry, Types of Photogrammetry- Terrestrial Photogrammetry (Horizontal Photograph), Aerial Photogrammetry. Difference Between a Map and An Aerial Photograph, Types of Photographs- Vertical Photograph, Oblique Photograph. Terminologies in Aerial Surveying– Scale of Photograph, Datum Scale of Photograph, Average Scale of Photograph, Flying Height, Crab, Drift. Ground Co-Ordinates & Length of a Line From a vertical Photograph, Relief Displacement, Area Covered By One Photograph, Number of Photograph Required to Cover an Area – 1.When No overlap is Present, 2.When overlap is Present (Longitudinal & Side)- (I). When Total Ground Area (A) is given, (II). When Length & Width are given of total Ground, Exposure Interval, Air Base.
Topics
A theodolite is an important instrument used for measuring horizontal and vertical angles in surveying. The system of surveying in which the angles (both horizontal & vertical) are measured with the help of a theodolite, is called Theodolite surveying.
In plane table surveying we details discuss accessories used in plane table surveying, alidade, tripod, level tube, compass, plumbing fork, setting up the plane table: centering, levelling, orientation, method of plane table survey.