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
In theory of errors we details discuss theory of errors, occurrence of error, type of error, gross errors or mistakes, systematic or cumulative errors, accidental or random errors, precision, accuracy, true value, true error, most probable value (M.P.V), principle of least square, residual error, law’s of weights, probable error, error in computed result.
In setting out of circular curve we details discuss offsets from long chord, offset from tangent, offset from chord produced in linear method & tape & theodolite/rankine method / tangential / deflection angles, two theodolite method, tachometer method in angular method.