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...R t u g i jaipur subject surveying ce civil engg iii sem unit tacheometry and photogrammetry prateek sharma blown up detail introduction instrument used classification of stadia tangential application advantage disadvantage principle types aerial photographs relief displacements tilt flight planning is the branch survey in which horizontal vertical distances points are obtained by instrumental observations such as staff intercepts angles theprocessofmeasuring horizontaldistance eliminated less accurate but more rapid bestuseful case rough difficult terrain primaryobjective preparation contour maps or plans usedinhydrographic surveys location etc instruments tacheometer a transit theodolite fitted with diaphragm frame upon mounted crosshairs to give definite line sight hairs lines pair provided addition regular each on this equidistant from central hair commonlyusedstadiadiaphragms shown here...