State Direct & indirect method of contouring.Explain tacheometric method.

State Direct & indirect method of contouring.Explain tacheometric method.
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1 Answer

Answer :

Method of contouring are:

1.Direct method

2 Indirect methods which include

a)by cross section b)by squares c) tachometric contouring method.

Tachometric contouring method.

1.This method is most suitable when a contour map of a hill is required. In this method instruments used is tachometer or a transit theodolite equiped with stadia diaphragm.

2.To begin with a no. of lines are set out at a given angular interval and the representative points are located in the field by observing i) the vertical angles and ii) the stadia readings

3 The horizontal distance between instrument and staff station and RLs of staff stations ares calculated by tacheometry formulae.

4 The survey is plotted and then contour lines are interpolated. 
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Description : State any four characteristics of contours with sketches.

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State any two situations under which tacheometry is preferred.

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Description : State any four uses of transit theodolite.

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