In an indirect method of contouring, the best method of interpolation of the contour isa)By graphical methodb)By estimationc)By arithmetical computationd)All of theseCorrect answer is option 'C'. Can you explain this answer?

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In an indirect method of contouring, the best method of interpolation of the contour is

a)
By graphical method
b)
By estimation
c)
By arithmetical computation
d)
All of these

Correct answer is option 'C'. Can you explain this answer?

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In an indirect method of contouring, the best method of interpolation...

Indirect Method of Contouring

Indirect methods are quicker, cheaper and less laborious than the direct method.

In this method, a series of guide points are selected along with a system of straight lines and their elevations are determined.

These points are then plotted, and contours are drawn by interpolation.

Three methods used for interpolation are as follows:

i) By Estimation

This is a rough method and is used on a small-scale map.

ii) By Arithmetic Calculations

This is a very accurate method but a tedious one. The position of contours points between guide points is located by arithmetic calculations.

iii) By Graphical Method

This is a rapid and convenient method and gives higher accuracy than the estimation method. However, it involves a lot of interpolation work.

Note:

Arithmetical Calculation is considered more accurate than a graphical method, as the graphical method assumes only linear variation between the two guide points.

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In an indirect method of contouring, the best method of interpolation of the contour isa)By graphical methodb)By estimationc)By arithmetical computationd)All of theseCorrect answer is option 'C'. Can you explain this answer?

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