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Question
Which of the following is NOT a method in the interpolation of contours?
A.
Geometric method
B.
Estimation method
C.
Arithmetic method
D.
Graphical method
Answer ( Option A)

Geometric method

Solution

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. 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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