|Fig. Contour Lines|
The main elements of Contouring are :
- Contour Line
- Contour Interval
- Horizontal Equivalent
Contour Interval is the vertical distance between any two consecutive contours as shown in the figure above. Suppose a map having contour lines of 100 m, 97 m, 94 m, and so on. The contour interval for the contour lines will be 3 m here. The interval in the contour line generally depends upon (i) The nature of the ground surface, (ii) The scale of the map prepared, and (iii) the purpose of the survey.
The horizontal equivalent is the horizontal distance between any two continuous contour lines. It is not constant and varies according to the steepness of the ground. For steep slopes, the horizontal equivalent is narrow while for flatter slopes it is wide.
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