Contour Interval

The difference in elevation between successive contour lines on a given map is fixed. This vertical distance between any two contour lines in a map is called the contour interval (C.I.) of the map. Figure 17.1(a) shows contour interval of 1m whereas Figure 17.1(b) shows 10m.

The choice of suitable contour interval in a map depends upon four principal considerations. These are:

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