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What do you mean by Vertical Interval (V.I.) in a topo sheet ?

Answer»

The vertical distance between two consecutive contour lines on a topographical map is called as Vertical Interval (VI). They are drawn at fixed intervals and do not change on the map. This interval depends on the scale of the map and the range of elevation in the area of the map. 

Example : VI in all topo sheets of 1 : 50,000 is 20 m.



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