In this case, to find out the intermediate points elevation, contour intervals are used. In a large map, index contour lines are less to keep it simple to read the map easily. A higher contour interval is used for a large area and small contour interval for small area. When a large area is to be mapped in small piece of paper contour intervals are used. Uses of Contour Intervals in Surveying
NoNo measurement or scaling is required since the contour levels are indicated on the contour linesThe distance must be measured on the map and converted to actual distance by multiplying with the scale of the mapIn a given map the contour interval is a constantThe horizontal equivalent varies with slope.
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