1. Why are colours used in topographical sheets? Mention the uses of blue, green, white and black colours in them.
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Answer. Answer: The color brown is used to denote most contour lines on a map, which are relief features and elevations. Topographic maps use green to denote vegetation such as woods, while blue is used to denote water features like lakes, swamps, rivers, and drainage.
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Topographic maps may use different colors to represent area features.
Black: All names, river banks, broken grounds, dry streams, surveyed trees, heights and their numbering, railway tracks, telephone and telegraph lines.
Green: All wooded/forested areas, scattered trees and scrubs.
Blue: All water bodies, where they contain water.
White: Sometimes we find white patches here and there to show barren lands.
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