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Question
Which colours are used on toposheets? What is their significance?
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Solution
Six colours are used in a survey map to show various features. They are as follows:
Black: All names, river banks, broken grounds, dry streams, surveyed trees, heights and their numbering, railway tracks, telephone and telegraph lines.
Yellow: All cultivated areas.
Green: All wooded/forested areas, scattered trees and scrubs.
Brown: Contour lines, their numbering, stony waste, sand features.
Blue: All water bodies, where they contain water.
Red: Grid lines and their numbering, roads, cart tracks, settlements, huts and other buildings. Note: Sometimes we find white patches here and there to show barren lands.
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(g) Give the drainage patterns of the following:
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(o) What is the mode of transport? Give reasons for your answer.
Study the extract of the Survey of India Map Sheet No. 45D/7 and answer the following questions:
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(c) (i) What does 3r in the grid square 8895 mean?
(ii) What do you mean by 20r in the grid square 8994?
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(ii) What is the general direction of the Varkanala?
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