what does blue dot in toposheet represents?
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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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Reading Topo Maps: Understanding Map Symbols and Colors
RED -Overprinted on primary and secondary roads to highlight them. ...
BLACK -Manmade or cultural features.
BLUE -Water-related features.
BROWN -Contour lines and elevation numbers.
GREEN -Vegetation features.
WHITE -Sparse or no vegetation. ...
PURPLE -Denotes revisions that have been made to a map using aerial photos.
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