Keyword Analysis & Research: a topographic show


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Frequently Asked Questions

What is a topographic map?

Geological Survey topographic maps usu­ ally represent elevations and laNdforms--the shapes into which the earth's surface is sculp­ tured by natural forces--by contour lines.

When is a map said to have good topographic expression?

When the contour lines are drawn so that they represent the typical characteristics of the ground surface, the map is said to have good topographic expression. On the other hand, the 3 See Chapter 1 B 4, Accuracy specifications for topographic mapping.

Which features are usually noticed on a topographic map?

The fi rst features usually noticed on a topographic map are the area features, such as vegetation (green), water (blue), and densely built-up areas (gray or red).

What is a contour on a topographic map?

Contours are imag- inary lines that join points of equal elevation on the surface of the land above or below a reference surface, such as mean sea level. Contours make it possible to measure the height of mountains, depths of the ocean bottom, and steep- ness of slopes. A topographic map shows more than contours.


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