| Abstract: | A map is a representation of the Earth, or part of it. The distinctive characteristic of a topographic map is that the shape of the Earth‘s surface is shown by contour lines. Contours are imaginary 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 steepness of slopes. |
| Genre: | USGS Unnumbered Series |
| ProdID: | 70039571 |
| Citation Author: | U.S. Geological Survey |
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| Citation Language: | English |
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| Citation Online Only Flag: | Y |
| Citation Phsyical Description: | HTML Document |
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| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | Monograph |
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| Citation Search Results Text: | Topographical map symbols; 2000; USGS Unnumbered Series; U.S. Geological Survey |
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| Citation Year: | 2000 |
| Type: | citation/reference |
| Text: | Topographical map symbols; 2000; USGS Unnumbered Series; U.S. Geological Survey |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://egsc.usgs.gov/isb/pubs/booklets/symbols/ |
| Date Other: | Sun, 1 Jan 2012 15:49 -0600 |
| Publisher: | U.S. Geological Survey |
