Ogden, Utah - 7.5 Minute Series Topo Map National Audubon Society On the basis of measurements

On the basis of measurements

Precise directions

Preceded only by Lewis and Clark

These documents are the same as the published map except for minor changes approved by the author

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Ogden, Utah - 7.5 Minute Series Topo Map National Audubon Society On the basis of measurementsThe 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. A topographic map shows more than contours. The map also includes