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A USGS topographic map is usually named for the most prominent feature within the bounds of the map, frequently a community. Most topographic maps are named for the most centrally located, well-known, and/or largest community labeled on the map. If the community for which the map should be named falls on two or more maps, a directional term ...
Nov 14, 2024 · 5.5 Contour Lines and Intervals. A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or difference in elevation between contour lines. Index contours are bold or thicker lines that appear at every fifth contour line. If the numbers associated with specific ...
This is because when contours are close together, it means that the slope is steeper. For a quick definition, a contour line joins points of equal and constant values. For example, contours on an elevation have constant heights that are the same on each line in a topographic map.
Oct 30, 2024 · Contour lines are lines drawn on a topographic map to indicate ground elevation or depression. They are used to represent the shape and features of the land. The vertical distance or difference in elevation between contour lines is known as the contour interval. Index contours, on the other hand, are bold or thicker lines that appear at every ...
Topographic Mapping and the USGS. A longstanding goal of the USGS has been to provide complete, large-scale topographic map coverage of the United States. The result is a series of more than 54,000 maps that cover in detail the entire area of the 48 contiguous States and Hawaii. Produced at a scale of 1:24,000 (some metric maps are produced at ...
Aug 28, 2023 · Contour mapping is a technique used in cartography and geography to represent the three-dimensional shape and elevation of the Earth's surface on a two-dimensional map. Contour maps display lines called "contour lines" that connect points of equal elevation above a reference datum, typically mean sea level. These lines help visualize the topography and relief of a region, making it easier to ...
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Contour lines, or lines which connect points of equal elevation, are drawn on a topographical map in order to quantify the elevation at any point on the map. Where contour lines are spaced closely together (A) it means that the topography is very steep. Where the lines are spaced farther apart (B) it means that the terrain is more gently ...
