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Cards In This Set
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Topographic Map
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Two-dimensional (flat) representation (model) of a three-dimensional land surface (landscape)
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What do topographic maps show?
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Landforms (hills, valleys, slopes, coastlines, gullies) and their relief
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Relief
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Difference in elevation
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How does a topographic map show a landforms relief?
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By using contour lines to represent elevations of hills and valleys
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Contour lines are distinguishing features of a topographic map; they are what makes it different from
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The familiar planimetric map (highway map) which has no contour lines
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Topographic maps are a valuable tool in geological and engineering studies because
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Of their three-dimensional aspect
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Most United States topographic maps are published by the
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U.S. Geological Survey (USGS)
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Most topographic maps depict _____ called _____
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Rectangular sections of the Earth's surface; quadrangles
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Quadrangle
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A section of the Earth's surface that is bounded by lines of latitude at the top (North) and bottom (South); and by lines of longitude on the left (West) and right (East)
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Contour lines
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Indicated locations of equal elevation (generally above sea level
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Latitude
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- is measured from 0 at the Equator to 90 N or 90 S
- place location in northern or southern hemisphere |
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Longitude
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- is measured in degrees East or West of the prime meridian
- place location in eastern or western hemisphere |
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For finer measurements, latitude and longitude degrees can be subdivided into _____ called _____
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60 equal subdivisions; minutes (') --- [can be divided into 60 equal subdivisions called seconds (")]
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What is the most common size for quadrangle maps to be published in?
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15-minute and 7.5-minute quadrangle maps (15 minutes of latitude by 15 minutes of longitude; 7.5 minutes of latitude by 7.5 minutes of longitude)
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Each 15-minute quadrangle map can be divided into ____ 7.5-minute maps
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