Reading Topographic Maps
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Reading Topographic Maps

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Reading Topographic Maps Reading Topographic Maps Presentation Transcript

  • Topographic Maps
  • Topographic Maps: Map that shows the physical characteristics of an area. Natural : rivers, streams, mountains Man-made : roads, railroad tracks, bridges and buildings
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  •                            1:250,000 scale, 1 inch represents about 4 miles                            1:100,000 scale, 1 inch represents about 1.6 miles                            7.5 minute 1:24,000 scale, 1 inch represents 2,000 feet
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  • Contour line: line that connects points of the same elevation Elevation: height above sea level
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  • Contour interval: shows the same change in elevation from contour line to contour line (represented by a number) Index contour: typically every 5th contour line, usually bolder or darker and it will have a number
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  • 75 50
  • 1400 1450
  • The slope of land is shown by the closeness of the contour lines. Lines close together: steep slope; lines far apart; gentle slope
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  • Full circle : shows the top of a hill, highest point; called the “summit” Often an “X” represents the actual elevation at that point
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  • Full circle with short lines in it (hachures) represents a “depression” (downward change in elevation)
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  • Color map: Green: land Blue: water Black: anything man made (buildings, roads, bridges, railroad tracks) Pink: areas of high density White : uninhabited areas
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