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Objectives: -Explain how topographic maps use contour lines to show elevation

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Chapter 3 Section 3 Topographic Maps (note to teacher: have topographic map ready and don’t close it until lecture is over). Objectives: -Explain how topographic maps use contour lines to show elevation -Describe topographic map symbols

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Chapter 3 Section 3Topographic Maps (note to teacher: have topographic map ready and don’t close it until lecture is over)

Objectives:

-Explain how topographic maps use contour lines to show elevation

-Describe topographic map symbols

-Demonstrate how to use topographic maps to determine the shape of the land, the flow of rivers, and distance

topography
Topography -
  • The natural and human-made surface features of an area.
topographic maps
Topographic Maps
  • Common type is the 7.5 minute map commonly called a quadrangle, that spans 7.5 minutes of latitude and 7.5 minutes of longitude
  • Topographic Map of Sedona
7 5 minute map
7.5 Minute Map
  • Has a scale of 1:24,000
    • (one inch represents 2,000 ft.)
topographic maps con t
Topographic Maps Con’t
  • Contour lines – narrow brown lines that indicate elevation
  • Topo
  • Contour Interval – The difference in elevation between consecutive contour lines.
  • contour interval 40
calculating contour interval
Calculating Contour Interval
  • Subtract 2 adjacent bold contour lines and divide by the number of lines
  • 200-100=100
  • 5 contour lines
  • 100/5=20
  • C.I. = 20 ft
slope
Slope
  • The distance between one contour line and the next indicates steepness.
  • Contour lines that are close together = steep
  • Contour lines with space between them = gradual
  • Rise/Run = average slope
bench marks
Bench Marks
  • The exact location where elevation is known and noted on a brass or aluminum plate which is permanently set into the ground
  • On a map it is noted with “BM” next to a X with the elevation given.
  • benchmark
spot elevations
Spot Elevations
  • Elevations of road forks, hilltops, lake surfaces, and other points of interest.
  • Marked with small crosses “+”
  • spot elevations
understanding symbols
Understanding Symbols
  • Contour lines that form circles indicate hills or mountains
  • Depression contours indicate a depression in the landscape
other features
Other features
  • Contour lines that cross a river from an arrow which points toward the source
  • Human made features are depicted in black
  • Thickly settled regions are pink
magnetic declination
Magnetic Declination
  • The angle by which a compass needle will vary from true north
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