tccmap

topographic mapping
1.0x

tccmap

Created 3 years ago

Duration 0:12:03
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Slide Content
  1. Models of the Earth

    Slide 1 - Models of the Earth

  2. Technological Advances in Map Making

    Slide 2 - Technological Advances in Map Making

    • Air photos and satellite images relate to actual 3-D landforms
    • Satellite technology gives an even broader view of Earth by gathering data from broad areas of Earth’s surface.
  3. Difference between geomagnetic and geographic poles

    Slide 11 - Difference between geomagnetic and geographic poles

    • The angle between the geomagnetic and the geographic
    • poles is called magnetic declination.
  4. Scales

    Slide 13 - Scales

    • Map scales show the relationship between the distance on the map and the actual distance on the Earth.
    • Fractional scales indicate how much
    • the map has been reduced from actual
    • size, this is a 1:24,000 scale
    • Graphic or bar scale is divided into segments that show the relationship between actual distance on the map and distance on Earth
  5. Topographical Maps

    Slide 14 - Topographical Maps

    • Show the surface features or topography of the land
    • Contours lines are used to show elevation
    • Contour interval is the distance between each line
    • Index contour are bolded lines that give the elevation
  6. Lines close together indicates steep terrain

    Slide 18 - Lines close together indicates steep terrain

    • Lines far apart indicates gradual change
    • V shape indicates valleys with a river flowing toward the open end of the V
    • Depressions are indicated by hachured lines
  7. Drawing Topographical Maps

    Slide 22 - Drawing Topographical Maps

  8. Gradient

    Slide 23 - Gradient

    • = Drop in elevation between 2 points
    • Distance between two points
    • 20 = 4 m/km
    • 5
  9. 1. What is the contour interval for this map?

    Slide 24 - 1. What is the contour interval for this map?

    • 2. What is the distance between points E and F?
    • 3. What direction does Cedar River flow?
    • 4. What is the gradient between points D and E?
    • 5. Which side of hill C has the steepest slope?
    • 6. What is the elevation of the last depression line
    • on hill B?
  10. Now the Fun begins…read this map and tell me

    Slide 26 - Now the Fun begins…read this map and tell me