Topographic maps

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Transcript

  • 1. Topographic Maps
  • 2.
    • Topographic maps model the changes in Earth’s elevation.
  • 3. How are topographic maps useful?
    • Determine your location relative to identifiable natural features
    • Topographic maps also indicate cultural features such as roads, cities and dams
    • Often used by hikers
  • 4.  
  • 5.  
  • 6. What is a contour line?
    • A line on a map that connects points of equal elevation.
  • 7. What is a contour interval?
    • The difference in elevation between two side-by-side contour lines.
    • This # is constant for each map
  • 8. What can you tell from contour lines?
    • Contour lines that are close together = steep elevation
    • -Mountains, ridges, valleys
    • Contour lines that are far apart =
    • slight change in elevation.
  • 9. What is an index contour?
    • A contour line that is marked with the elevation number.
  • 10. How are index contours useful?
    • You can determine the elevation of other lines around the index contour by adding or subtracting the contour interval number.
  • 11. Contour lines always point upstream on rivers.
  • 12. Basins and craters are represented with hachures
  • 13. What do different colors indicate on topo. Maps?
    • Green = area with vegetation
    • White = area with little to no vegetation
            • Cities, deserts, etc.
    • Purple = dark - revisions to the map
    • light - urban areas
  • 14. Map Scales
    • The relationship between the distances on the map and distances on Earth’s surface.
    • Scale is often represented as a ratio.
    • Example: 1:80
      • This means that one unit on the map represents 80 units on land.
      • The unit of distance could be feet, miles, millimeters, etc.
  • 15.  
  • 16. Map Legends
    • Topographic maps and most other maps have a legend.
    • A map legend explains what the symbols used on the map mean.
    • Some frequently used symbols on topographic maps are shown in the appendix in the back of your book on
    • p. 806
  • 17.  
  • 18.  
  • 19.  
  • 20. Map Series
    • A map series includes maps that have the same dimensions of latitude and longitude.
    • For example, one map series includes maps that are 7.5 minutes of latitude by 7.5 minutes of longitude.