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Understanding Maps-

Understanding Maps-. Cartography. The Olde World. Maps vs. Globes. 2 dimensional Flat Distorted Shows small details Handy/can fold. 3 dimensional Spherical More accurate Shows large details inconvenient. Map vs. Globe. Which is bigger … Greenland, Mexico or Australia.

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Understanding Maps-

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  1. Understanding Maps- Cartography

  2. The Olde World

  3. Maps vs. Globes • 2 dimensional • Flat • Distorted • Shows small details • Handy/can fold • 3 dimensional • Spherical • More accurate • Shows large details • inconvenient

  4. Map vs. Globe

  5. Which is bigger … Greenland, Mexico or Australia

  6. Map Projections • Mercator • Gnomonic/Azimuthal • Conic

  7. MERCATOR PROJECTION • Made as if you wrapped a cylinder around a globe • Parallels and Meridians appear as straight lines • Accurate at equator • Distorted at poles

  8. Gnomonic/Azimuthal Projection • Made as if paper touched one point on globe • Useful for air travel/navigation • Accurate at point of contact • Uneven spacing between parallels

  9. Conic Projection • Made by placing paper cone over globe • Cone touches along one parallel • Accurate at that point • Used for mid latitude navigation • Many sections-polyconic

  10. GREAT CIRCLE • Any circle that divides the globe into 2 equal halves • Useful in navigation • Shows the shortest distance between 2 points

  11. Reading a Map • LEGEND—symbols used to interpret a map (see p 60) • MAP SCALE- indicates the relationship between distance on a map and distance on Earth A) GRAPHIC B) FRACTIONAL C) VERBAL

  12. GRAPHIC SCALE • Shows a printed line divided into parts and labeled • You can measure distance with a ruler and compare to line

  13. Fractional Scale • States the map scale as a ratio • Ex.: 1:24 000 means one unit on the map equals 24000 units on the Earth

  14. Verbal Scale • Makes a written statement in words expressing the scale • Ex.: “One centimeter equals one Kilometer” Ex. : “One inch equals 5.2 miles.”

  15. They all mean the same thing.

  16. Topographic Map Scales

  17. http://academic.brooklyn.cuny.edu/geology/leveson/core/wayne_web/distance%20and%20direction/scale-direction-ex2.htmhttp://academic.brooklyn.cuny.edu/geology/leveson/core/wayne_web/distance%20and%20direction/scale-direction-ex2.htm

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