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Chapter 6 3
 

Chapter 6 3

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    Chapter 6 3 Chapter 6 3 Presentation Transcript

    • Chapter 6-3 Maps
    • What Are Maps???
      • models of the Earth’s surface presented on paper!
    • Projections
      • Many maps are made as projections
            • when points and lines on a globe’s surface are transferred onto paper
      ***All types of projections distort the shapes of landmasses or their areas ***
    • 1) Mercator Projection
      • mainly used on ships
      • project correct shapes of continents, but the areas are distorted
    • Mercator
      • lines of longitude are projected onto the map parallel to each other.
      • This creates a distortion.
      • - only lines of latitude
      • are truly parallel-
    • Mercator
      • because of this areas at the poles appear bigger than they are on this type of projection
          • example – compare Greenland to either S. America or India
    • 2) Robinson Projection
      • shows accurate continent shapes and more accurate land areas
      • lines of latitude run parallel (as they should) and lines of longitude are curved as they are on a globe
    • Robinson
    • Robinson
      • there is less distortion near the poles
    • 3) Conic Projection
      • used to produce maps of small areas (road maps, weather maps)
      • made by projecting points and lines from a globe onto a cone
      • most useful for middle latitude regions, less useful for polar regions
    • Conical
    • Geologic Maps
      • useful to Earth scientists
    • Geologic Maps shows the arrangement of rocks at the Earth’s surface
    • Geologic
      • - used to find and extract natural resources
    • Three Dimensional Maps
      • often created with computers
    • 3d Maps
    • Remote Sensing
      • techniques used to collect information about Earth from a distance, often using satellites
      • Landsat satellites take pictures of Earth’s surface using different wavelengths of light
      • images can be used to make maps such as amount of snow cover, or impact of forest fires
      • Global Positioning System (GPS): uses 24 satellites sending position and time signals to allow a person to calculate his or her exact position.
    • GPS
      • send radio signals
      • used to navigate,
      • create detailed maps,
      • track wildlife