Maps And Globes Are Models Of The Earth

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Maps And Globes Are Models Of The Earth

  1. 1. 1.2 Maps and globes are models of Earth.
  2. 2. Maps show natural and human-made features. <ul><li>Any map you use is a flat model of Earth’s surface, showing features as seen from above. </li></ul><ul><li>A globe represents Earth as it is seen from outer space. It shows relative sizes and shapes. </li></ul>
  3. 3. Land Features on Maps <ul><li>A relief map shows how high or low each feature is on Earth. </li></ul>mountains plateaus plains
  4. 4. <ul><li>Mountains- stand higher than the land around them. A group of mountains is called a mountain range . A group of mountain ranges is called a mountain belt . </li></ul><ul><li>Plateaus- have fairly level surfaces but stand high above seal level. Often found near mountain ranges. </li></ul><ul><li>Plains- gently rolling or flat land features. The U.S. has two types of plains: coastal and interior . </li></ul>
  5. 5. Scale and Symbols on Maps <ul><li>The maps most often used are road and city maps. </li></ul>
  6. 6. <ul><li>A map scale relates distances on a map to actual distances on Earth’s surface. A scale can be expressed as a ratio, a bar, or equivalent units of distance . </li></ul>
  7. 7. <ul><li>A map legend , also called a key, is a chart that explains the meaning of each symbol used on a map. </li></ul>compass rose
  8. 8. Latitude and Longitude show locations on the Earth <ul><li>Latitude is based on an imaginary line that circles the Earth halfway between the north and south poles called the equator . </li></ul>
  9. 9. <ul><li>Latitude is a distance in degrees north or south of the equator, which is 0 degrees. </li></ul>* Notice that the north and south poles are at 90 degrees N and south latitude.
  10. 10. <ul><li>Longitude is a distance in degrees east or west of the prime meridian , which is 0 degrees. The prime meridian stretches from the north to the south pole through Greenwich, England. </li></ul>* You can find a location by noting where latitude and longitude lines cross.
  11. 11. Global Positioning System (GPS) <ul><li>A network of 24 satellites that find the latitude, longitude, and elevation of any site. </li></ul><ul><li>A computer inside a receiver uses the satellite signals to calculate the user’s exact location. </li></ul><ul><li>Used by: pilots, drivers, sailors, hikers, and map makers. </li></ul>
  12. 12. Map Projections <ul><li>Distort the view of Earth’s surface. </li></ul><ul><li>Projection- a way of representing Earth’s curved surface on a flat map. </li></ul><ul><li>Cylindrical projection (Mercator) </li></ul><ul><li>Problem: They make areas farther away from the equator appear larger than they are. </li></ul>
  13. 13. <ul><li>Conic projections are based on the shape of a cone. </li></ul><ul><li>When the cone is flattened out, the latitude lines are curved slightly. </li></ul><ul><li>Most useful for mapping large areas in the middle latitudes, such as the U.S. </li></ul><ul><li>Problem: Distortion of landmasses near the equator and the poles. </li></ul>
  14. 14. <ul><li>Planar projections- Developed to help people find the shortest distance between two points. </li></ul><ul><li>Drawn as if a circle of paper were laid on a point on the Earth’s surface. </li></ul><ul><li>Sphere shape transferred to a flat map. </li></ul><ul><li>Good for plotting ocean or air voyages. </li></ul><ul><li>Problem: Landmasses farther away from the center point are greatly distorted. </li></ul>
  15. 15. THE END

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