Map Projections


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Map Projections

  1. 1. Key A C D E F G <ul><li>Which Town do you think has fishing as the basis for their economy? </li></ul><ul><li>What is the most Southerly Physical Feature? </li></ul><ul><li>What is a main reason that the Wheat Field is located where it is? </li></ul><ul><li>What is the Human Characteristic located furthest North? </li></ul><ul><li>What town do you think provides a lot of material to the government to make pennies? </li></ul><ul><li>What town is the furthest to the south, but still connected to the railroad network? </li></ul>H = Copper = Wheat Field = Railroad = Lake = River = Forest = Statue of Mr. Raponi = Golden Gate Bridge B N S E W
  2. 2. Map Projections Created by Mr. Raponi
  3. 3. Map Projection <ul><li>A map projection is any method used in </li></ul><ul><li>___________________ (mapmaking) to represent the curved surface of the earth on a flat surface. </li></ul><ul><li>This cannot be done without some </li></ul><ul><li>____________________. </li></ul><ul><li>The mapmaker must select the one best suited to the needs, reducing distortion of the most important features. </li></ul>Cartography Distortion
  4. 4. Distortions
  5. 5. Mapmakers <ul><li>Mapmakers and mathematicians have devised almost </li></ul><ul><li>________________ ways to project the image of the globe onto paper. </li></ul><ul><li>Every projection has its own set of advantages and disadvantages. There </li></ul><ul><li>is no “______________&quot; map projection . </li></ul>Limitless Perfect
  6. 6. Good Uses of Flat Maps <ul><li>Flat maps can be more useful than globes in many situations: </li></ul><ul><li>Maps are more compact and easier to store. </li></ul><ul><li>They are viewed easily on computer displays. </li></ul><ul><li>Maps can show larger portions of the earth's surface at once. </li></ul><ul><li>These useful traits of flat maps motivate the development of map projections. </li></ul>
  7. 7. The Problem with Flat Maps <ul><li>Every flat map misrepresents the surface of the Earth in some way. </li></ul><ul><li>No map can rival a </li></ul><ul><li>_______________in truly representing the surface of the entire Earth </li></ul><ul><li>Since the world is a sphere, and a globe is a sphere, a perfect representation can be made. </li></ul>Globe
  8. 8. Mercator Projection <ul><li>This map makes areas </li></ul><ul><li>near the ____________ look bigger than they really are. </li></ul><ul><ul><li>Example, Greenland looks bigger than it really is. Here, it is larger than S. America, but in real life, it is less than half the size. </li></ul></ul><ul><li>This is because, on a globe, the lines of longitude meet at the poles, but on this type, </li></ul><ul><li>they are _____________. </li></ul>Poles Parallels
  9. 9. Compare the Two
  10. 10. Interrupted Projection <ul><li>By creating </li></ul><ul><li>_____________ in the picture of the world, mapmakers showed the size and shape of most of the land quite accurately. </li></ul><ul><li>Problems: </li></ul><ul><ul><li>The gaps make it impossible to figure distances correctly </li></ul></ul><ul><ul><li>You could not use this kind of map to chart a journey across the ocean. </li></ul></ul>Gaps
  11. 11. Peter’s Projection <ul><li>The Peters Projection was created in </li></ul><ul><li>______________ by Dr. Arno Peters to address some of the distortions of existing maps </li></ul><ul><li>Problem: One square inch anywhere on this map represents an equal number of square miles. Distorts the shape in some cases. </li></ul><ul><ul><li>Example: Africa </li></ul></ul>1974
  12. 12. Robinson Projection <ul><li>Presented by Dr. Arthur H. Robinson in </li></ul><ul><li>___________________. </li></ul><ul><li>Today, many geographers believe this to be the best world map available. It has been called so by National Geographic </li></ul><ul><li>While the Robinson projection does distort the globe a little, (Check out Antarctica), it shows the sizes and shapes of most countries accurately. </li></ul>1963
  13. 13. Conclusion <ul><li>There are many other types of projections, each with positives and negatives about them. </li></ul><ul><li>The key is knowing for what purpose you wish to use the map. </li></ul><ul><li>You will then be able to pick the map that best suits your needs. </li></ul>
  14. 14. Map Projections