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Cartographers   affect how we perceive  our  world
Representing the earth A geographical map is a two-dimensional, geometrically accurate representation of a three-dimensional  space. Inevitably,  however,  distortion is  introduced when  a globe is made  to lay  flat. This teacher uses a physical map of Europe to explain his point.
Ancient  map Claudius  Ptolemy   (150 AD)   map  drawn from Ptolemy's coordinates for a 1482 edition of his  Geographia
Types of map projections ,[object Object],[object Object],[object Object],[object Object],[object Object],Each introduces some error inherent when three-dimensional sphere is flattened into two dimensions.
The earth is round. The challenge of any world map is to represent a round earth on a flat surface.   Which projection?
Map Projections
Cylindrical Projection:  is based on a cylinder tangent to the equator. Good for  equatorial regions  but greatly distorted at  high latitudes .
Though the  Mercator projection  is particularly good for navigation, it becomes increasingly distorted toward the poles, resulting in areas appearing much larger than they actually are. Mercator projection
 
The  distortion  caused by a Mercator projection  makes Greenland appear larger than Australia when, in fact, it’s one-third its size.
The  Eckert projection  tries to keep the  countries in relative proportion but still  flattens out near the poles.
The  Peters projection  is an area-accurate map
The Robinson projection The  Robinson projection  is based on tables   of coordinates. The projection distorts shape, area, scale, and distance in an attempt to balance the errors of projection properties.
 
Polar This projection is used by pilots to determine the shortest route between two points on the globe.
Upside down?   Depends on our pre-conceptions
Differences between map projections
 
Map Symbols Legend Compass Rose These keys should be included on any map to which they apply Strait Isthmus Scale
Landsat ,[object Object]
Global Positioning Systems (GPS) ,[object Object]
“ Like a huge piece of orange peel that refuses to be flattened without tearing at the edges, the globe cannot be forced into two dimensions without distortion. But that distortion can now be minimised  “ Atlas technology
Geographic Information Systems (GIS) ,[object Object]
Links ,[object Object],[object Object]
Links

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Maps Ppt

  • 1. Cartographers affect how we perceive our world
  • 2. Representing the earth A geographical map is a two-dimensional, geometrically accurate representation of a three-dimensional space. Inevitably, however, distortion is introduced when a globe is made to lay flat. This teacher uses a physical map of Europe to explain his point.
  • 3. Ancient map Claudius Ptolemy (150 AD) map drawn from Ptolemy's coordinates for a 1482 edition of his Geographia
  • 4.
  • 5. The earth is round. The challenge of any world map is to represent a round earth on a flat surface. Which projection?
  • 7. Cylindrical Projection: is based on a cylinder tangent to the equator. Good for equatorial regions but greatly distorted at high latitudes .
  • 8. Though the Mercator projection is particularly good for navigation, it becomes increasingly distorted toward the poles, resulting in areas appearing much larger than they actually are. Mercator projection
  • 9.  
  • 10. The distortion caused by a Mercator projection makes Greenland appear larger than Australia when, in fact, it’s one-third its size.
  • 11. The Eckert projection tries to keep the countries in relative proportion but still flattens out near the poles.
  • 12. The Peters projection is an area-accurate map
  • 13. The Robinson projection The Robinson projection is based on tables of coordinates. The projection distorts shape, area, scale, and distance in an attempt to balance the errors of projection properties.
  • 14.  
  • 15. Polar This projection is used by pilots to determine the shortest route between two points on the globe.
  • 16. Upside down? Depends on our pre-conceptions
  • 17. Differences between map projections
  • 18.  
  • 19. Map Symbols Legend Compass Rose These keys should be included on any map to which they apply Strait Isthmus Scale
  • 20.
  • 21.
  • 22. “ Like a huge piece of orange peel that refuses to be flattened without tearing at the edges, the globe cannot be forced into two dimensions without distortion. But that distortion can now be minimised “ Atlas technology
  • 23.
  • 24.
  • 25. Links