Map Projections and Map Scales

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Map Projections and Map Scales

  1. 1. Map Projections and Map Scales
  2. 2. Map Projections • The way of showing a round Earth on a flat piece of paper – All maps have distortion – The larger the map, the greater the distortion.
  3. 3. Three Types of Projections 1. Cylindrical – – – – Easy to use Latitude and longitude are at right angles Shows true direction Distorts high latitudes 2. Planar – – Useful for showing polar regions Distorts direction and distance 3. Conic – Good for showing a small area accurately
  4. 4. Map Scales • Shows the relationship of the distance on a map to the distance on the Earth. • There are Three types: – Graphic – Verbal – Representative Fraction • Shows the equivalent number of units on the map to units on the real Earth • The Representative Fraction shown above means that 1 unit on the map equals 100,000 units on the Earth (the units are inches unless specified otherwise)
  5. 5. Converting Representative Fraction Scales from inches to  feet to  miles • Scale  1:100,000 or 1/100,000 1. Inches  feet: Divide 100,000 inches by 12 (there are 12 inches in a foot) 2. Your Answer should be 8333 feet. 3. Feet  miles: Divide 8333 feet by 5,280 (there are 5,280 feet in one mile) 4. Your answer should be 1.58 miles. 5. So, this means that 1 inch on the map equals 1.58 miles on the ground. Now You Try: 1. 1:24,000 2. 1:56,700 3. 1:63,360
  6. 6. Answers to Problems 1. 1:24,000 – Inches  feet: 2000 feet – Feet  miles: 0.38 miles 2. 1:56,700 – Inches  feet: 4,725 feet – Feet  miles: 0.90 miles 3. 1:63,360 – Inches  feet: 5,280 feet – Feet  miles: 1 mile

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