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Questions and Answers
What is a map projection?
What is a map projection?
- A method for measuring distance on a globe
- A method for mapping spatial patterns on a curved surface to a flat surface (correct)
- A type of globe
- A three-dimensional model of the earth
What is the best model of the earth?
What is the best model of the earth?
a globe
What are some drawbacks of using a globe?
What are some drawbacks of using a globe?
- Not easy to carry (correct)
- Not good for making planimetric measurements (correct)
- Scaleable
- Good for measurement
Maps are difficult to carry.
Maps are difficult to carry.
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The earth is a _____
The earth is a _____
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What are the three developable surfaces mentioned?
What are the three developable surfaces mentioned?
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Study Notes
Projections
- The Earth is modeled as a spheroid, with a globe being the best representation.
- Globes have drawbacks: not portable, and unsuitable for planimetric measurement (distance, area, angle).
- Maps, by contrast, are flat, making them portable, measurable, and scalable.
Map Projections
- A map projection translates spatial patterns from the Earth's curved surface to a flat surface.
- This involves projecting an imaginary light onto a "developable surface," creating a flat representation of geographic data.
- Several projection models exist, adapting to different uses and areas.
Developable Surfaces
- Cone:
- Can be a secant cone (intersects the sphere) or a tangent cone (touches the sphere at one point).
- Plane:
- Represents a flat surface for projection.
- Cylinder:
- Involves tangent cylinders, where the cylinder touches the Earth at a single line, leading to distortions in area and shape.
Coordinate Systems and Datums
- While specific details on coordinate systems and datums were not provided, they are essential components for determining the geographic position on a map.
- Coordinate systems give the framework for identifying locations, while datums serve as reference points for measuring positions on the Earth’s surface.
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