Map Projections and Coordinate Systems (Cartographic Fundamentals) Flashcards Preview

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Flashcards in Map Projections and Coordinate Systems (Cartographic Fundamentals) Deck (15)
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1

Map Projection

a system in which locations on the curved surface of the Earth are displayed (projected) on a flat sheet or surface according to some set of rules.

2

Geoids, ellipsoids, spheres, and globes

NOT developable surfaces because you cannot flatten them

3

Tangent case

One standard line or point of contact

4

Secant case

Two standard parallel lines or points of contact

5

Projection: Plane

Azimuthal projections(Equatorial, Polar, Oblique)

6

Projection: Cylinder

Cylindrical(rectangular) projections (Scale distortion increase as you move away from the standard lines)

7

Projection: Cone

Conic Projections (doesnt show entire world)

8

Developable surface

Can be flattened

9

Tearing

All projections suffer from tearing, which occurs when a map shows an edge on the surface of the Earth

10

Shearing

Shearing occurs when a projection bends or warps features on the Earths surface without changeing their area

11

Compression and Exaggeration

Occur when a projection changes the area of objects on the surface of earth

12

Equivalent(Equal area)

preserves area

13

Conformal (orthomorpic)

Preserves angles(shapes)

14

Equidistant

Preserves great circles distance

15

Standard Lines

SF= 1 >no distortion
SF>1 =exaggeration
SF<1 =compression