GEOG 1000 Lecture Notes - Lecture 4: Rhumb Line, Aerial Photography, Satellite Imagery
1 Oct 2018
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Document Summary
Projections can be identified by the distortions which they avoid. Conformal projections - preserve shape by preserving correct angular relationships. Equidistant projections - preserve true scale (and thus distance). Azimuthal projection - preserves direction to places from a center point. May also be either equal area, conformal, or equidistant. Cylinders, cones, and planes are three developable surfaces. Cylindrical projection normally are tangent to the equator. Conic projections aka standard parallels are tangent to a parallel line. Planar projections - constructed by placing a plane tangent to the glove at a single point. Gnomonic projection - presents great circles as straight lines on the map but rhumb lines are curves. The prime virtue of the mercator projection is straight-line navigation. The lambert conformal conic projection with two standard parallels. Specialized projection like the interrupted homolosine projection are used to combine area and shape. Nominal (includes binary) - data belongs to categories; only has a identification property.
