GEOG 1280 Lecture Notes - Lecture 3: Gnomonic Projection, Equirectangular Projection, Mercator Projection
17 May 2017
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Document Summary
Represents the earth"s curved surface as a flat surface. Each map projection has its own limitation sand should be used only for the purpose for which its design is well suited. All maps have distortions: area, shape, distance, direction, scale o conformal true shape for small areas o equivalent equal area, no map can be conformal and equivalent at the same time. Cylindrical: mercator projection (scale distorts as you move north or south of the equator) Great circle routes: a plane cutting the earth in half through the centre. The shortest distance between two places on the earth"s surface. On a mercator projection, the great circle line is curved (rhumb line is straight: constant direction) The equirectangular projection preserves distances, so that distances along the equator remain the same. Galls-peters projects amplifies the size of equatorial locations. Thematic: various kinds of symbols are used to record the location of some phenomena.
