GEOG 1HB3 Lecture Notes - Google Maps, Contour Line, International Date Line
3 Feb 2014
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Document Summary
Projection is a mathematical technique for representing a 3d sphere on a 2d map: put a paper on the surface of the earth, and shine a light bulb on it. The paper is wrapped around the globe: accuracy is greatest at the equator and declines as you move towards the north and south poles, conical projections are projected onto a cone touches the outside edges of the globe. Latitude and longitude is a system of imaginary arcs which are used to identify an absolute location for all areas of the earth. Latitudes (parallels) are a series of lines that run parallel to the equator. Equator = 0 degrees, north pole = 90 degrees n, south pole = 90 degrees s. Distances between lines are 1 hour, or 60 minutes between each parallel. Longitudes (meridians) are series of arcs which meet/converge at the north and south poles. Arcs are close together at poles, but are further away near the equator.
