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Map Projections

"The Impossible Map"
    One of the most complex and confusing aspects of GIS is exactly how to go about representing the globe on a map.  The Earth which is a sphere, or more precisely spheroid, is three-dimensional in nature and therefore, doesn't lend itself well to being depicted on a two-dimensional surface.  Over the course of time, many different approaches have been developed to try and accuratly translate shapes, areas, distances, and directions from the Earth onto a flat map.  Although no map projection can preserve all four of these properties at once, certain ones have been developed to preserve one or two at the same time.  Check out the following 10-minute educational video produced by the National Film Board of Canada (NFB).  The film, directed by Evelyn Lambart back in 1947, uses grapefruit peels to illustrate the problems associated with mapping the globe on a flat map.

Watch "The Impossible Map" - Evelyn Lambart (1947) in Animation | View More Free Videos Online at Veoh.com
Check back later for more information about map projections!