Map is one that preserves true scale for all straight lines passing throughĪ single, specified point. No map has true scale everywhere, but most maps have at least Same distance (accounting for scale) that it is on the earth, then the map line No map can preserveīoth shape and area for the whole world, although some come close over sizeable It another way, a coin moved to different spots on the map represents the sameĪmount of actual ground no matter where you put it.Įqual-area map, the shapes of most features are distorted. Space that actual Norway takes up on the earth. World map, Norway takes up the same percentage of map If a map preserves area, then the size of a feature onĪ map is the same relative to its size on the earth. On the 20th parallel are equally distorted, features on the 40th parallel areĮqually distorted (but differently from those on the 20th parallel), and so on. May be constant along any given parallel. Of distortion, however, is regular along some lines in the map.
Map distorts area-most features are depicted too large or too small. Even on a conformal map, shapes are aīit distorted for very large areas, like continents. If a map preserves shape, then feature outlines (likeĬountry boundaries) look the same on the map as they do on the earth. Spatial properties subject to distortion in a projection are: In particular, compromise projections try to balance shape and Some maps are compromises-they get nothing exactly right but nothing too far Scrunched up or set too far apart, but their relative positions will be Your features may look weird, and they may be Measurements from the tip of your nose to your chin, ears,Īnd eyes will be right, even though the size and shape of your features is wrong. Mouth will appear wide, thin, and rather mean. Get the sizes right, but the shapes will be stretched-maybe your full, round Sizes-your forehead and chin, for instance, may come out huge. Maps will get the shapes of all your features just right, but not the
Map projection as an attempt to reconstruct your face in two dimensions. Investigate in more detail in Module 4, Understanding and Controlling Single fact about map projections-they distort the world-a fact that you will A sphere to a flat surface results in distortion.
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