Geography 2240A/B Study Guide - Map Projection, Developable Surface

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15 Jul 2014
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A map projection is a geometrical transformation of the earth"s spherical or ellipsoidal surface onto a flat map surface. Scale: the stated scale is true only at selected points or along particular lines. There are two map scales: principal scale: the scale of generating globe (no variation, actual scale: the scale we measure at any point on the map. Scale variations here is the result of geometric distortion: sf = actual scale / principal scale. Projectin families based on map projection surface: projection surface, developble surface: the flat surface that the earths features are projected onto, three projections families based on the developable surface:

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