Geography 2122A/B Chapter Notes -Developable Surface, Map Projection
Document Summary
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: