GEOG 2480 Lecture Notes - Lecture 11: Great Circle, Spatial Analysis, Trigonometric Functions
1 Feb 2017
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Document Summary
Map projection process: reference globe (to generate scale, developable surfaces; plane, cylinder, or cone, four families of map projections; azimuthal (planar), cylindrical, conic, Mathematical: projection properties; conformal (shapes), area, distance, direction, projection parameters (fine tuning for study area) Based on mathematics not physical light source" projections. Some don"t relate to geometric projections a t a l l. ^ no scale distortion at tangent point/ line (where map surface contacts reference globe) *often a parallel or meridian. Secant line = the tangent line where the map contacts the reference globe. Forms a curve on the reference globe. Projection distortion between secant lines makes features smaller. Projection distortion outside secant lines makes features larger. Conic/ cylindrical projections have 2 secant lines. Aspect = position of projected graticule relative to ordinary geographic grid on earth. Central meridian = meridian on earth that defines centre of the projection. Major properties: equal area" aka equivalent projections.
