GG251 Lecture Notes - Lambert Conformal Conic Projection, Azimuthal Equidistant Projection, Mercator Projection
Document Summary
Distortion is least at the contact between the projection surface and the surface of the globe, and increases away from the point or line of contact. Three kinds of distortion: tearing, compression, and shearing. Azimuthal used commonly when projecting the poles, used often in canada"s north. Conical surface, projection is not full world view. Easy to recognize due to the grid pattern (azimuthal is plain and circular while conic captures a face") Tissot"s indicatrix, used for various types of maps, conformal (cylindrical mercator projection), equal-area (azimuthal), and equidistant (cylindrical plate carree) Classes of map projections based on geometric properties. Four important classes of map projections based on their geometric properties: conformal, equivalent/ equal area, equidistant, compromise. **compromise is the acceptance of distortion, as long as it is minimized! Conformal projections preserve the property of angular relationships, or local shape so that the outline of a small area is correct. Scale is true at the equator (least amount of distortion)
