1Geography 12: Maps and Spatial ReasoningLecture 3: Map Projection BasicsProfessor Keith ClarkeRecall: The scale transformationThe real world1:400MA representation of the worldA cartographic problemA possible solution?
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2That’s how “gores” are made!But…..•Not all of the world is on one section•Lots of cuts/breaks are necessary•The earth is still distorted•It is very cumbersome to use globes for measuring•All large cartographic scale maps would only curve a little bit•Cartography would be goringThe solution•Wikipedia says…A map projectionis any method used in cartographyto represent the two-dimensionalcurved surfaceof the earthor other body on a plane. The term "projection" here refers to any functiondefined on the earth's surface and with values on the plane, and not necessarily a geometricprojection. A projection!