GG102 Chapter Notes - Chapter 2: Cartogram, Contour Line, Map Projection
Document Summary
A map simplifies reality so we can comprehend it better/faster/more thoroughly. But all of this comes at a price . Maps are repositories of trust and controlled fiction . Maps are two parts truth and one part lies : decisions to be made: Map scale how much do we want to show? area and detail (inverse relationship) Map type needs to suit the type of data. Ex: dot, choropleth, isoline, proportional symbol, cartogram which of the following do we want to show undistorted: Map projection area size? area shape? distance? (only an issue in the case of small scale maps: dot map raw values discrete (countable) phenomena exact locations, choropleth map derived values (e. g. , percentages) density. Colouring book" map: (not shown in class, isoline (or isopleth ) map lines connect points of equal value continuous phenomena weather maps, proportional symbol map symbol proportional to value of the phenomenon, solution: cartogram.
