GGR272H1 Lecture Notes - Lecture 7: Visual Perception, Cartogram, Digital Elevation Model
Document Summary
June 1: lecture 7 - quantitative map types. Dot maps - visually show density of something across an area. Choropleth maps - show quantities over areas (quantity normalized - assign to classes and colours to classes -gradient) Dot maps - more visual (e. g. population - imagine people clustered together: doesn"t require normalization - normalization is done visually. With software there is less control than making a dot density map manually. Dot map for one polygon - software will randomly place dots within the polygon (it takes the total count - how many 1000s in population, these dots are randomly placed) Need to choose don size and dot value. Show magnitude using sizes of shapes - good for point data. Proportional symbol map (size of symbol determined by e. g. size of population) In legend - not classes, but examples to provide scale. Graduated symbols: data values have been put into classes - scales symbol size for that class.
