Proportional Symbol Maps
Using Absolute Scaling Using Perceptual Scaling Summary Absolute scaling for proportional symbol maps allows for an accurate representation of the area difference between cities. However, when viewed on a map, humans commonly underestimate area differences for symbols when using absolute scaling. In the map of Indian cities with a population greater than 2 million, the absolute scaling, although scaled to true values, makes it look like the middle-sized cities are a lot closer in population size to the largest cities such as Delhi, Mumbai, and Kolkata. This problem is largely…read more