A hypsometric map displays information about elevations through contour lines, or as in this example, through shading, color tinting, and occasionally, batching.
Planimetric maps are digital, graphical maps that portray horizontal information using points, lines, and polygons. They are associated with an X,Y coordinate system and are most often used in urban planning and development.
Dot Distribution maps represent populations of a variable according to densities. In this example, the cartographer chose to use red dots to exemplify Feeder Watchers homes in North America. Most Feeder Watchers live in the northeast United States.
Proportional Circle Maps are popular because circle scaling is less difficult than with other symbol forms and they are more visually stable, and so they result in images that cause little eye irritation to map readers.