<P> A proportional symbol map is better than choropleth maps for showing raw data totals . A proportional symbols map uses symbols that are proportional the data that they are representing with point locations . These symbols can be true points or conceptual points . True points represent real objects or the exact location of a tangible object . This could be an oil well or fire hydrant . A conceptual point represents the center of the enumeration unit, such as a corn field . The raw data on proportional symbol maps go hand in hand with the data shown on choropleth maps . </P> <P> Isopleth maps use isolines that connect points of equal values . A good example of isolines is connecting areas with similar temperatures . As with choropleth maps, Isopleth maps require standardized data to be appropriately contoured . </P> <P> Dot maps use one single dot to represent where a single phenomenon is the most likely to occur . The total amount of dots can cover a single area or multiple areas . The density of the dots is interpreted by the user as areas of high value . This method is more accurate than proportional and Isopleth maps . </P>

What does a dot on a map mean