The above map is an example of an isoline map because displays a map of a small portion of Nova Scotia in which the consideration of a new "mega" mall is being built and the costs and benefits are trying to be assessed. This map is important because it shows the trends in increased patronage as one gets closer to the actual mall and by placing lines around similar levels of anticipated shopping, it is much easier to see the biggest area of impact. This map is helpful because if the highest level of patronage had a circle that bulged on one side, then he cartographers could help the builders of the mall to perhaps move the location of the mall more to the center of the actual circle.
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