Abstract
The accuracy of an isopleth map depends upon the soundness of the procedure by which the map is constructed. The steps presented here include preparation of a dot map on which a circular area of constant size, drawn on a transparent medium, is centered over each control point and the dots within it are counted in order to assign a value to that point. Such a procedure insures that control areas are consistent in size and it allows the mapmaker to choose the arrangement and number of control points. It also results in a total volume that accurately reflects the total number of objects. The size of the circular control area will affect the smoothness of the resulting isopleth map.
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