A dot distribution map generally uses
dots or circles to represent an amount, value of a specific area. These maps
are scaled to reflect the amount of the data, which is represented within the
map. In addition, the individual dots are located on the map in accordance of
the data being mapped. While creating the map, the cartographer needs to take
into consideration the size of the area being mapped and the scale in relation
to the value of the various dots.
The map example “reflects the relative
abundance of this Karayevia suchlandtii
in the western EMAP study. Relative abundance is a measure of the proportion of
cells of this species based on a "fixed count" of 300 total diatom
cells counted and identified.” This information is per the EPA.
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