Choropleth map
Choropleth map - a map that uses graded differences in shading
or color or the placing of symbols inside defined areas on the map in order to
indicate the average values of some property or quantity in those areas
Dot Density Map
A dot density map is a thematic map that carries information
by showing a large number of tiny dots, wherein each dot represents some
specific unit quantity.
Proportional Symbol Map
personal.frostburg.edu
A proportional symbol map is a type of thematic map in which
the areas of symbols are varied in proportion to the value of an attribute.
Isopleth Map
ksn.com
An isopleth map is a map
which uses lines joining points of an equal value to show variations in that
value e.g. contour lines on a topographical map, isobars on a weather map.
Here is a hyperlink to a brief hurricane video:
