standardized choropleth

http://www.infovis-wiki.net/index.php?title=Teaching:TUW_-_UE_InfoVis_WS_2007/08_-_Gruppe_06_-_Aufgabe_1_-_Thematic_Map

This standardized choropleth map shows one variable.  It shows the distribution of the worlds population per square kilometer.

continuously variable proportional circle map

http://tsun.sscc.ru/tgi_9.htm

This is a continuously variable proportional circle map.  The map is of the known craters on the Earths surface. The size of the circles are proportional to the actual size of the craters.

correlation matrix

http://www.psychstat.missouristate.edu/multibook/mlt07m.html

A correlation matrix is a type of graph that allows you to compare two different things in a number of categories.  

univariate choropleth map

http://www.personal.psu.edu/jhk169/geog586/lesson8/

A Univariate choropleth map is a choropleth map that only shows one variable.  In this map it shows the percent of Pacific islanders living in Auckland, New Zealand.

bivariate choropleth

http://proceedings.esri.com/library/userconf/proc99/proceed/papers/pap171/p171.htm

A bivariate choropleth map is a variation of a normal choropleth map.  It shows two different variables.  In this map it shows the population and the median home value.  It is interesting to see the home values in the more or less populated areas.  

DOQQ

http://www.crwr.utexas.edu/gis/gishydro00/Class/trmproj/Donnelly/termproject.htm

A DOQQ map is  an aerial picture that is geometrically correct.  The scale is correct and you can use the  map to measure distance.  in this map the scale is correct and would be a good map to use to see how far something's true distance is.

dem map

http://tahoe.usgs.gov/DEM.html

A DEM map is a map that shows a 3-D representation of the Earth's surface.  This is a DEM map of Lake Tahoe from the USGS.  You can see where the lake is in the the center and see the much taller mountains surrounding it.