Isotachs

http://jasonahsenmacher.wordpress.com/

Isotachs are lines showing areas of equal wind speed. the map above is showing wind speeds across the united states.

Isobars

http://www.mv.k12.wa.us/science/integrated/athena/curric/weather/hsweathr/isobar.html

Isobars are used to show areas of equal pressure. This is useful in meteorology for predicting storm paths and different seasonal fronts.

Index Value Plot

http://www.bogleheads.org/forum/viewtopic.php?f=10&t=89998

An index plot works like a line graph, except the values represented are indexed. Stock market graphs often show indexed values to compare their growths to previous rates, but still factor in a change in currency inflation.

DLG-Digital Line Graph

http://www.mapcruzin.com/free-geodata-shapefiles/usgs-geospatial-data-geodata-geographic-download.htm

Digital line graphs are a tool to show topographical information, and uses vectors to present data. DLG images are less memory intensive than digitizing an aerial image, and is equally, if not more effective, at drawing attention to geographic features.

DOQQ

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

DOQQ, or digital orthoquarter quad, is an image that has been georectified to show the accurate placement of land features. The image above is a flood insurance rate DOQQ

Unclassed Choropleth Maps

http://www.esds.ac.uk/international/support/user_guides/gisoverview.asp

Unclassed choropleth maps are like other choropleth maps, using shades of color to represent data correlation. Instead of having variable ranges split into groups, like a classed choropleth map, there are as many intervals as there are areal spaces.

Continuously Variable Proportional Circle Map

http://geographyfieldwork.com/DataPresentationMappingTechniques.htm

Continuously variable proportional circle maps are useful in the same way regular proportional circle maps are, except that the former can present several different variables. Notice the example map above, the size of the circle indicates a high concentration of all variables, but sizes of the particular sections of each circle also indicate the concentration of the individual variables.