Black and White Aerial Photo

Black and White aerial photo is a basic photo from above that is lacking color. Only black and white color is visible. 

 

http://www.math.toronto.edu/~drorbn/Gallery/KnottedObjects/Interchange/ 

Bivaiate Choropleth Map

A Bivaiate Choropleth Map shows two sets of data on one map by combining colors.

http://www.cartogrammar.com/blog/indiemapper-is-here/

Unclassed Choropleth Maps

Unclassed Choropleth Maps do not plot classes of data but simply a change in the shade of color to represent data.

 

http://www.esds.ac.uk/international/images/uchoropleth.gif 

Classed Choropleth Map

A classed choropleth map is a color coded map on which the data displayed by the colors is ranges or classes.
Increasing or decreasing the number of classes can dramatically alter the appearance of the data.

http://my.ilstu.edu/~jrcarter/Geo204/Choro/

This map displays 6 data classes for males/100 females.

Continuously Variable Proportional Circle Map

Continuously variable proportional circle map is a proportional circle map in which the size of circles are relative to the data collected.

 

http://pubs.usgs.gov/fs/fs-004-03/ 

This is map shows the relative width of the river.

DOQQ

Digital orthophoto quarter- quadrangles are photographic maps to a resolution such that each pixel represents 3 square feet on the ground.

http://www.sdc.ucsb.edu/adl/index.html

This is an example of black and white DOQQ. 

DEM

DEM (digital elevation model)  is a map showing elevations of land or sea floor. They are computer generated elevation or topographic maps.

http://www.dpi.vic.gov.au/dpi/vro/vrosite.nsf/pages/digital_elevation_models