DRG

http://egsc.usgs.gov/isb/pubs/factsheets/fs08801.html

A DRG or Digital raster graphic, is developed by scanning a paper map onto a computer. These are useful for storing into archives for other to locate online. I know personally I use maps similar to this when I conduct land navigation. Everything from contour lines to roads and buildings are shown

DEM

http://www.satimagingcorp.com/gallery/dem-sahara-tunisia-lg.html

A DEM is a digitally constructed surface, giving life to hills, valleys, mountains and all the other features on earth. Created from terrain elevation data, we are able to construct 3-D images of the Sahara desert, which is shown above.

DOQQ

http://www.angling-technologies.com/index.php?page=all-48-states

 DOQQ images are pixel based. Each pixel is formed together and processed into creating a single larger picture such as what is shown above. The DOQQ imagery was consolidated and formulated into this aerial map view.

Continuously variable proportional circle map

http://geographyfieldwork.com/DataPresentationMappingTechniques.htm


 Continuously variable proportional circle maps show various amounts of variables and how they pertain to the proportionality of other areas. A bigger circle represents a bigger population, but within that circle multiple variables are being represented. Its basically data within data, as shown above.

Range graded proportional circle map

http://www.neiu.edu/~ejhowens/377/examples.htm

Range graded proportional circle maps show values of variables based on a region. The size of the circle is proportional to the data that is being represented. The map I have, for example, is showing the number of Mexicans located in each state. The larger the circle in the state, the more Mexicans are living there.

Classed choropleth maps

http://lib.westfield.ma.edu/censusaff.htm

 Classed choropleth maps allow us to class regions based on values and color. We can assign a range of numbers to a color then apply that to which ever State it fits for example. Above we can see median age being measured, the darker the shade of green the older the median age was in the year 2000.