Infrared Aerial photograph-San Diego, CA

This is an infrared aerial image of San Diego, California.  It's imagery is the same as a regular aerial photo, but all the color on the map is falsified.  Generally it is returned back as red, and is a useful way to distinguish urban areas from natural areas.  Aerial photography is useful in tracking storm systems and hurricanes as well.http://californiamapsociety.org/mapping/remote.php

Aerial photograph- Downtown Chicago

The image above is an aerial photo of downtown Chicago.  The city is visible, along with the shoreline of Lake Michigan.  Aerial photography reveals a great deal about the geography of an area, along with a detailed picture of the various landforms and vegetation.  In this case, there is no vegetation and the city expands in all directions.http://commons.wikimedia.org/wiki/File:Chicago_Downtown_Aerial_View.jpg

Isotach

An Isotach map is one that displays lines of equal wind speed.  This isotach shows the wind speeds in the Southeast U.S. and the Gulf of Mexico. AN isotach also displays the direction from which the wind is moving.  This image shows converging winds in the center because an area of low pressure is forming.   http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1456&tstamp=&page=5

Isohyets-Hurricane Camille

The map above is know as an isohyet map.  Isohyets are lines of equal precipitation.  The image above portrays isohyets from Hurricane Camille in Virginia.  Generally, the heavier lines of precipitation are in the center of a isohyet image, and as you go outward, precipitation decreases.  The above image measures precipitation in inches, and some areas received up to 25 inches of precipitation.http://pubs.usgs.gov/of/1999/ofr-99-0518/ofr-99-0518.html

DRG- Denver, CO

DRG stands for digital raster graphic.  A DRG map like the one displayed above is a scan from the USGS series of topographic maps.  The scan displays all the cartographic information, as well as spatial data.  This is a DRG map of Denver, CO in 1899.  The newer USGS maps are much more detailed and most likely more accurate.http://www.ghostdepot.com/rg/maps/drg%20map%201899%20red.jpg

DLG

The map above is an example of a DLG (digital line graph) map.  A DLG is a  digital visualization of  geographic areas.  For example, this is a map of roadways and rivers surrounding a ranch.  Based on this visual aid, a traveller can get an idea of what the land looks like.http://dlgranch.com/location.html

Range graded proportional circles map

A range graded proportional circles map shows a display of data through a distribution of circles or red dots.  The map above shows the Hispanic population throughout the United States.  Each dot equals a population of 100,000 hispanics.https://www.e-education.psu.edu/natureofgeoinfo/book/export/html/1553