Map #51: Continuously variable proportional circle map

http://www.lib.utexas.edu/maps/germany.html


These maps plot information with circles rather than dots, which are plotted in size, according to the amount of each given variable. There are many different size circles used, rather than a set size used. This map shows the most common industries used in West Germany, as well as how prominent they are, according to circle size.

Map #50: DLG Map

http://pubs.usgs.gov/of/2003/of03-471/domier/index.html

DLG stands for digital line graphs, which is a type of graph that is georectified. This DLG shows different variations according to lines being closer or further apart. It shows a park, gravel, roads, tanks, a sewer dispenser, and hills. These are helpful in displaying the different types of things in an area to see what else can be placed in the particular area.

Map #49: DRG Map

http://lter.kbs.msu.edu/maps/gis_data.php

This is a digital raster graphic. These types of digital maps are scanned to a datum and provide the coordinates when you click on an area. It is also georectified, meaning it is corrected by a database it is scanned into, making the map highly accurate.

Map #48: Doppler Radar Map

http://www.atmos.washington.edu/~cliff/coastalradar.html

This is a doppler radar of hurricane Katrina in New Orleans, 2005. Doppler radar detect either microwave or radio radiation, through a sensor that uses ranging. It is used for weather in detecting clouds, hurricanes, and atmospheric conditions.

Map #47: DOQQ Map

http://www.geomart.com/products/geodata/digital.htm

The Digital OrthoQuarter Quad is a georectified map showing an aerial view of the area. Depending on the film used when taking the DOQQ in the airplane, the color of the picture may be false.

Map #46: DEM

http://www.emporia.edu/earthsci/student/alvarez1/551proj.html

This is a DEM, or digital elevation model, showing Sacramento, California's valley elevation. The dark blue represents lower elevation and the elevation increases as the colors on the scale move towards red and then white. This type of map is also georectified.

Map #45: LIDAR

http://coralreefs.wr.usgs.gov/mapping_lidar.html

This LIDAR, or light detection and ranging maps are a type of active remote sensing, which produces its own electromagnetic radiation. It uses lasers instead of radio or microwave radiation. This particular map shows the coral reefs in South Moloka‘i in order to keep track of growth and see how hurricanes have been effecting them. It shows a large hole in the reef.