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| Choropleth Map |
This choropleth map denotes the amount of
freshwater used in each of the fifty states and Puerto Rico. The various colors
represent differences across the states. Based on the legend, you can see that
GA uses between 500-1,000 (in million gallons per day) gallons per day. This
map is useful because it illustrates particular themes and simplifies
quantitative data in population analysis.
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http://water.usgs.gov/watuse/wumaps.color.html
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| Dot Density Map |
The map to
the left is a dot density map and I believe this is an excellent map to
illustrate the prevalence of a well-known public health concern, AIDS. Each dot
represents 50 individual cases and the map denotes major states such as
Atlanta, New York, Los Angeles, Texas and Florida to possess a substantial
amount of cases.
http://www.docstoc.com/docs/74871769/AIDS-Dot-Maps-_through-2007_
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| Proportional Symbol Map |
The map to the right denotes fishing participation among Americans. The
different sizes represent the amount of fishing in the illustrated geographic
areas. I think this is a good map for surveillance with respect to monitoring
areas in which are known for fishing and could potentially pose a threat if
there were to be some type of waterborne contaminants associated with aquatic
life in the US.
*each square represents a value ranging from 100,000-2,800,000 in multiples of 675,000 participants.
http://personal.frostburg.edu/jfrech0/jon_maps.htm
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| Topographic Map |
The topographic map to the left is of a 3D Australian mountain satellite image. Topographic maps describe the shape of the land and are usually depicted by the use contour lines that illustrate the highest and lowest points of a geographic area. In this case, you can see the height of different features of the landscape, because the image is in 3D. This map did not have a legend, but I'm assuming that the colors are representative of the various elevations. This may be useful to evaluate the steepness of slopes of a surface and in my opinion, would help an architect map out and design plan for construction or mining.
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| Environmental Sensitivity Index Map |
The last map to the right contains vector polygons which represent the Connecticut Coastal shoreline in the year of 2002. This map is of vital importance for public health prevention and strategies in the event of a catastrophe such as an oil spill. Environmental sensitivity index maps depict information about shoreline type (sensitivity, ease of cleanup), biological (at risk organisms) and human-use resources (beaches, airports).
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