Below you will find multiple maps along with descriptions
that explain what is being displayed and why the map is so useful. I have also
posted the link to a satellite animation video of Hurricane Isaac.
By definition, a Choropleth Map is a map in which certain
areas are shaded or patterned in proportion to the measurement of the
statistical variable that is shown on the map. The one pictured below shows the
estimated median household income in 2008. Choropleth Maps are useful because
they are able to easily display how the shaded or patterned areas compare to
each other.
The dots shown on Dot Density Maps each represent the
frequency of what is being measured. The map below provides us with information
about the housing and real estate value for Maryland in 2000. Dot Density Maps
allow us to see the rate of recurrence of the information that is being
quantified.
The size of the symbol on a Proportional Symbol Map corresponds
to the magnitude of what is being measured on the map. The following map shows
traffic fatalities in the U.S. by state in 2009. These types of maps are nice
because they make it easy to see the extent of what is being measured is
happening.
An Isopleth Map is a map that uses lines to connect points of
equal value. The one shown below depicts the total snowfall of a part of Texas
and the Lower Rio Grande Valley. The lines clearly show us which parts received
an inch of snow, three inches of snow, and four to six inches of snow.
An Environmental Sensitivity Index Map summarizes the
coastal resources that would be at risk in the event of an oil spill. Biological
resources, sensitive shorelines, and human-use resources are taken into
consideration when these types of maps are developed. I have posted a picture
of an Environmental Sensitivity Index Map below.
Here is the satellite animation video link of Hurricane
Isaac that I promised you. Enjoy!!
