Tuesday, September 4, 2012

MAP TYPES



CHOROPLETH MAP



A choropleth map uses a color scale to provide the onlooker an easy way to see how the variable being measured (in this case harvested acres of hay) varies within a particular region. This map utilizes a green color scale as its legend that shows all the counties’ hay production. Usually, the darker the color the higher the value, the lighter the color the lower the value. This map also has a detailed title.




DOT DENSITY MAP




This is a dot density map. A dot density map uses dots to illustrate the density of the variable being measured (in this case tobacco farms). This is a one-to-many dot density graph meaning that for every one dot there are fifteen tobacco farms. This map also makes good use of the North compass reading; clearly letting the onlooker know which direction they are looking.





PROPORTIAL SYMBOL MAP



Proportional Symbol Map uses the size of the symbol to represent the value. The bigger the symbol is the higher the value is going to be. To read these maps one looks at the size of the symbol in the map then compares it to the size of the symbol in the legend to figure out the quantity of measurement. This map measures the amount of forestry in each region of Europe. This map is easily and quickly read, and has all the requirements of a good map.




ISOPLETH MAP





Isopeth maps use contour lines depict a value because the value cannot be measured accurately at a certain point. They usually measure the elevation changes of land but these maps can also be used in meteorology to measure such tings like air pressure, rainfall, and temperature.





BATHYMETRIC MAP



Bathymetric maps measure the depth and change in elevation of bodies of water. It is a Topographic map but for water masses. Divers use these maps to anticipate changes in pressures due to changes in water depth. In the Bathymetric map above, it is easy for an onlooker to differentiate different depths because of the maps color scheme. Green would mean higher elevation and purple the lower elevation. This map is NOT complete with a legend, title, or north facing compass reading.




  
ENVIRONMENTAL SENSITIVITY INDEX MAP






Environmental sensitivity index maps map the environmental cultures of shorelines. They usually map more than just one element. They map things like animal’s habitats, shorelines, and public beaches or parks. These maps are made in case of oil spills. First responders can look at and environmental sensitivity index map and know where to go first. This map need a legend because of the complexity and uniqueness of it's symbols.


Here is a very eye opening video of the beginnings of hurricane Issac!











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