GEOL 1014 Chapter Notes - Chapter 1: Phoenix, Arizona, Stillwater, Oklahoma, Google Earth

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13 Mar 2017
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Population Impacts
Exploring Population Density Data
1. Download from the class D2L website the four files under the Population Density Lab section.
Click on each to load them into Google Earth. After loading, make sure all of the checkboxes for
the four new files are turned off.
2. Use the navigation controls to view North America and zoom in so it almost fills your screen. In
the Layers menu, make sure Borders and Labels are turned on in the Primary Database.
3. In the Temporary Places sidebar, turn on the SEDAC_Pop_2000 (Population Density) data
layers. This is a data layer that displays population density in persons per square kilometer on a
global basis.
4. Adjust the transparency bar slider (at the base of the Places sidebar) so that you can see some of
the features of the land through the population colors.
5. Using the legend at right or the one in the map layer to answer the
following questions.
a. What is the approximate population density of Stillwater,
OK? Is this number about average?
b. Why do you think the east coast of the U.S. has a higher population density than
the west coast, in terms of geographical differences?
Explore the NO2 Concentrations for January
1. Deselect the Population Density layer. Then select (turn-on) the January 2010 NO2 data layer,
the one with the date of_2010_01_ in its title. This is a satellite data set showing NO2
concentrations in the global atmosphere. NO2 and other nitrogen oxides are air pollutants that
result from burning fossil fuels and use of agricultural fertilizer. It is a greenhouse gas, plus a
key ingredient in the formation of smog and acid rain.
a. Which region of the contiguous U.S. has the highest concentrations of NO2?
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2
2. Adjust the transparency bar for the January 2010 NO2 data layer so that you can see some of the
features of the land through the colors
3. To understand the seasonal effect, Leave the January 2010 NO2 data layer on and check
the May 2010 NO2 data layer (the one with the date of_2010_05_ in its title) to turn it on as well.
b. What differences do you observe in NO2 concentrations between May and
January in the eastern half of the country?
c. Hypothesize a possible cause for differences you observed?
Explore the Relationship Between Population Density and NO2 Concentration
1. Deselect all of the above layers, and then turn on the Population Density layer. Slide the
transparency bar all the way to the right to make that layer fully opaque (not transparent)
2. Keep the Population Density layer on and also turn on the January 2010 NO2 data layer. Use the
transparency slider and "flipping" technique to see how the two parameters are related
a. Based on your observations, describe the relationship between population density
and NO2 concentration?
Explore Population and Pollution in Phoenix, AZ
1. Under the Search panel on the left, type Phoenix, AZ into the "Fly to" field, then press return (or
enter) on your keyboard
2. Use the transparency bar to view the Population Density and January 2010 NO2 data layers.
You may want to start by zooming out so that the entire state of Arizona is visible.
a. Does the data comparison for the Phoenix region fit your previous observations
about population density and NO2 concentrations?
3. Zoom in to downtown Phoenix. Adjust the zoom to get an Eye Alt (altitude) of around 1.5 to 2
km (1 mile). Read the "Eye Alt" value shown in the extreme lower right of the Google Earth
window.
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