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Figure 6.15 Oklahoma population change over time. Source of base map: Esri software.
state in 1930? While Oklahoma and Tulsa counties are prominent, the site
of Oklahoma City and Tulsa, the largest urban centers in Oklahoma, many
rural counties have fairly high population as well, right before the Dust Bowl
caused a mass exodus. What is the total range of the data? The data ranges
from 5408 to 221,738.
Change the method of thematic mapping to equal interval and note the
pattern. Repeat the process for standard deviation, and then for quantile.
Which classification method gives you the best understanding of the total
population and the spatial distribution of the population for 1930? You are
the data producer and the data consumer, and you have the power to make
the decisions, but keep in mind the tenets introduced in this topic, and in
particular, the understanding your map imparts to the end user. Next, make
a natural breaks map for 1940, and then for 1970, and then for 2010. How
does the spatial pattern change over time? What patterns are persistent over
time? Oklahoma City and Tulsa increase in population while rural areas
decline, resulting in a less dispersed and more nodal structure. The rural
counties that do increase in population consistently are suburbanizing coun-
ties near the population centers. What do you predict Oklahoma's popula-
tion totals and patterns will be in 2050? The trends since 1940 are likely to
continue; that is, rural population loss and continued urbanization. Note
the numbers at the low and high end of the ranges for each of the above
years 1930, 1940, 1970, and 2010. What does the fact that the population of
the least populous county in the state decreases, rather than increases, tell
 
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