Geoscience Reference
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power of using a map as a guide to asking research questions. Maps can
serve as far more than mere displays to support text. When used well, they
can also guide research.
Consider the global pattern of earthquake data when displayed on a Goode's
homolosine (Figure 9.10a). Note that there are numerous events around the
margin of the Pacific Ocean. Yet, because the projection is interrupted in the
oceans, any unified pattern surrounding that ocean is difficult to visualize.
Go back and open the map “coordsys_EckertIV_150E,” the Eckert IV projec-
tion (scroll down or go to extra pages as needed). The Eckert IV projection is
a pseudocylindrical map projection, in which the length of Prime Meridian is
half that of the Equator, and the lines of longitude are semiellipses, or por-
tions of ellipses. As you observe this map, consider the significance of the
“150 E” in the title of this map file. Since this map is centered on a meridian
Figure 9.10 (a) Global view of earthquake data displayed on a Goode Homolosine
projection. (b) Global view of earthquake data displayed on an Eckert IV projection
(centered on 150E). Source of base map: Esri software.
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