Map Projections - Spatial Mathematics: Theory and Practice through Mapping - page 204

a single word). In the search results window, click on the thumbnail image to
open the group. Scroll down and open the map “Goode Homolosine Land”
in the ArcGIS.com map viewer. The Goode homolosine projection is a pseu-
docylindrical, equal-area, composite map projection used for world maps. Its
equal-area property makes it useful for presenting the spatial distribution of
phenomena. It is typically presented with multiple interruptions, as is shown
in this map, with the “interruptions” being the oceans. Click on “Add to this
Map.” In the “Find” slot, search for data “Global Natural Hazards Data,” and
in the results window, Add the Global Natural Hazards Data by NOAA_NGDC
(marine geological samples). Select “Done Adding Layers.” Expand the layer
and make the data visible as “Significant Earthquakes.” Click on the map leg-
end button to view the legend. The western hemisphere of a map generated
using this process appears in Figure 9.9 (please be aware that web-based
mapping may change; interpret the specific directions as needed in order to
generate a map similar to this one).
Describe the pattern of significant earthquakes around the world. Look par-
ticularly at coastal areas. Do you find regions that have had larger earth-
quakes that are a surprise to you? Consider the large orange circle in the
interior of the USA, away from the coast (Figure 9.9). That situation may
surprise a number of North American residents. It illustrates, however, the
Figure 9.9 Significant earthquake data displayed on a Goode's Homolosine projec-
tion (cropped to show the Western Hemisphere). Source: Esri base map.