Generally speaking, GIS is not well suited to the analysis of phenomena that move. Analytical operations in GIS tend to focus on vertical relationships between layers. Further, it is sometimes very difficult to detect spatial movements. Figures 1 and 2, for example, illustrate areas of Gypsy Moth defoliation in 1982 and 1983 respectively. This insect was accidentally released in the late 1860's by an amateur entomologist, and has since spread over much of northeastern North America. However, it is hard to detect any spread with this much variability on a year-to-year basis. It is possible to describe such phenomena though with the TREND module (possibly with the assistance of the MDCHOICE module).
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GIS Weekly Magazine
Susan Smith
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Look for the next issue of GIS Weekly Magazine on May 28, 2012.
Each GISWeekly Review delivers to its readers news concerning the latest developments in the GIS industry, along with a selection of other articles that we feel you might find interesting. |
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