April 2013
Beginner to intermediate
672 pages
21h 44m
English
book
Introducing Geographic Information Systems with ArcGIS: A Workbook Approach to Learning GIS, 3rd Edition
by Michael D. Kennedy
Content preview from Introducing Geographic Information Systems with ArcGIS: A Workbook Approach to Learning GIS, 3rd Edition
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Don’t Hesitate to Sort Information
For example, suppose some 348 “areas of critical environmental concern” have been nominated and an identification code attached to each; your GIS has the information to calculate a factor between 1 and 100 that suggests the degree of danger to which each is subject. The output you envision is a list, in order of identification code, with the “danger factor” printed out in an adjacent column. As you begin to use the output, you discover yourself looking through the list to find the area with the highest factor, then the next highest, and so on. At this point, while all that you want is there, it clearly could be in a better form: in order of the danger factor rather than (or in addition to) the identification code order.
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