Exploring Geographic Information Systems

Front Cover
Wiley, Jan 6, 1997 - Science - 320 pages
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Geographic Information Systems (GIS) is the organized activity by which people:
  • measure aspects of geographic phenomena and processes;
  • represent these measurements, usually in the form of a computer database, to emphasize spatial themes, entities, and relationships;
  • operate upon these representations to produce more measurements, and to discover new relationships by integrating disparate sources; and,
  • transform these representations to conform to other frameworks of entities and relationships.
These activities reflect the larger context, such as institutions and cultures, in which these people carry out their work. In turn, the GIS may influence these structures. This text provides the comprehensive coverage you will need to master this powerful new technology.

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Contents

RUILDING RLOCKS OF GEOGRAPHIC INFORMATION
1
The Conventional View
8
Reference Systems
17
Measurement Frameworks
23
Isolated Objects to Connected Coverages
29
Spatial Control
40
Composite Frameworks
50
Summary
56
Distance Transformations
141
Generalized Voronoi Diagrams
152
The Spatial Component
167
Data Quality Applications of Neighborhood Operations
181
A Family of Problems with
201
Transformations
207
A Taxonomy for Transformations
218
Examples of Transformations
224

Representation Models and Data Structures
62
Conversion of Existing Documents Digitizing
69
Closing the Loop
77
Summary
87
TRANSFORMATIONS AND OPERATIONS
89
Interaction of Attribute and Spatial Components
98
Overlay Integration of Disparate Sources
105
Overlay for Detecting Differences
118
Summary of Transformations
230
THE BROADER CONTEXT
233
Serving Larger Goals
252
Geographic Information in the Bureaucracy
261
Information and Culture
270
Sources and Credits
283
Copyright

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