Analytic mapping and geographic databases by G. David Garson

By G. David Garson

The options of analytic mapping and of geographic info structures (GIS) became more and more vital instruments for studying census, crime, environmental and purchaser facts. The authors of this important quantity speak about information entry, transformation and practise matters, and the way to pick the perfect analytic images suggestions via a overview of assorted GIS and customary information assets, reminiscent of census items, TIGER documents, and CD-ROM entry. They describe each one process, evaluation its assumptions and standards and supply illustrative output for pattern info utilizing chosen software program. Researchers and directors who have to deal with facts of geographic destinations will locate this ebook an invaluable consultant to structures for storing, retrieving,

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User-defined parameters can also be set whereby if gaps are detected by the program it will automatically correct them according to logical convention. Features are organized into layers in a GIS. Various layers may contain political boundaries, census boundaries, roads, streams, or police station points. The coordinates for these are stored in region layer files, line layer files, or point layer files, depending on the nature of the contents. This form of organization allows map overlays to be turned on and off for different views of the data, and the intersections of different layers can be used to create new layers.

FMS/AC software, for instance, supports network analysis, allowing the user to work inside a GIS map interactively to turn switch points on or off, logically connect network features, and trace network branches. The records that pertain to any given network trace can be isolated and their attributes examined. Seriation Seriation is a classification procedure that has been used in archaeology, linguistics, geography, and other disciplines. , archaeological sites) by multiple criteria. Seriation can be as simple as the ordering of sites by frequency of occurrence of certain types of pottery (Larson & Michaelsen, 1990).

2; Richardson & Adler, 1972; Synder, 1987). Nyerges and Jankowski (1989; Jankowski & Nyerges,1989) have developed an expert system to help users determine which projection is appropriate to their research needs. In general, equidistant projections are best for general reference maps. Conformal projects are usually preferred for navigation, meteorology, military applications, and large-scale maps. Equal-area projections are used for statistical distribution maps (Maling, 1973). For educational use in illustrating projections, the World Projection and Mapping System is microcomputer software capable of displaying some 200 named map projections, allowing the user to set scale and rotation.

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