Analytic mapping and geographic databases by G. David Garson

By G. David Garson

The ideas of analytic mapping and of geographic details structures (GIS) became more and more vital instruments for examining census, crime, environmental and patron info. The authors of this crucial quantity speak about information entry, transformation and training concerns, and the way to choose the perfect analytic pictures strategies via a evaluate of varied GIS and customary information assets, resembling census items, TIGER records, and CD-ROM entry. They describe every one process, assessment its assumptions and necessities and supply illustrative output for pattern info utilizing chosen software program. Researchers and directors who have to deal with info of geographic destinations will locate this publication an invaluable advisor to structures for storing, retrieving,

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Alternatively, features can be mapped on a raster or bitmap basis, as through recording aerial photographs, just as any other image can be saved in computer files. The raster approach presents all map features simultaneously as elements in a grid and therefore lacks any relational structure. Raster image maps simply store a picture of a map as a series of pixels (points), just as one would a digitized photograph. Raster images can be edited by adjusting the colors of individual pixels (the smallest points displayable), but if images are shrunk or expanded too much, jagged edges and other distortions appear.

Mailing labels for all property owners adjacent to any parcel affected by a rezoning hearing). S. Census Bureau's TIGER (Topologically Integrated Geographic Encoding and Referencing) system has revolutionized mapping, enabling incredibly detailed analysis. Geographic information systems are now a billion-dollar industry, partly because the graphical analyses that emerge from GIS are found by decision makers to be more useful than traditional statistical analyses that dominate the social sciences.

In a second example, Fitts (1989) used computer maps to analyze the distribution of linguistic patterns among Alabama blacks based on survey research concerning responses to lexical items in the Linguistic Atlas of the Gulf States. As a third instance, Hillier (1989) has used computer-generated map data to analyze the growth patterns in English and French villages and towns, comparing settlement growth patterns to organic growth simulations. For a fourth example, a Northwestern University team helps activist community groups by providing computerized maps showing where the city government is expending its budget (McCullough, 1991, p.

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