By G. David Garson
The options of analytic mapping and of geographic details platforms (GIS) became more and more vital instruments for reading census, crime, environmental and buyer facts. The authors of this crucial quantity talk about info entry, transformation and instruction matters, and the way to choose the correct analytic snap shots concepts via a evaluate of assorted GIS and customary info resources, equivalent to census items, TIGER documents, and CD-ROM entry. They describe each one technique, overview its assumptions and specifications and supply illustrative output for pattern facts utilizing chosen software program. Researchers and directors who have to deal with info of geographic destinations will locate this booklet an invaluable consultant to structures for storing, retrieving,
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Extra info for Analytic mapping and geographic databases
The cylindrical equal-area projection, using standard parallels of 30 degrees, produces a rectangular map with the least angular distortion of any equal-area map, though it "doesn't look right" to people used to Mercator and other common projections. The Mollweide projection, which produces an oval map, has least distortion in middle latitudes and is Page 8 sometimes used to portray world population and other distributions. The sinusoidal equal-area projection creates an onion-shaped map such that parallels appear to be equally spaced, useful for emphasis on latitudinal relations and sometimes used for maps of South America.
Streets. TIGER can be joined to a GIS software package such as Safari (by Geographic Data Technology). After the researcher has selected the appropriate data set and software, he or she can turn directly to analytic mapping. The authors review the many types of mapsUBC, dasymetric, block, isarithmic, to name a fewand explain myriad intriguing, seldom-seen summary statistics, such as geographic means, location quotients, and areal correspondence. Statistical appreciation leads to actual modeling with maps, Page vi where multivariate regression techniques may be pursued, as GIS software is interfaced with standard statistical packages such as SAS.
Systems such as CAMS can provide a clearer basis for analysis of such management decisions as assigning police patrols, interpreting case patterns, targeting education efforts, and planning facilities such as lighting. Microcomputer packages such as MapInfo are now used in most police departments to automate the process of producing maps of police jurisdictions with "pin" information on crime occurrence (Robb, 1990, p. 15). RealTime MapInfo can even link to satellite technology to track police cars and map their movement on maps that change in real time (Schroeder, 1991).
Analytic mapping and geographic databases by G. David Garson