Download GIS : A Computer Science Perspective by Michael F. Worboys PDF

By Michael F. Worboys

This goals to make the computing ideas underlying geographic databases comprehensible and obtainable to present and power clients of such platforms. It overviews database process philosophy; describes database ideas eg garage, retrieval, structure, conceptual modelling, and database querying.It then specializes in the features of GIS, spatial information and spatial databases, concluding with a dialogue of current/future examine tendencies.

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The life-cycle begins with analysis, when the issue of what the system is required to do is clarified. Following analysis comes design, when the problem of how the system will satisfy its requirements is tackled. The translation of the design into something that really works is the implementation stage, which may be the customization of a proprietary system. Following that comes continued usage and maintenance. This sequencing of activities in system development is not meant to suggest a strict temporal dependency between stages.

Main memory is randomly accessible. The access time is invariant of position of data on the medium. Associative access: To the precise location, based upon the contents of the data cell. All cells are accessed simultaneously and their data matched against a given pattern. Data items in cells for which there is a match are retrieved. Some cache memories use associative access. 6 Output devices There is a variety of devices that may be used to present the information resulting from computational analysis to the user.

Access methods provide the means of getting data items into and out of computer storage. They come in four main types: sequential, direct, random and associative. These types are distinguished as follows: Sequential access: Made in a specific sequence. The magnetic tape device is an example of a sequential access device. 17 Schematic of a single magnetic disk assembly. 34 GIS: A COMPUTING PERSPECTIVE a magnetic tape and it is required to access all the records for Stoke, then each block of data would be read in sequence, records within the block examined and retrieved in the case that they were Stoke records.

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