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Land titles -- Registration and transfer, Multipurpose cadastres -- Technological innovations, Multipurpose cadastres -- Data processing, Object-oriented programming (Computer science)

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18 pages


The challenge to designers of multipurpose computer-aided land information systems is to capture enough of the "deep structure" of the problem domain to enable a system to answer user questions and requests in a satisfactory way. Criteria defining "satisfactory" in each case must include considerations of accuracy, completeness, timeliness, and cost. These considerations, when applied to the location in space of parcel boundaries and property corners, present unusual difficulties. This is in large measure due to the fact that important elements of the field measurement process, and the determination of location based on what are essentially logical {legal) abstractions, are problematic or impossible to capture, store, and display either in the graphic object (the map) or in computer storage as presently constituted. The problem of representing these· data is approached through the use of an object-oriented computer language which treats each individual cadastral object as storing internally the method, reference object(s), and measurement(s) by which it was located in the field. The concept is tested in an application of Neon™, an object-oriented language implemented on the Macintosh™ computer.

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