Analysis of GIS Spatial Data Using Knowledge-Based Methods

Abstract A symbolic approach to the analysis of mixed data types found in the spatial database of a Geographical Information System is developed. Unlike statistical techniques, that are essentially based on the manipulation of numeric quantities, the method here attempts to emulate photo-interpretation by manipulating symbolic representations of photo-interpretive knowledge. This representation consists of a mixture of normal and ‘defeasible’ rules. The latter enables analysis to proceed in the face of uncertainty by making (and possibly revising) assumptions about the contents of the scene being analysed. The analysis procedure is decomposed into three stages. The first deals with the analysis of data from groups of sensors (sources) providing the same type of information, the second combines the inferences of these individual analyses and the third imposes spatial consistency constraints. This decomposition implies a structuring of the knowledge, an issue that appears essential for a knowledge-based ana...

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