Managing Depth Information Uncertainty in Inland Mobile Navigation Systems

Rough sets theory allows to model uncertainty in decision support systems. Electronic Charts Display and Information Systems are based on spatial data and together with build-in analysis tools pose primary aid in navigation. Mobile applications for inland waters use the same spatial information in form of Electronic Nautical Charts. In this paper we present a new approach for designation of a safety depth contour in inland mobile navigation. In place of manual setting of a safety depth value for the need of navigation-aid algorithm, an automatic solution is proposed. The solution is based on spatial characteristics and values derived from bathymetric data and system itself. Rough sets theory is used to reduce number of conditional attributes and to build rule matrix for decision-support algorithm.

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