Abstract
Abstract : The Defense Mapping Agency (DMA) has tasked the Naval Oceanographic and Atmospheric Research Laboratory (NOARL) to develop a product specification for a Digital Nautical Chart (DNC) database. The DNC will be used by the Department of Defense in nautical Electronic Chart Display and Information Systems. This paper will describe the structure and content of the DNC database. The DNC database will be implemented in DMA's Vector Product Format (VPF). VPF is a generic geographic data model designed to be used with any geographic data model in which vector data can be represented using nodes, edges, and faces. VPF is based upon the georelational model, combinatorial topology, and set theory. VPF is a new data model, upon which only prototypes of the Digital Chart of the World and digital Terrain Data databases have been produced. The DNC database will use DMA's Feature and Attribute Coding Standard to describe data and will include all features now found on paper Harbor, Approach and Coastal charts. Additional data may be included to support Navy requirements. The DNC will be a seamless, tiled database.
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