Abstract
Digital road map is a fundamental element in the Vehicle Navigation System, which in turn, is the most basic component of IVHS. Digital road map for vehicle navigation system requires the ability to represent precise location, optimal route analysis, terrain feature information, and other information on demand. In order to satisfy the above requirements, quality and accuracy standards for the digital road map must be defined from the beginning. This paper focuses on the following issues: setting up a new standard coordinate system to reduce projection errors, defining the allowable locational accuracy, networking and structuring the database items needed for route guidance, and establishing the production schemes for digital road map database.
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