Storage medium for map data, method for generating maps, and navigation device

摘要

A storage medium on which geographic data of a geographic region are stored together as map units, a corresponding method for generating a map from the geographic data, and a corresponding navigation device. In order to reduce the amount of data to be processed, the map units are structured hierarchically, map units of an nth order respectively corresponding to one geographic partial region, n being a natural number, and map units of an (n+1)th order respectively corresponding to one geographic subregion of one of the partial regions.

主权项

1. A non-transitory, computer-readable storage medium, having computer program instructions, which when executed by a processor perform a method for generating a map using geographic data of a geographic region that are stored together as map units, wherein the map units are hierarchically structured, map units of an nth order respectively correspond to a geographic partial region, n being a natural number, and map units of an (n+1)th order respectively correspond to a geographic subregion of one of the partial regions, the method comprising:
determining boundaries of the geographic region using map units of a first order; querying map units of a map-unit database to select map units of at least one second order by reading identifiers that indicate that the selected map units contain a specified geographic data type, the at least one second order being higher than the first order, the selected map units being within the boundaries of the geographic region; reading the selected map units of the at least one second order having the specific geographic data type from the map-unit database; and displaying a map image by simultaneously displaying data of the map units of the first order and the selected map units of the at least one second order; wherein the displayed data of the map units of both the first and selected at least one second order include symbolic representations of the geographic data.