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Map data base management method and system therefor
Map data base management method and system therefor
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机译：地图数据库管理方法及系统
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摘要
A map data base management system comprises a map data base storage unit (11) for storing a map index file so that with respect to regions partitioning each of maps drawn on a plurality of scales involved with the same geographical area, an individual region index is designated to a region, in the manner that a region index for designating each region constituting a relatively large-scale map determines region indices for designating a plurality of regions constituting a map of a scale just below the relatively large-scale; and a map data file so that among regions designated by region indices, individual map data is designated by a scale and a region index, in the manner that each region having land in a corresponding scale map has corresponding map data and each region having no land in a corresponding scale map has no map data. A map management (13) unit determines region indices corresponding to a desired longitude and latitude and a scale applied from the external via an input unit (12), and reads the map data corresponding to the desired scale and the determined region index from the map data base storage unit (11) to then output the read data. A display unit (17) displays the map data output from the map management unit (13). Accordingly, the present invention manages the map data involving the maps of various scales via the formalized index structure and the hierarchical structure. Thus, the size of the map index file can be minimized and the search of the map data can be simply performed via simple calculation. Also, a region is classified into one having land and the other having no land in each scale, which can enable constitution of the map data base with only geographically useful map data. Thus, a map data base can be efficiently constructed.
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