Map data base management method and system therefor

Details Map data base management method and system therefor Map data base management method and system therefor

1997-10-23

2000-09-26

Fetting, Anton W.

Data processing: database and file management or data structures

Database design

Data structure types

701200, 701201, 701207, 701208, 701209, 701212, 707102, 707 2, G06F 1730

Patent

active

061253677

ABSTRACT:
A map data base management system comprises a map data base storage unit 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 unit determines region indices corresponding to desired longitude and latitude and a scale applied from the external, and reads the map data corresponding to the desired scale and the determined region index from the map data base storage unit to then output the read data. A display unit displays the map data output from the map management unit. 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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