Denso Corporation

Other

Denson Corporation

Yoshimasa Furuike

Kazuyoshi Tamaki

Takao Mitsui

Hiroshi Takeuchi

Yasuhiro Tooyama

Isao Ogawa

Hidenobu Suzuki

A database managing apparatus, which can immediately obtain desired data from a database. A database managing apparatus includes a CPU, an input/output device, a main memory and an external memory. The CPU has a controller that initially obtains one article record from stored records via the input/output device. The controller reads out definition data in a database definition file. Then, the controller classifies the obtained records according to attributions based on the definition data. The controller does not compress the data regarding the record group belonging to the attribution A, which is the record group to be searched, but compresses data regarding the record groups belonging to the attributions B-E, which are the record groups other than the record group to be searched. As a result, the controller can reduce the unnecessary decompression of record data belonging to other attributions than the attribution to be searched. As a result, the controller can quickly retrieve the requested record.

Database managing apparatus and database record retrieving apparatus

Map data is divided into meshes of a prescribed size. Treating four meshes as one group, mesh numbers are assigned to the meshes following an N pattern. After numbers are assigned to the four meshes, these four meshes are collected as one, and numbers are assigned to respective meshes following an N pattern. The map data storage medium stores the map data according to mesh number. As a result, data portions for areas located in close proximity are positioned in close proximity in the map database (storage medium), to thereby improve access efficiency.

Map data storage medium

A map of an entire region is divided into sections of a square of 900', each of which is further divided into blocks of a square of 30', each of which is further divided into units of a square of 1', so that a region on the map can be hierarchically designated. Each section is defined with section codes of three figures; each block is defined with block codes of three figures in accordance with its relative positional relation in the section; and each unit is defined with unit codes of three figures in accordance with its relative positional relation in the block, so that each unit can be completely differentiated with an intrinsic code of nine figures composed of those three kinds of codes. As to the section code composing the intrinsic code corresponding to the predetermined region, moreover, a number of significant digits is reduced by assigning a lower number in the code system, so that the manual operations of inputting the intrinsic code of the predetermined region can be lightened.

System and method for designating points on a map using reduced

Growing community of inventors

Nukata-gun, Japan

Yoshimasa Furuike