Map display apparatus storing data of physically adjacent map sections in physically adjacent storage locations
US4937572A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1988 |
| Grant date | Jun 26, 1990 |
| Priority date | — |
| Expiry date | Aug 9, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/3878
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A map display apparatus displays a map of a desired district in accordance with stored map data. The apparatus includes a recording medium storing map data of a map to be displayed in a manner that the whole area of the map is divided into a plurality of districts and the map data are successively stored starting from the nearest district, a display district selecting device for selecting the desired map district to be displayed, a control unit for reading the map data of the selected district from the recording medium and generating a control signal for displaying the thus read map data, and a display responsive to the control signal to display the map of the selected district. The map data of each district includes duplicate map data of the boundary parts of the adjoining districts. Map data of adjacent districts are stored in adjacent memory locations. Thus, the map data of the desired district can be displayed quickly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.