Map database apparatus
US6128573A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1997 |
| Grant date | Oct 3, 2000 |
| Priority date | — |
| Expiry date | Oct 22, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/387
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A map database apparatus according to the present invention stores a plurality of sets of link string data provided separately to correspond to maps at different scales representing a road as a link string constituted by connecting a plurality of links each having a node at a front end and a rear end thereof. In the map database apparatus, a level correlation link number is provided as data that indicate a link string in a lower order level at a larger scale that is common to a link in a higher order level at a smaller scale, the level correlation link number having a level number of the higher order level and a link number of the common link in the higher order level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.