Map database apparatus
US5919245A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 21, 1996 |
| Grant date | Jul 6, 1999 |
| Priority date | — |
| Expiry date | Oct 21, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/387
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention is applied to a map database apparatus, where: a road is represented as a link string in which a plurality of links, each of which has nodes at both ends thereof, are connected; and a plurality of link string data, each of which includes node information relating to the node and is respectively provided for each of levels which correspond to different scale maps with regard to an identical link string, are stored. And a link of a lower level which has a larger scale, the link being common to a link of a upper level which has a smaller scale, has a link identifying data which is common to a link identifying data of the common link of the upper level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.