Apparatus for generating road information from stored digital map database
US6381536B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 2000 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Jun 21, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/09
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A road information generating apparatus has a stored digitized map database having data identifying roads on a route. The roads of the map database are stored as road segments each having endpoints. The apparatus cancels data defining selected road segments that fall outside of a predetermined window about a predetermined circle approximating a predetermined road curve. The apparatus determines circles each approximating a portion of unselected road segments. The apparatus compares a radius of each of the circles with a predetermined radius value. The apparatus produces road information on acute curve in response to result of comparing the radius of each curve with the predetermined radius value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.