Positional information providing system, navigation system, and terminal device
US9188458B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 2013 |
| Grant date | Nov 17, 2015 |
| Priority date | — |
| Expiry date | Jun 28, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/3889
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A positional information providing system is provided in which positional information including altitude can be highly accurately acquired even though a user is located outdoors or indoors. A system includes a server device including a map data storage unit, an altitude storage unit, a reference position coordinates receiving unit, a reference point altitude information generating unit locating reference position coordinates and reference point altitude, a map data transmitting unit and a reference point altitude information transmitting unit, and a terminal device including a positional information acquiring unit, a reference point information transmitting unit, a reference point altitude information receiving unit, a map data receiving unit and a reference point altitude detecting unit detecting altitude at a reference point. The terminal device includes a calibration unit for the altitude data acquired at the reference point altitude detecting unit and a map display unit displaying map data and altitude data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.