| 摘要 |
PURPOSE: An underground facility management system with a magnetic marker is provided to measure a location with the magnetic marker and construct a database and manage a underground facility by connection with GIS. CONSTITUTION: Sensor units(12,13) arrange a plurality of magnetic vector sensors on a parallel line. The sensor units offset an earth magnetic field and sense only a distorted magnetic field. A magnetic marker unit displays the direction and the size of a distorted magnetic field sensed in the sensor units as graphic. The magnetic marker is attached to a cylindrical pipe.
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