Accuracy verification of a vessel-mounted laser scanner and its application to hydrographic surveys.
A technology has been developed to measure topographies and features on land in three dimensions using a vessel-mounted laser scanner while performing multibeam echo sounders. As a first step to examining whether this technology can be used in hydrographic survey for nautical charting, we tried to measure the coastline using a laser scanner. In this trial measurement, we devised procedures of bias value measurement and accuracy confirmation and verified the horizontal position accuracy of the point cloud data measured by the laser scanner. Accuracy verification showed that there was almost no difference between the position of point cloud data measured by the laser scanner in calm sea and the coastline measured by the kinematic GNSS, so we concluded it can be used to draw the coastline on nautical charts. On the other hand, the measurement accuracy was inferior in rough seas. In addition, measurement by laser scanner enables the precise measurement of the coastline such as wave-dissipating blocks and is expected to be applied to vertical clearance measurements under bridges and position measurement of buoys and fishing implements.
| Main Authors: | , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
2023
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| Online Access: | http://hdl.handle.net/1834/42589 |
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| Summary: | A technology has been developed to measure topographies and features on land in three dimensions using a vessel-mounted laser scanner while performing multibeam echo sounders. As a first step to examining whether this technology can be used in hydrographic survey for nautical charting, we tried to measure the coastline using a laser scanner. In this trial measurement, we devised procedures of bias value measurement and accuracy confirmation and verified the horizontal position accuracy of the point cloud data measured by the laser scanner. Accuracy verification showed that there was almost no difference between the position of point cloud data measured by the laser scanner in calm sea and the coastline measured by the kinematic GNSS, so we concluded it can be used to draw the coastline on nautical charts. On the other hand, the measurement accuracy was inferior in rough seas. In addition, measurement by laser scanner enables the precise measurement of the coastline such as wave-dissipating blocks and is expected to be applied to vertical clearance measurements under bridges and position measurement of buoys and fishing implements. |
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