Horizontal Calibration of Vessels with UASs

Abstract

Knowledge of offset vectors from vessel mounted sonars, to systems such as Inertial Measurement Units and Global Navigation Satellite Systems is crucial for accurate ocean mapping applications. Traditional survey methods, such as employing laser scanners or total stations, are used to determine professional vessel offset distances reliably. However, for vessels of opportunity that are collecting volunteer bathymetric data, it is beneficial to consider survey methods that may be less time consuming, less expensive, or which do not involve bringing the vessel into a dry dock. Thus, this article explores two alternative methods that meet this criterion for horizontally calibrating vessels. Unmanned Aircraft Systems (UASs) were used to horizontally calibrate a vessel with both Structure from Motion photogrammetry and aerial lidar while the vessel was moored to a floating dock. Estimates of the horizontal deviations from ground truth, were obtained by comparing the horizontal distances between targets on a vessel, acquired by the UAS methods, to multiple ground truth sources: a survey-grade terrestrial laser scan and fiberglass tape measurements. The investigated methods were able to achieve horizontal deviations on the order of centimeters with the use of Ground Control Points.

Keywords:

• Bathymetry
• crowdsourced bathymetry
• remote sensing
• unmanned aerial systems
• vessel calibration

Acknowledgement

The authors would like to thank the Captain and crew of the R/V Gulf Surveyor for their help throughout the data collection process.

Declaration of interest

The data supporting the conclusions of this article are included within the article. Any questions regarding these data can be directed to the corresponding author.

Additional information

Funding

This work was supported by the National Oceanic and Atmospheric Administration (NOAA) under Grant NA15NOS4000200 to the Joint Hydrographic Center at the University of New Hampshire.