Crowdsourced bathymetry on the Great Barrier Reef: total propagated uncertainty
September 15, 2021

Authors: Beaman, R.J.

Year: 2021

Publication: CSB on the Great Barrier Reef: total propagated uncertainty, IHO Crowdsourced Bathymetry Working Group 11th Meeting, 14 Sept to 16 Sept 2021. International Hydrographic Organization (IHO), Monaco (Virtual meeting).

Abstract

The “Crowdsourced bathymetry on the Great Barrier Reef” project has been running since 2018 and currently has nine volunteer vessels throughout the Great Barrier Reef installed with SmartLog data loggers that capture position and depth data. The question of data accuracy of crowdsourced bathymetry (CSB) data is often raised.

To help answer this question, we referred to the IHO Standards for Hydrographic Surveys, 2020. IHO Publication No. 44, IHO, Monaco, pp. 49., and aimed to generate uncertainty values for CSB data:
(1) a priori total propagated uncertainty with Caris HIPS software
(2) empirical values standard deviation comparison with bathy LiDAR data.

Our results found:
CSB data a priori total vertical uncertainty +/-0.5-0.6 m (95% confid level)
CSB data a priori total horizontal uncertainty +/-7.37 m (95% confid level)
CSB data empirical comparison with LiDAR +/-0.80-0.96 m (95% confid level)

So is reasonable to say that CSB data TVU +/-~1 m (95% confid level), and CSB data conforms to IHO S-44 Order 1b or (minor) Order 2.

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