ASSESSMENT OF VERTICAL ACCURACY PERFORMANCE FROM A PORTABLE HYDROGRAPHIC SYSTEM DUE TO INSTRUMENT SPECIFICATIONS, BOAT INSTALLATION, AND LAUNCH OPERATION
Abubakar Aliyu Alhassan(a*), Poerbandono(b)

a)Department of Geodesy and Geomatics Engineering. Faculty of Earth Sciences and Technology, Institut Teknologi Bandung.

b)Hydrography Research Group, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung

Abstract

With the growing development of portable survey equipment and platforms, hydrographic data acquisition is being offered by multiple selections of devices and mode of installations. The mounting and installation of hydrographic survey devices are most of the time tailored to the boat or platform dimension. The use of portable equipment is hence indispensable with a wide selection of combined options from the market. Consequently, sensor offsets and device performance are hence unique in every survey launched. With that, persistent accuracy performance shall always be verified. This paper examines the capability of portable deployments of multibeam echosounder (MBES) on distinct types of survey boats. The examination is primarily based on error budget modeling and field tests. In this contribution, we develop an error budget model to approximate the propagating uncertainty from the contributing sources of measurement uncertainties. The model only considers the vertical sources of error in MBES survey as it constitutes the largest contributors to hydrographic data quality. Verification of the model by means of field tests is carried out on two separate locations using different boats and device^s configurations. The verification indicates our proposed model can independently identify the survey quality in accordance with the International Hydrographic Organization standards, regardless of the options of devices and their installations. This study could be beneficial in assessing the vertical accuracy of any portable survey systems and helps hydrographic surveyors to design the best strategy of device selection and installation prior to carrying out the measurement.

Keywords: Error budget, total propagating uncertainty, bathymetry, Jacobian matrix

Topic: Ocean Sciences