Comparing Survey Results Between a Multibeam Sonar and a Multi-Channel Depth-Capable ADCP
Posted by Jerry Knisley, Last modified by
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on 21 December 2016 12:49 PM

A test was conducted using the Sontek M9 Hydrosurveyor and a R2Sonic 2024 Multibeam. The survey was conducted in January of 2016. The test area was in Providence, RI and the surveys were conducted with the assistance of the USACE. Below is an image of the area of the test.

The multi-beam survey was performed on January 22, 2016 using the R2Sonic sonar with an Applanix POS-MV, while the M9 survey was performed one week later using the Sontek M9 sonar and the same POS-MV.  The next image shows the connection diagram.

The data was processed in HYPACK using several methods. The Sontek M9 data was processed in both the SINGLE BEAM EDITOR and the MULTI-BEAM EDITOR. Below you can see the HYPACK workflow for each system.

The comparison of the data shows a very comparible reult for the contours.

With the release of HYPACK 2017 there is a new editor for processing bathy data. The program is the SINGLE BEAM EDITOR 64. This program, although the name implies a single channel editing, can handle all of the Sontek M9 channels simultaneously. The following screen captures show the power of the new editing software. The new editor allows the user to edit data for the entire survey or per line of data.

With the profile window the user can view all of the beams together or isolate a single beam to edit just one channel.

The data wsa comapred using the Cross Sections and Volumes program within HYPACK. As you will notice the multibeam system provides data in areas where the Sontek M9 did not.

The test proved that the Sontek M9 can be a very valuable tool for bathy survey and provides value in the amount of area that can be covered over the standard single sounding systems currently used for bathy survey.