Sub-bottom and Bathymetry: Contacts aren’t just for Sidescan!

Chesapeake Times, Vol 8 | January 2022 One of the most powerful tools in the sidescan post processing arsenal of SonarWiz is the contact, an item which location and characteristics can be captured and saved. After these contacts are created on sidescan files they can be edited, measured, classified, and final reports can be built for your customer in a variety of formats. But did you know that users processing multibeam and sub-bottom data can also utilize these features? For sub-bottom data, contacts can be placed in the digitizing view similarly to drawing reflectors. In a situation where the user …

Mind the Gap – in Sidescan

Chesapeake Times, Vol 7 | October 2021 The traditional sidescan system with port and starboard channel have the inherent “space” between the channels when viewing the data. Once bottom tracked, the two sides get stretched to form a filled area. However, the imagery at and close to nadir is never ideal; identifying targets are difficult, and any shadows from them would be small. Standard operation would be to run additional sidescan lines offset from the original line, with good imagery to fill in the data at the nadir area. A decent solution but one that comes with a penalty. A …

Quick Survey Time Estimation

Chesapeake Times, Vol 7 | October 2021 There are a handful of tools in SonarWiz, that, together, can help you make quick work of putting together a survey time estimate. After creating a project in the intended location/zone, create or import a closed polygon feature matching the area to be surveyed. In this example I’ll import a 1.8km x 1.9km rectangle from a shapefile; if no vector representation of the area is available, making a closed polygon feature by hand will do for a quick estimate.  Right-click the Features node of the Explorer tree and select “Import…” to open the feature …

Applying Antenna Elevations SonarWiz

Chesapeake Times, Vol 6 | July 2021 When real-time kinematic (RTK) corrections are available in the survey area, it is possible to achieve sub-decimeter vertical positioning of the sonar system without the need to apply tides or vessel squat measurements. Bathymetry collected in this way is referenced to the satellite ellipsoid rather than to the more conventional orthometric or tidal datum, so it is usually required to apply a vertical transformation to move the bathymetry into the desired output datum. SonarWiz has all the tools needed to perform these calculations in a straightforward workflow.  Navigation and Attitude Editor  The first …

2D & 3D Drawing Improvements in SonarWiz

With the release of SonarWiz 7.5, Chesapeake introduced a drawing cache mechanism designed to allow for compact storage of, and quick access to, large bathymetric point clouds for display within the 3D viewer. This cache allows for much faster loading and drawing of large surveys by varying the level of detail shown to match the point of view, data loaded, and resources available. For SonarWiz 7.6, the drawing cache enhancements have been applied to the 2D plan view display, greatly improving drawing performance there as well. Previously, SonarWiz would draw bathymetry on the plan view by iterating through nearly the full set …

Beam Performance Test

By Harold Orlinsky, General Manager Beam Performance Test new to SonarWiz 7.6If you’ve ever been asked – how good is your multibeam system, don’t fall into the trap of just looking at the system specification for the sonar. It’s not the answer you need. You need to consider everything that goes into the system to come up with an answer. One method is the Beam Performance Test, a new module in SonarWiz. The program provides the user with information about each beam and measures differences along the swath, providing a snapshot of how the overall system is expected to perform …