Updates to Gains in 7.07.05

Chesapeake Times, Vol 5 | April 2021 In SonarWiz 7.07.05 we will be introducing several changes to the sidescan and sub-bottom gain dialogs to make them easier to use and to support a new workflow for EGN. We’ve also removed an undocumented normalization step in gain processing that dates back to the 8-bit era of SonarWiz. Taken together, these changes may affect how your processed data looks, especially if you stack gains to achieve a particular effect. We hope that the changes make it easier to understand how gains are being applied to your data. A bit of SonarWiz HistoryUntil …

Seafloor Multiple Reflections in Sub-bottom Profiles

Chesapeake Times, Vol 2 | July 2020 The interpretation of marine seismic profiles is complicated by the fact that operators must separate useful information about subsurface geometry from a wealth of background interference and noise typical of marine surveying. One of these problems is the presence of multiple reflections or reverberations. These slowly decaying wave trains usually arise in the water layer, which tends to trap the sound wave bouncing back and forth between the seabed and the sea surface. The most prominent of these multiples and usually the first to arrive are harmonics associated with the seafloor reflection. Take for example the …

Enhancements of Sub Bottom Profiler Modules

Chesapeake Times, Vol 2 | July 2020 Among the changes scheduled for the upcoming 7.7 release of SonarWiz are a number of improvements in the SBP modules. Several exciting features are in the development and testing pipelines to aid in the importing, processing and interpreting workflows – things like automated import from a monitored folder, assisted reflector tracking, multiple detection, and improvements to alignment to bathymetric surfaces. In this article, though, I’d like to talk about a couple of simpler improvements in the SBP modules, particularly in the processing window. These improvements have been in the works, and conditionally available or …

Sidescan Webinar Q&A

This is a list of questions and answers that accompanied our webinar “Sidescan Mosaic Tips”, held June 10, 2020. This webinar lasted one hour and covered Sidescan theory and tips on how to make better mosaics. Please see Training > Webinars & Recordings to view the webinar.

A-B Change Detection for Sidescan

By Howard Unkeles and Harold Orlinsky Creating a sidescan mosaic for a survey is easy. And doing a second survey is also easy. You can even use the same line plans, as the area is known. But what’s difficult is to find any differences between the two. A visual inspection will find new features, or if there if something moved. But imagine doing this for a huge survey area, a 1:10,000 boat sheet or an area like the Port of Los Angeles. This inspection would take a while, and subtle differences might be overlooked. In the upcoming release, we created an automated tool to analyze …

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(You can also seek the help of 3D animation studio experts to get your project animation done). 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 …

Forward Looking Sonar for Sidescan

By Chris Favreau, Program Manager We are adding support for Forward Looking Sonar (FLS) systems to SonarWiz 7.6. While the data for FLS systems look similar to other sonar systems such as Side Scan Sonar (SSS), FLS data is different and presents its own challenges. The FLS data is presented as a snapshot much like a video frame. It can be thought of as an acoustic video camera. This yields many frames per second resulting in a large amount of overlapping data. Each frame consists of multiple beams spread over the field of view (FOV). These beams have an area of …

Processing Multibeam Imagery in SonarWiz

By David Finlayson, Chief Scientist Multibeam echo sounder (MBES) imagery has improved dramatically in recent years and each new version of SonarWiz has introduced improved tooling for working with these data. Most of SonarWiz’s image processing and targeting tools are now also available for MBES systems. In this article we will take a look at the two different approaches offered by SonarWiz for processing MBES image data. A MBES image differs from traditional sidescan (see Figure 1). Each beam in a MBES is roughly equivalent to a complete side scan channel. To create an MBES image, the portion of the …

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 …