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 …

A New Tool for Bathy Editing

In the latest version of SonarWiz, processing bathymetry just got a little easier. (In my opinion, of course). Editing data is relatively straightforward, finding those soundings that are “flyers” or “anomalies”, which as hydrographers, we determined are invalid and need to be removed. But sometimes we miss finding the sounding and it remains in the dataset, requiring us to go back into the editor for further editing. It could be just one or two points from hundreds of thousands of good ones. SonarWiz 7.8.0 has a new editing tool to work directly on the bathy data in the main display …

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 …

Expanded CSF Sample Count Options

Chesapeake Times, Vol 6 | July 2021 Recently we’ve seen a good amount of interest in higher-resolution sidescan. Recordings can be made at 10,000 or more samples per channel, to allow for centimeter-level resolutions over relatively wide swaths. Customers want to make the most of the systems they’ve invested in and offer high-resolution deliverables. To accommodate these needs, the upcoming 7.8.0 release of SonarWiz will include some new sidescan import sample count options. Previously, sidescan files could be imported with 1024, 2048, or 4096 samples per channel. Now, a user-selectable or automatically-detected number of samples can be imported, with a …

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 …

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 …