Mapping & Surveying: Spatial Analysis
Post-processing of acoustic images with QTC SIDEVIEW and QTC IMPACT
Image-based seabed classification is the organization of bottom types (seabeds, lake beds, river beds) into discrete units based on a characteristic acoustic response. Seabed classification can be completed in a variety of ways, including with manual inspection of raw images and automated classification software. Automated classification characterizes acoustic diversity not the physical properties of the seabed; therefore, ground-truthing to determine precise associations of acoustic signals with benthic habitat is essential.
QTC SIDEVIEW (used with side-scan sonar imagery) and QTC IMPACT (used with echo-sounder data) are integrated software packages developed by Quester TangentTM that classify sediments using the statistical properties of backscatter images. These packages include tools to perform quality assurance, analysis and classification. The processing steps outlined below include compensation of raw images, generation of continuous rectangles to overlay on images, generation and clustering of image descriptions, and selection and mapping of optimal acoustic signal classes.
Sidescan sonar of Mobjack Bay reef
Data processing steps and decision branches for classification of acoustic sonar images in QTC SIDEVIEW and CLAMS.
Similar procedures apply for QTC IMPACT when processing echo-sounder data.