Figure 5. Detailed image of (A) sidescan-sonar imagery from National Oceanic and Atmospheric Administration survey H11044 and (B) enhanced imagery. The backscatter tones in groups of adjacent lines were matched to surrounding backscatter tones, as were tones of individual lines and segments. The high backscatter associated with an elongated bathymetric ridge is more easily delineated in the enhanced imagery. Lighter tones represent higher backscatter, and darker tones represent lower backscatter. Locations of images shown in fig. 4.