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Enhanced Sidescan-Sonar Imagery, North-Central Long Island Sound


List of Figures

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List of Figures
Figure 1. Locations of National Oceanic and Atmospheric Administration (NOAA) surveys H11043, H11044, and H11045 in Long Island Sound. Figure 1. Locations of National Oceanic and Atmospheric Administration (NOAA) surveys H11043, H11044, and H11045 in Long Island Sound.
Figure 2. Photograph of National Oceanic and Atmospheric Administration (NOAA) Ship RUDE at sea. (Photo courtesy of NOAA.) Figure 2. Photograph of National Oceanic and Atmospheric Administration (NOAA) Ship RUDE at sea. (Photo courtesy of NOAA.)
Figure 3. Sidescan-sonar imagery of National Oceanic and Atmospheric Administration survey H11043 (left) and enhanced imagery (right). Artifacts are still present in the enhanced imagery and might be due to a roll in the tow fish. Lighter tones represent higher backscatter and darker tones represent lower backscatter. Images are in geographic coordinate system. Figure 3. Sidescan-sonar imagery of National Oceanic and Atmospheric Administration survey H11043 (left) and enhanced imagery (right). Artifacts are still present in the enhanced imagery and might be due to a roll in the tow fish. Lighter tones represent higher backscatter and darker tones represent lower backscatter. Images are in geographic coordinate system.
Figure 4. Sidescan-sonar imagery of National Oceanic and Atmospheric Administration survey H11044 (left) and enhanced imagery (right). Lighter tones represent higher backscatter, and darker tones represent lower backscatter. Images are in geographic coordinate system. Red rectangles show locations of images in fig. 5. Figure 4. Sidescan-sonar imagery of National Oceanic and Atmospheric Administration survey H11044 (left) and enhanced imagery (right). Lighter tones represent higher backscatter, and darker tones represent lower backscatter. Images are in geographic coordinate system. Red rectangles show locations of images in fig. 5.
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. 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.
Figure 6. Sidescan-sonar imagery of National Oceanic and Atmospheric Administration survey H11045 (top) and enhanced imagery (bottom). Lighter tones represent higher backscatter and darker tones represent lower backscatter. Images are in geographic coordinate system. Red rectangles show locations of images in fig. 7. Figure 6. Sidescan-sonar imagery of National Oceanic and Atmospheric Administration survey H11045 (top) and enhanced imagery (bottom). Lighter tones represent higher backscatter and darker tones represent lower backscatter. Images are in geographic coordinate system. Red rectangles show locations of images in fig. 7.
Figure 7. Detailed image of (A) sidescan-sonar imagery from National Oceanic and Atmospheric Administration survey H11045 and (B) enhanced imagery. Although artifacts are still present in the enhanced imagery, the striping has been minimized as much as possible. Sand waves and trawl marks are more easily distinguishable in the enhanced imagery. Locations of images shown in fig. 6. Figure 7. Detailed image of (A) sidescan-sonar imagery from National Oceanic and Atmospheric Administration survey H11045 and (B) enhanced imagery. Although artifacts are still present in the enhanced imagery, the striping has been minimized as much as possible. Sand waves and trawl marks are more easily distinguishable in the enhanced imagery. Locations of images shown in fig. 6.
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