Name: Moderate Depth Backscatter (10 m)

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Description: This image represents a 10x10 meter backscatter surface for areas inside Buck Island Reef National Monument (BIRNM). Backscatter is the relative amount of sound reflected from the seafloor. This amount is indicative of the physical properties of the seafloor (i.e., how rough/smooth/soft/hard it is), which is important information when characterizing benthic habitats. It was collected by NOAA on two separate missions. On the first mission (from 2/18/2004 to 3/5/2004), depths between 12 and 317 m were surveyed from using a pole-mounted 240 kHz Reson Seabat 8101 Extended Range MBES, producing a 5x5 m bathymetry and 0.5x0.5 m backscatter surface. On the second mission (from 3/21/2006 to 4/2/2006), depths between 16 and 1,000 m were surveyed using a hull-mounted 95 kHz Simrad 1002 MBES, producing a 10x10 m bathymetry and 3x3 m backscatter surface. For both missions, soundings were positioned relative to the horizontal coordinate system (NAD83 UTM 20 N) and to the vertical coordinate system (MLLW). Both backscatter surfaces were geometrically corrected for navigation attitude, transducer attitude and slant range distortion and radiometrically corrected for changes in acquisition gains, power levels, pulse widths, local seafloor slope and ensonification areas using Geocoder software. These backscatter images (along with depth and derivatives of depth) were used to develop a new benthic habitat map for BIRNM in 50 to 1,000 meters of water.

Copyright Text: NOAA/NOS/NCCOS/MSE/Biogeography Branch

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