Name: Shallow Backscatter (1 m)

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Description: This image represents a 1x1 meter backscatter (intensity) 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 from 4/9/2010 to 4/30/2010 using a pole-mounted 455 kHz Reson Seabat 8125 multibeam echosounder (MBES). Depths between 5 and 50 m were surveyed, producing a 1x1 m bathymetry and 1x1 m backscatter surface. Soundings were positioned relative to the horizontal coordinate system (NAD83 UTM 20 N) and to the vertical coordinate system (MLLW). The backscatter surface was 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. This backscatter image (along with depth and derivatives of depth) was used to develop a new benthic habitat map for BIRNM in 0 to 50 meters of water.

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

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