Parent Layer: Backscatter – Seafloor Reflectivity

Name: 2004-2018 Tortugas Ecological Reserve North and South

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Description: This georeferenced image is a 5 meter resolution backscatter mosaic that was collected aboard the NOAA research vessels Nancy Foster and Thomas Jefferson during cruises from 2004 to 2018. Backscatter is the measurment of relative intensity of the seafloor and is used to delineate bentic habitat types (hard vs. soft). The seabed elevation and acoustic imagery data (backscatter) were collected using multibeam echosounders (MBES). The data were preliminary processed and corrected for motion, sound speed, and other major artifacts before assessment by Geodynamics. However, the data were only semi-cleaned, contained various artifacts, and converted with the real-time tide. Therefore, Geodynamics was contracted to complete a full review of the data and apply a NOAA Tide Zone Definition File (ZDF) to permit CCFHR’s later use of the data for characterizing Florida Keys National Marine Sanctuary (FKNMS) and adjacent areas bottom habitats. The corrected bathymetry base surface will be used to interpret the seafloor topography habitat types and extend the range of existing habitat map products that were created by manual interpretation of satellite imagery. The acoustic imagery (backscatter) aspect of the data will help further this interpretation. However, Geodynamics was not responsible for processing backscatter data but were responsible to ready the backscatter data for eventual processing.

Copyright Text: NOAA/NOS/NCCOS Attn: Dr. Chris Taylor 101 Pivers Island Road Beaufort, NC 28516-9722 Geodynamics, LLC. 310-A Greenfield Drive Newport, North Carolina 28570

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