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Single-Beam Bathymetry Data Collected in March 2021 from Grand Bay and Point Aux Chenes Bay, Mississippi/Alabama

September 17, 2021

Scientists from the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center in St. Petersburg, Florida (USGS - SPCSMC), conducted a single-beam bathymetry survey within Grand Bay and Point Aux Chenes Bay, Mississippi/Alabama, from March 3-6, 2021. Efforts were supported by the Estuarine and MaRsh Geology project (EMRG), and the data described will provide baseline bathymetric information for future research investigating wetland/marsh evolution, sediment transport, and recent and long-term geomorphic change. The data will also support modeling of future changes in response to restoration efforts and storm impacts. Final data files are released in WGS84 (G1762) ellipsoid height and NAD83 (2011), NAVD88 orthometric heights, utilizing GEOID12A. Geographic Information System (GIS) data products include: a 10 m cell-size interpolated bathymetry grid or Digital Elevation Model (DEM), trackline maps, xyz point data files and formal Federal Geographic Data Committee (FGDC) metadata. To improve The DEM result and better represent the shoreline extent of the bathymetry, shoreline data from Terrano and others (2021) was utilized to create a coverage polygon for the survey areas. Vertices were assigned a zero elevation and incorporated when generating the DEM. For further information regarding data collection and/or processing methods refer to the associated metadata and DeWitt and others (2017).

DeWitt, N.T., Stalk, C.A., Smith, C.G., Locker, S.D., Fredericks, J.J., McCloskey, T.A., and Wheaton, C.J., 2017, Single-beam bathymetry data collected in 2015 from Grand Bay, Alabama-Mississippi: U.S. Geological Survey Data Series 1070,

Terrano, J.F., Smith, K.E.L., Pitchford, J.L., Archer, M., Brochard, M., 2021, Shorelines from high-resolution WorldView satellite imagery, real-time kinematic global positioning data, and aerial imagery for 2013 to 2020 for study sites within Grand Bay National Estuarine Research Reserve, Mississippi: U.S. Geological Survey data release,