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St. Petersburg Coastal and Marine Science Center

Data Release

Multibeam Bathymetry Data Collected in 2016 from Grand Bay Alabama/Mississippi

By Chelsea A. Stalk, 1 Jake J. Fredericks, 2 Stanley D. Locker, 3 and Cody S. Carlson 4

1 Cherokee Nation Technologies
2 U.S. Geological Survey
3 University of South Florida College of Marine Science
4 Seafloor Systems Incorporated


The U.S Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center (SPCMSC) conducted a reconnaissance multibeam bathymetry (MBB) survey in Grand Bay Alabama/Mississippi on May 12th, 2016, as an assessment of the shallow water capabilities of a Teledyne Reson SeaBat T50-P multibeam echosounder. The survey is a part of an ongoing wetland/estuarine sediment study being conducted by the Sea level and Storm Impacts on Estuarine Environments and Shorelines project (SSIEES). The objective was to determine the feasibility of imaging eroding marsh edges at areas of interest around the bay. To extend horizontal coverage and map the eroding marsh edge, the T50-P head was tilted at an angle of 30° towards the port side of the vessel. Over 12 line-kilometers of data were acquired at three survey sites; Site 1 at the mouth of Bayou Heron, Site 2 in the south-western portion of Grand Bay, and Site 3, located in the western portion of Middle Bay. Data are provided in x,y,z format at a 0.50 meter spatial resolution in the World Geodetic System of 1984 (WGS84), the North American Datum of 1983 (NAD83, [2011]) and the North American Vertical Datum of 1988 (NAVD88), model GEOID12A.  For further information regarding data collection and/or processing please see the metadata associated with this data release.


File Name and Description Metadata (XML format) Metadata (text format) Download File
0.50 m resolution xyz data provided in WGS84, NAD83, and NAD83 NAVD88 GEOID12A, sorted by datum and site (.txt)
(7.1 MB)
Multibeam bathymetry survey tracklines (.shp)
(4.4 MB)

Graphic map showing the locations of the 3 sites surveyed for the 2016 multibeam bathymetry survey within Grand Bay Alabama/Mississippi
Figure 1. Location map of the three sites surveyed for the 2016 multibeam bathymetry survey within Grand Bay Alabama/Mississippi. Study area extent is indicated by the red box within the regional map. Base map modified from USGS 1:100,000-scale Digital Line Graph (DGL) data.

Suggested Citation

Stalk, C.S., Fredericks, J.F., Locker, S.D., and Carlson, C.S., 2018, Multibeam bathymetry data collected in 2016 from Grand Bay Alabama/Mississippi: U.S. Geological Survey data release,

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