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St. Petersburg Coastal and Marine Science Center

Data Release

Subbottom and Sidescan Sonar Data Acquired in 2015 From Grand Bay, Mississippi and Alabama

By Stanley D. Locker, Arnell S. Forde, and Christopher G. Smith


Grand Bay Alabama and Mississippi were surveyed between May and June 2015, using an Edgetech chirp 424 subbottom profiler and a Klein 3900 sidescan sonar. The objective was to characterize the geologic framework of recent estuarine sediment accumulation in the bay. This data release includes the raw chirp subbottom Society of Exploration Geophysicists (SEG Y) data files, sidescan data files in eXtended Triton Format (XTF), and a processed sidescan sonar mosaic GeoTIFF.


*Very large files may require long download times, depending on internet speed.
File Name and Description Metadata (XML format) Metadata (text format) Download File
Unprocessed digital chirp subbottom trace data (.sgy)
GrandBay_2015-315-FA_metadata.xml GrandBay_2015-315-FA_metadata.txt
(2.6 GB)
Unprocessed Klein SonarPro xtf data files (.xtf)
Same as above Same as above
(9.84 GB*)
Processed sidescan sonar backscatter imagery merged into a mosaic at 30 centimeter pixel resolution.
NOTE: Backscatter intensity is represented by a gray-scale pallet with high backscatter intensities as darker grays (.tif, .txt)
Same as above Same as above
(578.4 MB)
Survey trackline locations (.mxd, .shp, .txt)
Same as above Same as above
(64.9 MB)
Supplemental Information
Geophysical logs and vessel configuration diagram (.pdf, .jpg)
Not applicable Not applicable
(776 KB)

Map of Grand Bay, Mississippi and Alabama, showing the 2015 survey tracklines, with inset of regional location map.
Figure 1. Trackline coverage for chirp and sidescan data acquisition.

Suggested Citation

Locker, S.D., Forde, A.S., and Smith, C.G., 2018, Subbottom and sidescan sonar data acquired in 2015 from Grand Bay, Mississippi and Alabama: U.S. Geological Survey data release,

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Page Last Modified: September 26, 2018 @ 03:42 PM (JSG)