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St. Petersburg Coastal and Marine Science Center

Data Release

Archive of Chirp Subbottom Profile Data Collected in 2018 From the Northern Chandeleur Islands, Louisiana

By Arnell S. Forde, Nancy T. DeWitt, Jake J. Fredericks, and Jennifer L. Miselis


As part of the Barrier Island Evolution Research Project, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center conducted a nearshore geophysical survey around the northern Chandeleur Islands, Louisiana, in August of 2018. The objective of the project is to improve the understanding of barrier island geomorphic evolution, particularly storm-related depositional and erosional processes that shape the islands over annual to interannual timescales (1–5 years). Collecting geophysical data can help researchers to identify relationships between the geologic history of the island and its present-day morphology and sediment distribution. High-resolution geophysical data collected along this rapidly changing barrier island system can provide a unique time-series dataset to further the analyses and geomorphological interpretations of this and other coastal systems, improving researchers understanding of coastal response and evolution over medium-term time scales (months to years).

This data release serves as an archive of subbottom profile and navigation data collected August 16–21, 2018, offshore of the northern Chandeleur Islands, during USGS Field Activity Number 2018-350-FA. Data products, including unprocessed digital chirp subbottom data, survey trackline map, navigation files, processed profile images, geographic information system (GIS) files and formal Federal Geographic Data Committee (FGDC) metadata, and field logs are provided. For additional information regarding data acquisition and processing methods, refer to USGS Data Series 1077.


File Name and Description Metadata (XML format) Metadata (text format) Download File
Unprocessed digital chirp subbottom trace data (.sgy)
2018-350-FA_metadata.xml 2018-350-FA_metadata.txt
(897 MB)
Navigation data (.txt)
Same as above Same as above
(1.39 MB)
Processed subbottom profile images (.gif)
Same as above Same as above
(19.3 MB)
Geospatial data (.mxd, .kmz, .shp)
Same as above Same as above
(21.1 MB)
Supplemental Information
Field Activity Collection System (FACS) logs, acquisition geometry, and geophysical operations log (.pdf)
Not applicable Not applicable
(597 KB)

Graphic map of the region of the August 2018 survey area, indicated by red box in the inset map, and trackline locations, shown with yellow lines.
Figure 1. Regional map showing the August 2018 survey area (indicated by red box) and trackline locations. The northern Chandeleur Islands, Louisiana, land area was derived from USGS lidar data collected in 2016.

Suggested Citation

Forde, A.S., DeWitt, N.T., Fredericks, J.J., and Miselis, J.L., 2019, Archive of chirp subbottom profile data collected in 2018 from the northern Chandeleur Islands, Louisiana: U.S. Geological Survey data release,

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