Originator: U.S. Geological Survey
Originator: Nancy T. DeWitt
Originator: James G. Flocks
Originator: Elizabeth A. Pendleton
Originator: Mark E. Hansen
Originator: B.J. Reynolds
Originator: Kyle W. Kelso
Originator: Dana S. Wiese
Originator: Charles R. Worley
Geospatial_Data_Presentation_Form: remote-sensing image
Series_Name: USGS Data Series Publication
Publication_Place: St. Petersburg, FL
Publisher: St. Petersburg Coastal and Marine Science Center
During the summers of 2008 and 2009 the USGS conducted bathymetric surveys from West Ship Island, Miss., to Dauphin Island, Ala., as part of the Northern Gulf of Mexico (NGOM) Ecosystem Change and Hazard Susceptibility project. The survey area extended from the shoreline out to approximately 2 kilometers and included the adjacent passes. The bathymetry was primarily used to create a topo-bathymetric map and provide a base-level assessment of the seafloor following the 2005 hurricane season. Additionally, these data will be used in conjunction with other geophysical data (chirp and side scan sonar) toward constructing a comprehensive geological framework of the Mississippi Barrier Island Complex. The culmination of the geophysical surveys will provide the data necessary for scientists to define, interpret, and provide baseline bathymetry and seafloor habitat for this area and to aid scientists in predicting future geomorpholocial changes of the islands with respect to climate change, storm impact, and sea-level rise. Furthermore, these data provide information for feasibility of barrier island restoration, particularly in Camille Cut, and efforts for the preservation of historical Fort Massachusetts.
This report serves as an archive of the processed single-beam and swath bathymetry data. Data products herein include gridded and interpolated surfaces, surface images, and x,y,z data products. Additional files include trackline maps, GIS files, Field Activity Collection System (FACS) logs, and formal FGDC metadata. Scanned images of the handwritten FACS logs are also provided as PDF files. Refer to the Acronyms page for expansion of acronyms and abbreviations used in this report.
For navigational purposes, bathymetric surveys have traditionally been referenced to a water level datum using tide gages and tide models. Bathymetric measurements referenced to a Global Positioning System (GPS) is a more accurate way of representing water depth and has been implemented in the acquisition and processing procedures for these datasets. Previous single-beam bathymetric studies performed at the USGS Center for Coastal and Marine Science have successfully referenced bathymetric measurements to GPS (DeWitt and others, 2007; Hansen 2008 and 2009). These surveys were conducted as a test to develop acquisition technology utilizing both single beam and swath bathymetry survey methods together and referencing both types of measurements to GPS rather than water level. Therefore, this survey is considered a seafloor-elevation survey and is explained in greater detail within this report. To accommodate coverage of this area in a limited timeframe, this seafloor-elevation survey was conducted using three techniques; single-beam bathymetry, interferometric swath bathymetry, and a walking kinematic survey of the island shorelines. All three techniques utilized GPS measurements. Implementation of these techniques was executed concurrently yet independently aboard two research vessels: the RV Survey Cat, a 26-foot (ft) shallow draft Glacier Bay Coastal Runner, and the 50-ft RV G.K. Gilbert. A portable push buggy with a rigid antenna-mount served as the platform for the kinematic shoreline survey. Data from each survey technique was post-processed and edited independently with proper inclusion of the differentially processed external navigation files. The x,y,z components from each method were then combined and the two survey years (2008 and 2009) were merged into one dataset. Chirp seismic data were also collected during these surveys and are archived separately.
Currentness_Reference: data collection interval
Maintenance_and_Update_Frequency: None planned
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: HYPACK Inc.
Theme_Keyword: single-beam bathymetry
Theme_Keyword: single beam
Theme_Keyword: swath bathymetry
Theme_Keyword: interferometric swath bathymetry
Theme_Keyword: Base Station
Theme_Keyword: Fort Massachusetts
Theme_Keyword: Continuously Operating Reference Station (CORS)
U.S. Geological Survey (USGS), St. Petersburg Coastal and Marine Science Center
Theme_Keyword: Gulf Islands National Seashore (GUIS)
Theme_Keyword: SEA Ltd.
Theme_Keyword: Systems Engineering and Assessment
Theme_Keyword: SWATHplus interferometric
Theme_Keyword: SWATHplus Interferometric Swath System
Theme_Keyword: SWATHplus -H 468-kHz Interferometric system
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: bathymetry and elevation
Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Keywords
Theme_Keyword: marine geophysics
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: multibeam sonar
Theme_Keyword: bathymetry measurement
Theme_Keyword: marine geophysics
Place_Keyword: West Ship Island
Place_Keyword: East Ship Island
Place_Keyword: Horn Island
Place_Keyword: Horn Island Pass
Place_Keyword: Camille Cut
Place_Keyword: Dog Keys
Place_Keyword: Dog Keys Pass
Place_Keyword: Petit Bois Island
Place_Keyword: Petit Bois Pass
Place_Keyword: Little Dog Keys Pass
Temporal_Keyword: July 2008
Temporal_Keyword: June 2009
The U.S. Geological Survey requests that it be referenced as the originator of this dataset in any future products or research derived from these data.
Use_Constraints: These data are not to be used for navigation.
Contact_Person: Nancy T. DeWitt
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
Address_Type: mailing and physical address
Contact_Voice_Telephone: (727) 803-8747 x3058
Address: 600 4th Street South
City: St. Petersburg
Nancy T. DeWitt, James G. Flocks, Elizabeth A. Pendleton, Mark E. Hansen, B.J. Reynolds, Kyle W. Kelso, Dana S. Wiese, and Charles R. Worley.
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 188.8.131.5200