Originator: U.S. Geological Survey
Interferometric Swath Bathymetric Data Collected in 2012 from the Chandeleur Islands, Louisiana (U.S. Geological Survey Field Activity Number 12BIM03)
Originator: Nancy T. DeWitt
Originator: Julie C. Bernier
Originator: William R. Pfeiffer
Originator: Jennifer L. Miselis
Originator: James G. Flocks
Originator: B.J. Reynolds
Originator: Dana S. Wiese
Originator: Kyle W. Kelso
Coastal Bathymetry and Backscatter Data Collected in 2012 from the Chandeleur Islands, Louisiana
Geospatial_Data_Presentation_Form: multimedia presentation
Series_Name: U.S. Geological Survey Data Series
Publication_Place: St. Petersburg, Florida
Publisher: U.S. Geological Survey
As part of the Barrier Island Evolution Research Project, scientists from the U.S. Geological Survey's St. Petersburg Coastal and Marine Science Center conducted nearshore geophysical surveys off the northern Chandeleur Islands, Louisiana, in July of 2012. The overall objective of the study is to better understand barrier-island geomorphic evolution, particularly storm-related depositional and erosional processes that shape the islands over annual to interannual timescales (1-5 years). The collection of geophysical data will allow us to identify relationships between the geologic history of the island and its present day morphology and sediment distribution. This mapping effort was the first in a series of three planned surveys in this area. High resolution geophysical data collected in each of 3 consecutive years along this rapidly changing barrier-island system will provide a unique time-series dataset that will significantly further the analyses and geomorphological interpretations of this and other coastal systems, improving our understanding of coastal response and evolution over short time scales (1-5 years).
This report serves as an archive of processed interferometric swath and single-beam bathymetry data that were collected during two cruises (USGS Field Activity Numbers 12BIM03 and 12BIM04) along the northern portion of the Chandeleur Islands, Breton National Wildlife Refuge, Louisiana in July of 2012. Geographic information system data products include a 50 m-cell-size interpolated bathymetry grid surface, trackline maps, and point data files. Additional files include error analysis maps, Field Activity Collection System logs, and formal Federal Geographic Data Committee metadata.
This zip archive contains processed x,y,z data points for the interferometric swath bathymetry data collected around Chandeleur Islands, La. in July 2012. The processed swath data are provided as ASCII x,y,z point data file. These values are not the individual soundings but are the exported BASE (Bathymetry with Associated Statistical Error) surface at 5 meter spatial distances with associated CUBE surface (Combined Uncertainty and Bathymetry Estimator) sample surface created from the edited soundings dataset. These are considered interpolated samples in which one value represents all soundings within a five meter node, weighted by uncertainty and proximity, giving the final value as a data sample within the specific grid cell. No human editing has been applied: no erroneous point removal, interpretation, or validation has been done beyond this point.
The swath bathymetry data were collected and processed in the ITRF2005 geodetic reference ellipsoid whereas the single-beam data were collected and processed in WGS84 (G1150)/ITRF00. Both datasets were subsequently transformed horizontally to NAD83 and then vertically to NAVD88 and MLLW, using the GEOID09 model with National Oceanic and Atmospheric Administration (NOAA) VDatum version 3.2 transformation software (http://vdatum.noaa.gov/)
. The final NAD83, NAVD88 x,y,z position data from each survey were merged to generate a digital elevation model with a cell-size resolution of 50 meters.
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: marine geology
Theme_Keyword: Systems Engineering and Assessment
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: St. Petersburg Coastal and Marine Science Center
Theme_Keyword: Barrier Island Evolution Research Project
Theme_Keyword: Barrier Island Mapping
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Gulf of Mexico
Place_Keyword: Chandeleur Islands
Place_Keyword: Chandeleur Sound
Temporal_Keyword: July 2012
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.
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. These data should not be used for navigational purposes.
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) 502-8000
Address: 600 4th Street South
City: St. Petersburg
U.S. Geological Survey, Coastal and Marine Geology Program, St. Petersburg Coastal and Marine Science Center
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