MGL1111backsgeo.sd: Multibeam backscatter data collected by the U.S. Geological Survey in the Bering Sea in 2011 during cruise MGL1111, 100-meter gridded data in Fledermaus digital terrain format, geographic coordinate system

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Identification_Information:

Citation:

Citation_Information:

Originator: Ginger Barth
Originator: Wayne E. Baldwin
Originator: Robert S. Reece
Originator: Sean S. Gulick
Originator: William W. Danforth
Originator: Florence L. Wong
Publication_Date: 20220825
Title:

MGL1111backsgeo.sd: Multibeam backscatter data collected by the U.S. Geological Survey in the Bering Sea in 2011 during cruise MGL1111, 100-meter gridded data in Fledermaus digital terrain format, geographic coordinate system

Geospatial_Data_Presentation_Form: raster digital data
Series_Information:

Series_Name: data release
Issue_Identification: DOI: 10.5066/F7HM56HK

Publication_Information:

Publication_Place:

Pacific Coastal and Marine Science Center, Santa Cruz, California

Publisher: U.S. Geological Survey

Online_Linkage: https://doi.org/10.5066/F7HM56HK
Online_Linkage:

https://www.sciencebase.gov/catalog/item/568c3148e4b0e7594ee77897

Larger_Work_Citation:

Citation_Information:

Originator: Ginger Barth
Originator: Wayne E. Baldwin
Originator: Robert S. Reece
Originator: Sean S. Gulick
Originator: William W. Danforth
Originator: Florence L. Wong
Publication_Date: 2022
Title:

Multibeam bathymetry and acoustic backscatter data from the Alaskan region, Extended Continental Shelf Project, 2011 field season: Gulf of Alaska and Bering Sea

Series_Information:

Series_Name: data release
Issue_Identification: DOI: 10.5066/F7HM56HK

Publication_Information:

Publication_Place:

Pacific Coastal and Marine Science Center, Santa Cruz, California

Publisher: U.S. Geological Survey

Online_Linkage: https://doi.org/10.5066/F7HM56HK

Description:

Abstract:

This raster dataset represents approximately 49,581 square kilometers of Simrad EM122 multibeam backscatter-intensity data collected in the Bering Sea during U.S. Geological Survey (USGS) cruise MGL1111 aboard the R/V Marcus G. Langseth. Calibrated backscatter-intensity time-series data were adjusted for range-angle, beam pattern, and power-gain distortions.

Purpose:

In August 2011, the U.S. Geological Survey (USGS) conducted a research cruise in the Bering Sea aboard the R/V Marcus G. Langseth (Lamont-Doherty Earth Observatory, Columbia University) as part of the U.S. Extended Continental Shelf Project. The mission focused primarily on obtaining geophysical data (multichannel and CHIRP seismic reflection, ocean bottom seismometry, multibeam bathymetry, sonobuoy, XBT and XCTD) for the purposes of determining geologic framework, crustal nature, and sediment thickness in support of delineating the U.S. Extended Continental Shelf under provisions contained in Article 76 of the United Nations Convention on the Law of the Sea (UNCLOS).

Supplemental_Information:

Additional information about the USGS field activity from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=L1111BS
Additional information about the Lamont-Doherty field activity from which these data were derived is available online at:
https://www.rvdata.us/search/cruise/MGL1111
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20110810
Ending_Date: 20110902

Currentness_Reference: ground condition

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: 174.007728
East_Bounding_Coordinate: -166.506780
North_Bounding_Coordinate: 58.881900
South_Bounding_Coordinate: 53.979347

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: environment
Theme_Keyword: geoscientificInformation
Theme_Keyword: oceans

Theme:

Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: Substrate
Theme_Keyword: Physical Habitats and Geomorphology

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: sea-floor characteristics
Theme_Keyword: multibeam sonar
Theme_Keyword: marine geophysics
Theme_Keyword: sea-floor acoustic reflectivity
Theme_Keyword: image mosaics
Theme_Keyword: geospatial datasets

Theme:

Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: marine geophysics
Theme_Keyword: seismic methods
Theme_Keyword: multibeam echo sounder
Theme_Keyword: continental shelf

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Hazards and Resources Program
Theme_Keyword: CMHRP
Theme_Keyword: Pacific Coastal and Marine Science Center
Theme_Keyword: PCMSC
Theme_Keyword: backscatter intensity

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:568c3148e4b0e7594ee77897

Place:

Place_Keyword_Thesaurus: Geographic Names Information Service
Place_Keyword: Dutch Harbor

Access_Constraints: None
Use_Constraints:

USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator of the dataset and in products derived from these data. This information is not intended for navigation purposes.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

U.S. Geological Survey, Pacific Coastal and Marine Science Center

Contact_Person: PCMSC Science Data Coordinator

Contact_Address:

Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060

Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov

Browse_Graphic:

Browse_Graphic_File_Name:

https://www.sciencebase.gov/catalog/file/get/568c3148e4b0e7594ee77897?name=MGL1111backscat.jpg&allowOpen=true

Browse_Graphic_File_Description: MGL1111 acoustic backscatter, Bering Sea
Browse_Graphic_File_Type: JPEG

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850

Cross_Reference:

Citation_Information:

Originator: David W. Caress
Originator: Dale N. Chayes
Publication_Date: 2006
Title: MB-System source code
Online_Linkage: https://www3.mbari.org/data/mbsystem/html/mbsystem_home.html

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Kongsberg-Simrad EM122 Multibeam Echosounder was used with transmit (fore-aft) and receive (athwart ships) beam widths of 1 degree, with swaths of 3-4 times water depth in water depths between 80 and 3900 m. The EM122 is a calibrated system that logs backscatter sound levels in decibels (dB).

Logical_Consistency_Report: No formal logical accuracy tests were conducted
Completeness_Report:

Raw EM122 Multibeam Echosounder data collected during OBS operations (portions of Julian Days 233-240) were not used in the generation of this gridded dataset because OBS instruments were deployed along transects coincident with previously surveyed ship track. Upon inspection in CARIS during post-processing it was deemed appropriate to exclude the redundant data from the gridding process.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Horizontal positioning of the vessel was determined using a Kongsberg Seapath 300 series integrated inertial motion and positioning system. Positioning is accurate to better than 5 meters (at 95 percent confidence) during all surveying. All positioning is referenced to the WGS84 Datum.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

No attempt was made to determine the accuracy of the system although recorded depths are typically within +/-10 m of the center-beam multibeam sounding.

Lineage:

Process_Step:

Process_Description:

Multibeam bathymetry and backscatter data were collected using a 12 kHz Kongsberg Simrad EM-122 multibeam echosounder and SIS (v3.8.2) acquisition software. The system consists of two hull-mounted transducer arrays, a transmit unit (150 deg. x 1 deg.) located along the ship centerline, and a receive unit (1 deg. x 30 deg.) that is abaft and oriented athwart-ships. The transducer pod is tilted 4 degrees towards the bow to reduce noise from cavitation and bubbles. The system forms a swath of 288 beams that produce an across-track profile of 432 soundings. The SIS software processes range/angle data from each ping during acquisition, merging position, inertial-motion, and sound-velocity data to derive a solution for vessel motion and raybending, and calculate sounding depths and positions. Sound velocity information entered into SIS was obtained from the Applied Micro Systems Micro SV mounted on the transducer pod and 52 XBT profiles. XBT profiles were extended to 12 km depth with data generated by the unix program 'mblevitus', a module of the multibeam processing package MB-System (Caress and Chayes, 2006). Average water column salinity of 34.4 ppt was determined by extrapolating data from XCDT casts. Multibeam data were collected nearly continuously throughout the cruise, effectively mapping the seafloor along the course of the ship's track. Beam angle was set at 70 on each side throughout the program and swath widths were generally between 3 and 4 times water depth. SIS logged bathymetry and backscatter solutions to the Simrad '.all' format for archival purposes.

Process_Date: 201108

Process_Step:

Process_Description:

IVS3D Fledermaus FMGeocoder Toolbox (FMGT) processing for MGL1111: A new FMGT project (ver. 7.1) was created with projection information set to Universal Transverse Mercator (UTM) Zone 60N, WGS84. The Automatic Processing option (Mosaic only) was utilized with the EM122 Beam Time Series (from *.all raw files) selected as the backscatter source. Processing of the backscatter-intensity data included the application of angle-varrying-gain and beam-pattern functions, as well as histogram modifications to account for power and gain changes applied during acquisition. A single tile mosaic, with 100 m per pixel resolution, was created for the entire survey area. The final mosaic was exported to Fledermaus SD, GEOTIFF, ArcGIS ASCII grid, and XYdB formats.

Process_Date: 201108
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: Wayne Baldwin

Contact_Position: Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA

Contact_Voice_Telephone: 508-457-2226
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov

Process_Step:

Process_Description:

The output ESRI ASCII Raster file was imported as a floating point grid into ArcGIS 9.3 using the ASCII to Raster tool selected from the Conversion Tools - To Raster toolbox.

Process_Date: 201205
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: Wayne Baldwin

Contact_Position: Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA

Contact_Voice_Telephone: 508-457-2226
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov

Process_Step:

Process_Description: Wrote version 1 of metadata.
Process_Date: 20121018
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: Wayne Baldwin

Contact_Position: Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA

Contact_Voice_Telephone: 508-457-2226
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: wbaldwin@usgs.gov

Process_Step:

Process_Description:

Metadata was modified to bring up to current USGS PCMSC standards. Point of Contact and Metadata Contact information was updated. Keywords were added and refined. Cross Reference citation added. Details about different Network Resource Name links was given in the Access Instructions section. Minor typos were corrected. No data information was changed.

Process_Date: 20220817
Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Susan A Cochran
Contact_Organization:

U.S. Geological Survey, Pacific Coastal and Marine Science Center

Contact_Position: Geologist
Contact_Address:

Address_Type: mailing and physical
Address: 2885 Mission St.
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: United States

Contact_Voice_Telephone: 831-460-7545
Contact_Electronic_Mail_Address: scochran@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:

Raster_Object_Type: Grid Cell
Row_Count: 4027
Column_Count: 17578
Vertical_Count: 1

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.001
Longitude_Resolution: 0.001
Geographic_Coordinate_Units: decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: D_WGS_84
Ellipsoid_Name: WGS_84
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257223563000030000

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Attribute Table
Entity_Type_Definition:

Table containing attribute information associated with the data set.

Entity_Type_Definition_Source: Producer defined

Attribute:

Attribute_Label: Value
Attribute_Definition: backscatter intensity
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -55.200
Range_Domain_Maximum: 9.680
Attribute_Units_of_Measure: decibel

Overview_Description:

Entity_and_Attribute_Overview:


 Cell Size =             0.001 degree
 Data Type:            Floating Point
 Number of Rows    =       4027
 Number of Columns =       17578

 BOUNDARY (coordinates excluding nodata)

 Xmin = 174.008
 Xmax = -166.507
 Ymax = 58.882
 Ymin = 53.979

 BOUNDARY (converted from UTM zone 60 coordinates)

 Xmin = 173.036
 Xmax = 195.156
 Ymin = 53.845
 Ymax = 58.913

 STATISTICS (decibels)

 Minimum Value =            -55.200
 Maximum Value =              9.680
 Mean          =            -24.736
 Standard Deviation =         2.518

 COORDINATE SYSTEM DESCRIPTION

 Projection           GEOGRAPHIC
 Datum                     WGS84
 Units                        DD
 Spheroid                  WGS84

Entity_and_Attribute_Detail_Citation:

The entity and attribute information was generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey - ScienceBase

Contact_Address:

Address_Type: mailing and physical
Address: Denver Federal Center, Building 810, Mail Stop 302
City: Denver
State_or_Province: CO
Postal_Code: 80225

Contact_Voice_Telephone: 1-888-275-8747
Contact_Electronic_Mail_Address: sciencebase@usgs.gov

Resource_Description:

These data are available in Fledermaus digital terrain .sd format, along with CSDGM FGDC-compliant metadata.

Distribution_Liability:

Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: Fledermaus digital terrain
Format_Version_Number: 7
Format_Information_Content:

This WinZip (v.14) file contains the grid of backscatter as well as the associated metadata files.

Transfer_Size: 128

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://www.sciencebase.gov/catalog/file/get/568c3148e4b0e7594ee77897

Network_Resource_Name:

https://www.sciencebase.gov/catalog/item/568c3148e4b0e7594ee77897

Network_Resource_Name: https://doi.org/10.5066/F7HM56HK

Access_Instructions:

Data can be downloaded using the Network Resource Links. The first link is a direct link to download a zipped file with the data and metadata. The second link is to the page containing the data. The third link is to the publication landing page.

Fees: None

Metadata_Reference_Information:

Metadata_Date: 20220825
Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

U.S. Geological Survey, Pacific Coastal and Marine Science Center

Contact_Person: PCMSC Science Data Coordinator

Contact_Address:

Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060

Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov

Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_F7HM56HK/MGL1111backsgeo.sd.html>