MGL1109backsgeo.sd: Multibeam backscatter data collected by the U.S. Geological Survey in the Gulf of Alaska in 2011 during cruise MGL1109, 100-meter gridded data in Fledermaus digital terrain format, geographic coordinate system

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Metadata:

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:
MGL1109backsgeo.sd: Multibeam backscatter data collected by the U.S. Geological Survey in the Gulf of Alaska in 2011 during cruise MGL1109, 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: 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 69,060 square kilometers of Simrad EM122 multibeam-backscatter data collected in the Gulf of Alaska during U.S. Geological Survey (USGS) cruise MGL1109 aboard the R/V Marcus G. Langseth. The data have been reduced for position, elevation, orientation, water-column sound-speed, and refraction effects.
Purpose:
In June 2011, the U.S. Geological Survey (USGS) conducted a research cruise in the Gulf of Alaska 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 activities from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=L0911GA https://cmgds.marine.usgs.gov/fan_info.php?fan=2011-034-FA
Additional information about the Lamont-Doherty field activities from which these data were derived is available online at:
https://www.rvdata.us/search/cruise/MGL1108 https://www.rvdata.us/search/cruise/MGL1109
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: 20110603
Ending_Date: 20110625
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -152.381751
East_Bounding_Coordinate: -137.797038
North_Bounding_Coordinate: 57.713119
South_Bounding_Coordinate: 48.268275
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: 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:560ef883e4b0ba4884c5ed22
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Gulf of Alaska
Place_Keyword: Bering Sea
Place_Keyword: Kodiak Island
Place_Keyword: Dutch Harbor
Place:
Place_Keyword_Thesaurus: NGA GEOnet Names Server (GNS)
Place_Keyword: Baranof Fan
Place_Keyword: Shirshov Ridge
Place_Keyword: Kodiak Seamount
Place_Keyword: Bowie Seamount
Place_Keyword: Aleutian Trench
Place_Keyword: Umnak Plateau
Place_Keyword: Aleutian Basin
Place_Keyword: Bowers Ridge
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Surveyor Fan
Place_Keyword: Extended Continental Shelf
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: Browse_Graphic_File_Description: MGL1109 acoustic backscatter, Gulf of Alaska
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 50 and 6000 m. Depth accuracies not determined, however Kongsberg-Simrad state that the system is capable of depth accuracies approaching 0.2 percent of water depth.
Logical_Consistency_Report: No formal logical accuracy tests were conducted
Completeness_Report:
Raw EM122 Multibeam Echosounder data collected during OBS operations 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: 201106
Process_Step:
Process_Description:
EM122 backscatter was processed and mosaicked using the FMGeocoder module in IVS Fledermaus. The Automatic Processing option (Mosaic only) was utilized with the EM122 Beam Time Series (from *.all raw files) selected as the backscatter source. A single tile mosaic, with 100 m per pixel resolution, was created for the entire survey area. The final mosaic was exported to these file formats: Fledermaus SD, ESRI ASCII Raster, and XYB format (Easting, Northing, dB value).
The following project setup and processing parameters were specified: Project Coordinate System: Horiz. CS: WGS84,UTM,Zone 6N Custom Survey Area: XMIN,YMIN,XMAX,YMAX = 169100, 5385700, 1181500, 6408000 EM122 Sensor Config: Tx1:Xoff,Yoff,Zoff,Roff,Poff,Yoff = 20.92,0.57,8.46,0.16,-0.08,359.99 Tx2:Xoff,Yoff,Zoff,Roff,Poff,Yoff = 16.07,0.05,8.53,0.16,-0.08,0 IMU:Xoff,Yoff,Zoff,Roff,Poff,Yoff,lat = 0,0,0,-0.51,-0.23,0.43,0 Line Processing Parameters: Backscatter: Apply Beam Pattern Correction Beam Angle Cutoffs: start,cut = 0, 90 Backscatter Range: Calibrated,Min,Max = -70,10 AVG: Apply AVG - Flat Algorithm - Window Size 30 Statistics: Log space (dB) Navigation: Linear Interp. Format: Kongsberg(.all) Navigation Src.: Use Default Dual Swath Comp.: First O Sonar Defaults: Default Vals - Custom Override All - Sonar Type: Simrad EM122 MBES PrimFrq,SecFrq,MAN,MNB,ATBW,CTBW,SSS = 12000,0,120,484,2,4,1500 PusleL,PSR,SSR,Spread,TxPwr,RecGain,Abs = 5000,1001,0,0,1,1,30 Mosaicking Parameters: Line Blending = 50 percent Style, FiltType = Blend,dB Mean
Process_Date: 201208
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Wayne E. 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: Wrote version 1 of metadata.
Process_Date: 20121018
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Wayne E. 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:
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: 9559
Column_Count: 16898
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: 298.257223563
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: -59.610
Range_Domain_Maximum: 7.790
Attribute_Units_of_Measure: decibel
Overview_Description:
Entity_and_Attribute_Overview:

 Cell Size =             0.001 degree
 Data Type:            Floating Point
 Number of Rows    =       9559
 Number of Columns =       16898

 BOUNDARY (WGS84, excluding NODATA):
 Xmin = -152.382
 Xmax = -137.797
 Ymin =  48.268
 Ymax = 57.713

 BOUNDARY (converted from UTM zone 6 coordinates)
 Xmin = -152.555
 Xmax = -135.657
 Ymin =  48.256
 Ymax = 57.815

 STATISTICS (decibels)

 Minimum Value =            -59.610
 Maximum Value =              7.790
 Mean          =            -27.752
 Standard Deviation =         2.751

 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:
Zip file contains the grid of backscatter as well as the associated metadata file.
Transfer_Size: 212
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: 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

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