Ginger Barth
Wayne Baldwin
Bobby Reece
Sean Gulick
William Danforth
Florence Wong
20220825
Multibeam bathymetry data collected by the U.S. Geological Survey in the Bering Sea in 2011 during cruise MGL1111, along-track center-beam depths extracted from 100-meter gridded data in plain text format, geographic coordinates.
tabular digital data
data release
DOI: 10.5066/F7HM56HK
Pacific Coastal and Marine Science Center, Santa Cruz, California
U.S. Geological Survey
https://doi.org/10.5066/F7HM56HK
https://www.sciencebase.gov/catalog/item/5723ae09e4b0b13d39148e17
Ginger Barth
Wayne E. Baldwin
Robert S. Reece
Sean S. Gulick
William W. Danforth
Florence L. Wong
2022
Multibeam bathymetry and acoustic backscatter data from the Alaskan region, Extended Continental Shelf Project, 2011 field season: Gulf of Alaska and Bering Sea
data release
DOI: 10.5066/F7HM56HK
Pacific Coastal and Marine Science Center, Santa Cruz, California
U.S. Geological Survey
https://doi.org/10.5066/F7HM56HK
This shapefile contains center-beam depths for approximately 5727 trackline kilometers of Simrad EM122 multibeam-bathymetry data collected in the Bering Sea during U.S. Geological Survey - Coastal and Marine Geology Program cruise MGL1111 aboard the R/V Marcus G. Langseth. The depth values were extracted from gridded data which were reduced for position, elevation, orientation, water-column sound-speed, and refraction effects.
In August 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).
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.
20110810
20110902
ground conditiion
None planned
174.120824
-166.493468
58.820824
53.995428
Data Categories for Marine Planning
Bathymetry and Elevation
Physical Habitats and Geomorphology
USGS Thesaurus
bathymetry
multibeam sonar
marine geophysics
geospatial datasets
Marine Realms Information Bank (MRIB) keywords
marine geophysics
multibeam echo sounder
continental shelf
None
U.S. Geological Survey
USGS
Coastal and Marine Hazards and Resources Program
CMHRP
Pacific Coastal and Marine Science Center
PCMSC
USGS Metadata Identifier
USGS:568c3b0ce4b0983143b62184
Geographic Names Information Service
Dutch Harbor, AK
None
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.
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
https://www.sciencebase.gov/catalog/file/get/568c3b0ce4b0983143b62184?name=MGL1111bathy.jpg&allowOpen=true
MGL1111 multibeam bathymetry, Bering Sea
JPEG
Environment as of Metadata Creation: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 10.2 (Build 3552) Service Pack [N/A] (Build [N/A])
David W. Caress
Dale N. Chayes
2006
MB-System source code
https://www3.mbari.org/data/mbsystem/html/mbsystem_home.html
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 60 and 3900 m. Depth accuracies not determined, however Kongsberg-Simrad state that the system is capable of depth accuracies approaching 0.2 percent of water depth.
No formal logical accuracy tests were conducted
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.
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.
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.
CARIS processing for MGL1111: A new CARIS HIPS project (ver. 7.1) was created with projection information set to Universal Transverse Mercator (UTM) Zone 60N, WGS84. Each Simrad EM122 data file (*.all) was imported to the new CARIS project using the Import/Conversion Wizard. A 100 meter resolution Bathymetric and Statistical Error (BASE) Surface was created and new files were added to the surface each Julian day. With the addition of new files, the BASE surface was reviewed for any inconsistencies
or data anomalies. Navigation was edited as needed using the navigation editor tool in CARIS. Filters were applied to each line including beam to beam slopes and across
track angle. The CARIS "surface filter" was applied to the data using the two standard deviation option. Swath data were also edited manually to remove obviously outlying soundings.
201108
U.S. Geological Survey
Wayne Baldwin
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
USA
(508) 457-2226
wbaldwin@usgs.gov
The 100 meter CARIS HIPS BASE surface for MGL1111 was exported from CARIS as a Bathymetric Attributed Grid (BAG) file. The resulting BAG file was used to import the surface into IVS3D DMagic as gridded data, then the surface was saved as a Fledermaus Digital Terrain Model in the IVS3D SD format. Finally, the Fledermaus
ArcGIS module was used to export the surface directly to an ESRI Binary Grid.
201203
U.S. Geological Survey
Wayne Baldwin
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543
USA
(508) 457-2226
(508) 457-2310
wbaldwin@usgs.gov
Navigation information (Easting,Northing,Longitude,Latitude,UTC Time,Year-Julian Day,SIS Filename) were extracted from the CARIS HIPS database utilizing a Perl script that ran the CARIS command 'printfnav' on all edited EM122 data files. Unix 'cat' was used to concatenate the output nav files to a single file, 'grep' was used to extract only soundings flagged as accepted, then an 'awk' filter was used to extract records with unique navigation fixes, one per second. The resultant text file was used to create an ArcGIS point feature class (ArcMap, create feature class from XY table).
201203
U.S. Geological Survey
Wayne Baldwin
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
USA
(508) 457-2226
wbaldwin@usgs.gov
The navigation text file created in the previous step was used to create an ArcGIS point feature class (ArcMap, create feature class from XY table). The navigation point feature class and the ESRI binary grid 'MGL1111_bathy' were used as the point and raster inputs for the ArcGIS Spatial Analyst tool 'Extract values to points', with the interpolate values at point locations option selected. The resultant point shapefile containing "Easting,Northing,Longitude,Latitude,UTC Time,Year-Julian Day,SIS Filename,Depth (meters)" was exported to ASCII text.
201203
U.S. Geological Survey
Wayne Baldwin
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
USA
(508) 457-2226
wbaldwin@usgs.gov
Wrote version 1 of metadata
201208
U.S. Geological Survey
Wayne Baldwin
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
USA
(508) 457-2226
wbaldwin@usgs.gov
The file was was re-sorted on the basis of columns JDYR and UTC to ensure chronological order.
201411
U.S. Geological Survey
Florence Wong
Geologist
mailing and physical address
345 Middlefield Road, MS 999
Menlo Park
CA
94025
USA
650-3290-5327
fwong@usgs.gov
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.
20230310
Susan A Cochran
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Geologist
mailing and physical
2885 Mission St.
Santa Cruz
CA
95060
United States
831-460-7545
scochran@usgs.gov
Point
point
1997841
0.0196893509
0.0324373614
Decimal seconds
D_WGS_1984
WGS_1984
6378137.0
298.257223563
Instantaneous sea level
10
meters
Explicit depth coordinate included with horizontal coordinates
Attribute Table
Table containing attribute information associated with the data set.
Producer defined
EAST
x-coordinate, UTM Zone 60N
Producer defined
321965.59
1577310.99
meters
NORTH
y-coordinate, UTM Zone 60N
Producer defined
6110039.99
6520446.1
meters
LON
longitude
Producer defined
-166.493468
174.120824
degrees
LAT
latitude
Producer defined
53.995428
58.820824
degrees
UTC
time UTC
Producer defined
Time formatted as HH:MM:SS, where HH = hour (0-23), MM = minute (0-59), SS = second to 3 decimal places (0-59.999).
YRJD
year and day of the year
Producer defined
Year and day of the year (1-365).
FILE
filename
Producer defined
swath filename
EM122depth
depth
Producer defined
-3855.52
-85.44
meters
sequence
sorted record sequence number
Producer defined
record number
The entity and attribute information provided here describes the tabular data associated with the data set. Please review the detailed descriptions that are provided (the individual attribute descriptions) for information on the values that appear as fields/table entries of the data set.
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.
U.S. Geological Survey - ScienceBase
mailing and physical
Denver Federal Center, Building 810, Mail Stop 302
Denver
CO
80225
1-888-275-8747
sciencebase@usgs.gov
These data are available in shapefile format, along with accessory files and CSDGM FGDC-compliant metadata.
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.
shapefile
101
https://www.sciencebase.gov/catalog/file/get/568c3b0ce4b0983143b62184
https://www.sciencebase.gov/catalog/item/568c3b0ce4b0983143b62184
https://doi.org/10.5066/F7HM56HK
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.
None
20230310
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998