Multibeam acoustic-backscatter data collected in 2017 and 2018 of Noyes Submarine Canyon and vicinity, southeast Alaska

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Peter Dartnell
Originator: Daniel S. Brothers
Originator: Brian D. Andrews
Publication_Date: 20220919
Title:
Multibeam acoustic-backscatter data collected in 2017 and 2018 of Noyes Submarine Canyon and vicinity, southeast Alaska
Geospatial_Data_Presentation_Form: GeoTIFF
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9AU5I03
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/P9AU5I03
Online_Linkage: Larger_Work_Citation:
Citation_Information:
Originator: Peter Dartnell
Originator: Daniel S. Brothers
Originator: Brian D. Andrews
Publication_Date: 2022
Title:
Multibeam bathymetry and acoustic-backscatter data collected in 2017 and 2018 of Noyes Submarine Canyon and vicinity, southeast Alaska
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9AU5I03
Publication_Information:
Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/P9AU5I03
Online_Linkage:
Description:
Abstract:
These metadata describe acoustic-backscatter data collected during 2017 and 2018 multibeam echosounder surveys of Noyes Submarine Canyon and vicinity, southeast Alaska. Data were collected by the National Oceanic and Atmospheric Administration (NOAA) aboard the NOAA survey vessel Fairweather and the data were post-processed by the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC) for PCMSC research projects. The acoustic-backscatter data are provided as a GeoTIFF image.
Purpose:
In 2017 and 2018 the NOAA survey vessel Fairweather collected bathymetry and acoustic-backscatter data in and around Noyes Submarine Canyon in southeast Alaska using a Kongsberg EM-710 multibeam echosounder (NOAA survey D00208, https://www.ngdc.noaa.gov/nos/D00001-D02000/D00208.html and NOAA survey D00245, https://www.ngdc.noaa.gov/nos/D00001-D02000/D00245.html). These surveys were conducted to map the offshore expression of the Queen Charlotte-Fairweather fault system that runs for approximately 500 kilometers off the coast of southeast Alaska and British Columbia. These were part of a series of surveys to map the entire offshore component of the fault. The fault system has generated numerous powerful earthquakes in the magnitude 7 and 8 range. This new mapping will help understand the fault's slip rate, earthquake recurrence intervals, and paleoseismic history. The data provided in this data release were processed by PCMSC for these research studies. These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems or other software to identify bathymetric features. These data are not intended to be used for navigation.
Supplemental_Information:
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: 20170617
Ending_Date: 20180629
Currentness_Reference: ground condition at time data were collected.
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -134.82
East_Bounding_Coordinate: -133.76
North_Bounding_Coordinate: 55.30
South_Bounding_Coordinate: 54.25
Keywords:
Theme:
Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD)
Theme_Keyword: Bathymetry
Theme_Keyword: Seafloor Topography
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: sea-floor characteristics
Theme_Keyword: sea-floor acoustic reflectivity
Theme_Keyword: geospatial datasets
Theme_Keyword: marine geophysics
Theme_Keyword: multibeam sonar
Theme_Keyword: image mosaics
Theme:
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: Distributions
Theme:
Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: seabed
Theme_Keyword: field observation
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:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:5cef0730e4b0fd6593c49dcd
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: State of Alaska
Place_Keyword: Noyes Canyon
Place_Keyword: Dixon Entrance
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 and the National Oceanic and Atmospheric Administration as the originators 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:
Quick view image of 2017-2018 Noyes submarine canyon acoustic-backscatter data
Browse_Graphic_File_Type: JPEG
Native_Data_Set_Environment:
Caris HIPS and SIPS (ver. 11) and ArcMap (ver. 10.3.1) on a Windows 7 computer.
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: Not applicable for raster data.
Logical_Consistency_Report: No formal logical accuracy tests were conducted.
Completeness_Report:
Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The NOAA survey vessel Fairweather was outfitted with an Applanix POS-MV position and motion compensation system. This system has post-processed horizontal positional accuracy of about 0.1 m and roll and pitch accuracies of about 0.02 degrees (https://www.applanix.com/downloads/products/specs/posmv/POS-MV-WaveMaster-II.pdf). Accuracies of final products may be lower due to water depth and total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: Not applicable to acoustic-backscatter data
Lineage:
Process_Step:
Process_Description:
In 2017 and 2018 the NOAA survey vessel Fairweather mapped in and around Noyes Submarine Canyon in southeast Alaska using a Kongsberg EM-710 multibeam echosounder. USGS, PCMSC processed the bathymetry and acoustic-backscatter data post-cruise. The survey line files were imported into Caris HIPS and SIPS software (version 11) for processing. Post-processed Applanix POS-MV attitude data (SBET) were merged with each line file. Water column sound velocity data that was collected throughout the surveys was applied to the bathymetry data. The data were cleaned of obvious bad soundings and the soundings were gridded into 30-m surfaces. Acoustic-backscatter data were processed using the Beam Average engine, applying Time Varying Gain and moderate despeckling. The backscatter mosaics were exported as geoTIFF images in UTM, zone 8, WGS84 coordinates and imported into a Geographic Information System (GIS). The mosaics were then merged together using the "Mosaic to New Raster" command and exported as a TIFF image in UTM, zone 8, WGS84 coordinates.
Process_Date: 2018
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 4003
Column_Count: 2446
Vertical_Count: 1
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 8
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -135.00000
Latitude_of_Projection_Origin: 0.00000
False_Easting: 500000.0
False_Northing: 0.00
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 30.0
Ordinate_Resolution: 30.0
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: WGS84
Ellipsoid_Name: WGS84
Semi-major_Axis: 6378137.00
Denominator_of_Flattening_Ratio: 298.257223563
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: value
Entity_Type_Definition: acoustic-backscatter value
Entity_Type_Definition_Source: Producer defined
Overview_Description:
Entity_and_Attribute_Overview:
The complete 30-m resolution "NoyesCyn_2017_2018_30m_backscatter_UTM08_WGS84" mosaic was originally archived as a GeoTIFF image with the following attributes.
Cell size = 30.0
Number of rows = 4003
Number of columns = 2446

Data type = floating point

Boundary
Xmin = 506385
Xmax = 579765
Ymin = 6009885
Ymax = 6129975

Statistics
Minimum value = -251.98
Maximum value = 155.34
Mean = -17.31
Standard deviation = 9.75

Coordinate system description
Projection  UTM
Zone  8
Datum  WGS84
Units  meter
Entity_and_Attribute_Detail_Citation: U.S. Geological Survey
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 GeoTIFF format, along with a tif world file (.tfw) and 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: GeoTIFF
Format_Version_Number: ArcMap (version 10.3.1)
Format_Information_Content:
Downloadable zip file contains the GeoTIFF (.tif), and the projection file (.tfw.
File_Decompression_Technique: WinZip
Transfer_Size: 10
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: Access_Instructions:
Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download a zipped file of the backscatter data. The second link points to a landing page with the data, metadata, and browse image. The third link points to the landing page for the entire data release, including links to pages of the various data files.
Fees: None.
Technical_Prerequisites:
The downloadable data file has been compressed with the "zip" command and can be unzipped with Winzip (or other tool) on Windows systems. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing a GeoTIFF file.
Metadata_Reference_Information:
Metadata_Date: 20220919
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_P9AU5I03/NoyesCyn_2017_2018_30m_backscatter_UTM08_WGS84_metadata.html>
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