Multibeam bathymetry data collected in 2015 near Cross Sound, southeast Alaska, during field activity 2015-629-FA

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Peter Dartnell
Originator: Daniel S. Brothers
Originator: Peter J. Haeussler
Publication_Date: 20220919
Title:
Multibeam bathymetry data collected in 2015 near Cross Sound, southeast Alaska, during field activity 2015-629-FA
Geospatial_Data_Presentation_Form: GeoTIFF
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/F7JH3KG6
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/F7JH3KG6
Online_Linkage: Larger_Work_Citation:
Citation_Information:
Originator: Peter Dartnell
Originator: Daniel S. Brothers
Originator: Peter J. Haeussler
Publication_Date: 2022
Title:
Multibeam bathymetry and acoustic-backscatter data collected in 2015 near Cross Sound, southeast Alaska, during field activity 2015-629-FA
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/F7JH3KG6
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/F7JH3KG6
Online_Linkage:
Description:
Abstract:
These metadata describe bathymetry collected during a 2015 multibeam echosounder survey near Cross Sound, southeast Alaska. Data were collected by the U.S. Geological Survey (USGS) and the Alaska Department of Fish and Game (ADFG) aboard the ADFG R/V Solstice during USGS field activity 2015-629-FA. The bathymetry data are published here as a 32-bit GeoTIFF image.
Purpose:
These metadata describe the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC) 2015 bathymetry data collected near Cross Sound, southeast Alaska that is provided as a 10-m resolution TIFF image. In 2015 the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC)in cooperation with the Alaska Department of Fish and Game (ADFG) collected bathymetry and acoustic backscatter data near Cross Sound in southeast Alaska using an Reson 7111 multibeam echosounder mounded to the ADFG R/V Solstice. The survey was conducted to map the offshore expression of the Queen Charlotte fault system that runs for approximately 500 kilometers off the coast of southeast Alaska and British Columbia. This was the first in 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. 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:
Additional information about the field activities from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2015-629-FA
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: 20150505
Ending_Date: 20150521
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: -137.202
East_Bounding_Coordinate: -136.217
North_Bounding_Coordinate: 58.426
South_Bounding_Coordinate: 57.808
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: bathymetry
Theme_Keyword: bathymetry measurement
Theme_Keyword: sea-floor characteristics
Theme_Keyword: geospatial datasets
Theme_Keyword: marine geophysics
Theme_Keyword: multibeam sonar
Theme:
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: Bathymetry and Elevation
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:5abc0e9ce4b081f61abd5c61
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: State of Alaska
Place_Keyword: Cross Sound
Place_Keyword: Queen Charlotte Fault
Place_Keyword: Icy Point
Place_Keyword: Lisianski Inlet
Place_Keyword: Graves Harbor
Place_Keyword: Yakobi Sea Valley
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 Alaska Department of Fish and Game 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 2015 Cross Sound shaded-relief bathymetry data
Browse_Graphic_File_Type: JPEG
Native_Data_Set_Environment:
Caris HIPS and SIPS (ver. 9) 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:
A couple of transit or test lines that are in the tracklines shapefile are not included in the bathymetry grid. 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 Coda Octopus F180 position and motion compensation system has a horizontal positional accuracy of about 0.4 m with DGPS correstions and roll and pitch accuracies of about 0.025 degrees (https://www.oceanscan.net/gallery/Data_Sheets/CODA_F180_PRECISION_ALTITUDE__POSITIONING_SYSTEMS.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:
The Coda Octopus F180 position and motion compensation system has heave accuracy between 3.5cm - 5cm (https://www.oceanscan.net/gallery/Data_Sheets/CODA_F180_PRECISION_ALTITUDE__POSITIONING_SYSTEMS.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.
Lineage:
Process_Step:
Process_Description:
In May 2015 the USGS, PCMSC mapped offshore Cross Sound in southeast Alaska over the northern section of the Queen Charlotte fault. A Reson 7111 multibeam echosounder was pole-mounted to the Alaska Department of Fish and Game R/V Solstice. The survey line files were imported into Caris HIPS and SIPS software (version 9) for bathymetric processing. Water column sound velocity data that was collected throughout the survey was applied to the bathymetry data and verified tides from the Elfin Cove tide station (9452634) were applied in post-processing. The data were cleaned of obvious bad soundings and the soundings were gridded into a 10-m surface. The surface was exported as an ASCIIRaster file and imported into a Geographic Information System (GIS). The bathymetry grid was transformed to UTM zone 8, WGS84 coordinates, vertically referenced to the WGS84 ellipsoid using datum offset values from NOAA's VDatum tool, https://vdatum.noaa.gov/welcome.html. A value of 0.12m was added to the MLLW grid to transform to NAVD88 and then a value of 3.1m was added to transform to WGS84. The bathymetry grid was then exported as a GeoTIFF file in UTM zone 8, WGS84 coordinates, vertically reference to the WGS84 ellipsoid (CrossSound_2015_bathy_10m_UTM08_WGS84_WGS84.tif).
Process_Date: 2020
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 6746
Column_Count: 5632
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: row and column
Coordinate_Representation:
Abscissa_Resolution: 10.0
Ordinate_Resolution: 10.0
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: WGS84
Ellipsoid_Name: WGS84
Semi-major_Axis: 6378137.00
Denominator_of_Flattening_Ratio: 298.257223563
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: World Geodetic Datum 1984
Altitude_Resolution: 0.1
Altitude_Distance_Units: meters
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: value
Entity_Type_Definition: depth in meters relative to the WGS84 ellipsoid
Entity_Type_Definition_Source: Producer defined
Overview_Description:
Entity_and_Attribute_Overview:
The complete 10-m resolution 2015 Cross Sound bathymetry grid was originally archived as a TIFF image with the following attributes.
Cell size = 10.0
Number of rows = 6746
Number of columns = 5632

Data type = floating point

Boundary
Xmin = 371385
Xmax = 427705
Ymin = 6409385
Ymax = 6476845

Statistics
Minimum value = -427.54
Maximum value = -6.74
Mean = -190.72
Standard deviation = 91.60

Coordinate system description
Projection  UTM
Zone  8
Datum  WGS84
Vertical Reference 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, including 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 TIFF (.tif) and the projection file (.tfw).
File_Decompression_Technique: WinZip
Transfer_Size: 17
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 the zipped file of the bathymetry data. The second link points to a landing page with data, metadata, and a 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_F7JH3KG6/CrossSound_2015_bathy_10m_UTM08_WGS84_WGS84_metadata.html>
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