Nearshore bathymetry data from the Elwha River delta, Washington, April 2014, collected from personal watercraft

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Andrew W. Stevens
Originator: Guy Gelfenbaum
Originator: Jonathan A. Warrick
Originator: Ian M. Miller
Originator: Heather M. Weiner
Publication_Date: 2017
Title:
Nearshore bathymetry data from the Elwha River delta, Washington, April 2014, collected from personal watercraft
Geospatial_Data_Presentation_Form: comma-delimited text
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/F76T0JSP
Publication_Information:
Publication_Place: Santa Cruz, CA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/F76T0JSP
Larger_Work_Citation:
Citation_Information:
Originator: Andrew W. Stevens
Originator: Guy Gelfenbaum
Originator: Jonathan A. Warrick
Originator: Ian M. Miller
Originator: Heather M. Weiner
Publication_Date: 2017
Title:
Bathymetry, topography, and sediment grain-size data from the Elwha River delta, Washington, April and May 2014
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/F76T0JSP
Publication_Information:
Publication_Place: Santa Cruz, CA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/F76T0JSP
Description:
Abstract:
This part of the data release presents bathymetry data from the Elwha River delta collected in April 2014 using two personal watercraft (PWCs). The PWCs were equipped with single-beam echosounders and survey-grade global navigation satellite system (GNSS) receivers.
Purpose:
Data were obtained to assess the coastal geomorphic response following the removal of two dams on the Elwha River. 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 topographic and shallow-water bathymetric features.
Supplemental_Information:
Additional information about the field activities from which these data were derived are available online at: http://cmgds.marine.usgs.gov/fan_info.php?fan=2014-620-FA
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20140426
Ending_Date: 20140429
Currentness_Reference: ground condition at time data were collected
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Not planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -123.586931
East_Bounding_Coordinate: -123.413227
North_Bounding_Coordinate: 48.158893
South_Bounding_Coordinate: 48.132058
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:5849a0b9e4b071492e42da9a
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: bathymetry
Theme_Keyword: bathymetry measurement
Theme_Keyword: GPS measurement
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
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: single-beam echo sounder
Theme_Keyword: Global Positioning System (GPS) observations
Theme:
Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD)
Theme_Keyword: Water Depth
Theme_Keyword: GPS (Global Positioning System)
Theme_Keyword: Echo Sounders
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Clallum County
Place_Keyword: Olympic Peninsula
Place_Keyword: Strait of Juan de Fuca
Place_Keyword: Elwha River
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(s) of the dataset and in products derived from these data. This information is not intended for navigational purposes.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Andrew W. Stevens
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission St.
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: USA
Contact_Voice_Telephone: 831-460-7424
Contact_Electronic_Mail_Address: astevens@usgs.gov
Cross_Reference:
Citation_Information:
Originator: International Hydrographic Organization (IHO)
Publication_Date: 2008
Title: IHO standards for hydrographic surveys (5th ed.)
Geospatial_Data_Presentation_Form: comma-delimited text
Publication_Information:
Publication_Place: Monaco
Publisher: International Hydrographic Bureau Special Publication 44, 28p.
Online_Linkage: https://www.iho.int/iho_pubs/standard/S-44_5E.pdf
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: No formal attribute accuracy tests were conducted
Logical_Consistency_Report: All data falls within expected ranges.
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:
A series of benchmarks with known coordinates were established adjacent to the study area to provide geodetic control for the bathymetric surveys. The positions of the benchmarks were derived from a minimum of two static GNSS occupations. The equipment for the static occupations consisted of a dual frequency Trimble R7 GNSS receiver, a fixed-height tripod, and Trimble Geodetic Model 2 antenna. The static observations were recorded internally in the receiver and the raw observations were processed using the National Geodetic Survey Online Positioning User Service (OPUS, https://www.ngs.noaa.gov/OPUS/). Estimated uncertainties in the horizontal position of the individual GNSS occupations were provided by OPUS and ranged between 0.006 m and 0.06 m with an average horizontal uncertainty of 0.02 m. The processed positions from each occupation were averaged to obtain the final reported position of the benchmark. All final positions of the survey vessels were determined using differential corrections from the base station receivers. Manufacturer reported accuracy for the differentially corrected horizontal positions for the Trimble R7 rover trajectories is 0.8 cm + 0.5 ppm. Baselines from the GNSS base station were typically less than 5 km, suggesting a horizontal accuracy of survey-vessel positions to be 0.825 cm. The combined horizontal uncertainty from the base station coordinate solutions and rover trajectories is between 1.5 cm and 7 cm, with a mean horizontal uncertainty of 3 cm. Uncertainty in the horizontal positions associated with pitch and roll of the survey vessels is unknown.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Uncertainty in the final elevations is derived from the combination of uncertainty in the GNSS positioning and bathymetric sounding measurements. Manufacturer reported accuracy for the differentially corrected vertical positions for the Trimble R7 rover trajectories is 1.5 cm + 1 ppm. Baselines from the GNSS base station were typically less than 5 km, suggesting the vertical accuracy of survey vessel positions to be 2 cm relative to the base station coordinate. Combining the uncertainty in the elevation of the base station coordinates and rover positions yields a total uncertainty in the GNSS-derived survey-vessel positions of approximately 5 cm. Additional uncertainty in the final computed elevations data is related to unmeasured variability in the speed of sound used to compute depths from bathymetric soundings and, thus, are depth-dependent. Based on analysis of all available speed of sound measurements, we estimate uncertainties in the final depth soundings to be 0.6 percent of the water depth. The total vertical uncertainty is calculated using Equation 1: sigmat=sqrt(a^2+(b×d)^2), where sigmat is the total vertical uncertainty, a is the uncertainty of the GNSS vertical position, b is the depth-dependent uncertainty factor (0.006), and d is water depth (International Hydrographic Organization, 2008). Maximum water depths surveyed on this mapping mission are approximately 18 m yielding a maximum total vertical uncertainty of 12 cm. Uncertainty in the vertical positions associated with pitch and roll of the survey vessels is unknown.
Lineage:
Process_Step:
Process_Description:
Bathymetry data were collected between April 26 and April 29, 2014 using two identical single-beam sonar systems and global navigation satellite systems (GNSS) receivers mounted on personal watercraft (PWC). The sonar systems consisted of an Odom Echotrac CV-100 single-beam echosounder and 200 kHz transducer with a 9-degree beam angle. Raw acoustic backscatter returns were digitized by the echosounder with a vertical resolution of 1.25 cm. Depths from the echosounders were computed using sound velocity profiles measured using a YSI CastAway CTD during the survey. Positioning of the survey vessels was determined at 10-Hz using Trimble R7 GNSS receivers with Trimble Zephyr Model 2 antennas operating primarily in real-time kinematic (RTK) mode. Differential corrections were transmitted by a VHF radio to the PWC GNSS receivers at 1-Hz from a base station placed on a benchmark with known horizontal and vertical coordinates relative to the North American Datum of 1983 (CORS96 realization) and North American Vertical Datum of 1988. Output from the GNSS and sonar systems were combined in real time on the PWC by a computer running HYPACK (version 13.0.0.6) hydrographic survey software. Navigation information was displayed on a video monitor, allowing PWC operators to navigate along survey lines at speeds of 2 to 3 m/s.
Process_Date: 20140429
Process_Step:
Process_Description:
Positioning data from the GNSS were collected primarily in real-time kinematic (RTK) mode. Poor radio communication in some portions of the survey area prevented acquisition of RTK data. GNSS positioning data that were collected in autonomous mode were post-processed using Waypoint Grafnav (version 8.50.4320) to apply differential corrections from the base station GNSS receiver. Elevations relative to the NAVD88 vertical datum were computed using a static offset of -20.11 m based on the National Geodetic Survey Geoid09 offset computed at the base-station locations. Bathymetry data were merged with GNSS positions, and quality control was applied using the computer program transectViewer, a Graphical User Interface (GUI) programmed with the computer program MATLAB. Digitized depths were compared to the raw acoustic-backscatter signal to ensure accuracy of depths produced by the echosounder, and the GUI was used to digitize the bottom by hand where the echosounder signal processing failed, as was typical in areas with submerged aquatic vegetation. After the raw depths were adjusted, a running mean with a window length of 5 points (approximately 1 m distance) was used to remove high-frequency vertical fluctuations, such as those caused by pitch and roll of the survey vessels. The final data are projected in Cartesian coordinates using the Washington State Plane North, meters coordinate system.
Process_Date: 20140512
Process_Step:
Process_Description:
All available bathymetry data from the survey were compiled into a comma-delimited text file for distribution
Process_Date: 20161208
Process_Step:
Process_Description:
Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed.
Process_Date: 20201019
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description:
Performed minor edits to the metadata to correct typos. No data were changed
Process_Date: 20211014
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Susan A. Cochran
Contact_Position: Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-460-7545
Contact_Electronic_Mail_Address: scochran@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Lambert Conformal Conic
Lambert_Conformal_Conic:
Standard_Parallel: 47.5
Standard_Parallel: 48.73333333333333
Longitude_of_Central_Meridian: -120.8333333333333
Latitude_of_Projection_Origin: 47.0
False_Easting: 500000.0
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.001
Ordinate_Resolution: 0.001
Planar_Distance_Units: METERS
Geodetic_Model:
Horizontal_Datum_Name: NAD83 (CORS96)
Ellipsoid_Name: GRS_1980
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222101
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 0.001
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: Attribute Table
Entity_Type_Definition:
Table containing attribute information associated with the dataset
Entity_Type_Definition_Source: Producer defined
Attribute:
Attribute_Label: Survey_Date
Attribute_Definition:
The date corresponding to the start of the multi-day survey in mm/dd/yyyy format
Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 04/26/2014
Range_Domain_Maximum: 04/26/2014
Attribute_Units_of_Measure: date in mm/dd/yyyy format
Attribute:
Attribute_Label: Longitude
Attribute_Definition:
Longitude coordinate of data point relative to the North American Datum of 1983 (CORS96 realization)
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -123.586931
Range_Domain_Maximum: -123.413227
Attribute_Units_of_Measure: Decimal degrees
Attribute:
Attribute_Label: Latitude
Attribute_Definition:
Latitude coordinate of data point relative to the North American Datum of 1983 (CORS96 realization)
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 48.132058
Range_Domain_Maximum: 48.158893
Attribute_Units_of_Measure: Decimal degrees
Attribute:
Attribute_Label: X
Attribute_Definition:
East coordinate of data point relative to the North American Datum of 1983 (CORS96 realization), projected in the Washington State Plane, North, meters, coordinate system
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 295138.773
Range_Domain_Maximum: 308052.364
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: Y
Attribute_Definition:
North coordinate of data point relative to the North American Datum of 1983 (CORS96 realization), projected in the Washington State Plane, North, meters, coordinate system
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 129308.320
Range_Domain_Maximum: 132432.476
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: Ellip_Ht_m
Attribute_Definition:
Height in meters of data point with reference to the reference ellipsoid
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -45.341
Range_Domain_Maximum: -18.964
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: Ortho_Ht_m
Attribute_Definition:
Height in meters of data point with reference to the North American Vertical Datum of 1988 at the base station (-20.11 m above ellipsoid height).
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -25.231
Range_Domain_Maximum: 1.146
Attribute_Units_of_Measure: meters
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: U.S. Geological Survey - Science Base
Contact_Organization: U.S. Geological Survey
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
Country: USA
Contact_Voice_Telephone: 1-888-275-8747
Contact_Electronic_Mail_Address: sciencebase@usgs.gov
Resource_Description:
Bathymetry data are available as a comma-delimited text file (ew14_apr_pwc.txt), along with associated 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: comma-delimited text
Format_Version_Number: Matlab 9.0.0.341360
Format_Specification: text
Format_Information_Content: comma-delimited text
Transfer_Size: 65.9
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: Access_Instructions: Data can be downloaded via the Internet
Fees: None
Metadata_Reference_Information:
Metadata_Date: 20211014
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: 95060-5792
Country: US
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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