Metadata: Identification_Information: Citation: Citation_Information: Originator: Andrew W. Stevens Originator: Guy R. Gelfenbaum Originator: Jonathan A. Warrick Originator: Ian M. Miller Originator: Heather M. Weiner Publication_Date: 20220311 Title: Nearshore bathymetry data from the Elwha River delta, Washington, July 2018, collected from kayak Geospatial_Data_Presentation_Form: comma-delimited text Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9KXA2SI 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/P9KXA2SI Online_Linkage: https://www.sciencebase.gov/catalog/item/6172f789d34ea36449a882a3? Larger_Work_Citation: Citation_Information: Originator: Andrew W. Stevens Originator: Guy R. Gelfenbaum Originator: Jonathan A. Warrick Originator: Ian M. Miller Originator: Heather M. Weiner Publication_Date: 2022 Title: Bathymetry, topography, and sediment grain-size data from the Elwha River delta, Washington, July 2018 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9KXA2SI 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/P9KXA2SI Description: Abstract: This part of the data release presents bathymetry data from the Elwha River delta collected in July 2018 (USGS Field Activity Number 2018-648-FA) using a kayak. The kayak was equipped with a single-beam echosounder and a survey-grade global navigation satellite system (GNSS) receiver. 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 is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2018-648-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20180725 Ending_Date: 20180726 Currentness_Reference: Ground condition at time data were collected Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -123.5690931 East_Bounding_Coordinate: -123.5594942 North_Bounding_Coordinate: 48.1499537 South_Bounding_Coordinate: 48.1441507 Keywords: 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: USGS Thesaurus Theme_Keyword: bathymetry Theme_Keyword: GPS measurement Theme_Keyword: sea-floor characteristics Theme_Keyword: marine geophysics Theme_Keyword: single-beam echo sounder Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: Global Positioning System (GPS) observations 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:6172f789d34ea36449a882a3 Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Clallam 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 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 Native_Data_Set_Environment: MATLAB Version: 9.8.0.1396136 (R2020a) Cross_Reference: Citation_Information: Originator: International Hydrographic Organization (IHO) Publication_Date: 2008 Title: IHO standards for hydrographic surveys (5th ed.) 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: 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: A series of benchmarks with known coordinates were established adjacent to the study area to provide geodetic control for the bathymetric survey. 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 vessel were determined using differential corrections from the base station receivers. Manufacturer reported accuracy for the differentially corrected horizontal positions for the Trimble R10 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 relative to the base station. 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 vessel is unknown. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Uncertainty in the final elevations are 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 R10 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 variability in the speed of sound used to compute depths from bathymetric soundings and, thus, are depth-dependent. The speed of sound in the river was not measured and we estimate the uncertainty in the final elevations to be 2 percent of 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 (0.02), and d is water depth. Maximum water depths surveyed by the kayak are approximately 3 m yielding a maximum total vertical uncertainty of 8 cm. Uncertainty in the vertical positions associated with pitch and roll of the kayak is unknown. Lineage: Process_Step: Process_Description: Bathymetry data were collected on July 25 and 26, 2017 in the river channel and portions of the estuary using a kayak equipped with a SonarMite single-beam echosounder and 200 kHz transducer with a 4-degree beam angle. Depths from the kayak sonar were computed assuming a sound velocity of 1,460 m/s. Positioning of the kayak was determined at 1-Hz using a Trimble R10 integrated GNSS receiver and antenna operating in real-time kinematic (RTK) mode. Differential corrections were transmitted by a VHF radio to the GNSS receiver on the kayak 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. Bathymetric soundings and positioning data were recorded on a Trimble TSC2 data collector. Process_Date: 20180726 Process_Step: Process_Description: Raw data were reviewed and quality control was applied using Trimble Business Center software. 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. The final data are projected in Cartesian coordinates using the Washington State Plane North, meters coordinate system. Process_Date: 20190416 Process_Step: Process_Description: All available bathymetry data from the survey were compiled into a comma-delimited text file for distribution Process_Date: 20211020 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Point Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 4298 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.0000001 Longitude_Resolution: 0.0000001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 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: 0.01 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: datetime_utc Attribute_Definition: The date and time of data collection in Coordinated Universal Time (UTC). Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2018-Jul-25 22:46:14.000 Range_Domain_Maximum: 2018-Jul-26 00:14:27.000 Attribute_Units_of_Measure: date and time in yyyy-mmm-dd HH:MM:SS.FFF format Attribute: Attribute_Label: longitude Attribute_Definition: Longitude coordinate of data point relative to the North American Datum of 1983 Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -123.5690931 Range_Domain_Maximum: -123.5594942 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 Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 48.1441507 Range_Domain_Maximum: 48.1499537 Attribute_Units_of_Measure: Decimal degrees Attribute: Attribute_Label: easting_m Attribute_Definition: East coordinate of data point relative to the North American Datum of 1983, projected in the Washington State Plane North, meters, coordinate system Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 296482.83 Range_Domain_Maximum: 297200.85 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: northing_m Attribute_Definition: North coordinate of data point relative to the North American Datum of 1983,projected in the Washington State Plane South, meters, coordinate system Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 130809.79 Range_Domain_Maximum: 131449.63 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: ortho_ht_m Attribute_Definition: Height in meters relative to the NAVD88 vertical datum, computed assuming a static geoid value of -20.11 m which is based on the NGS Geoid09 offset at the location of the GNSS base station Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -1.01 Range_Domain_Maximum: 1.35 Attribute_Units_of_Measure: meters Overview_Description: Entity_and_Attribute_Overview: The first line of the csv file is a header line. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey 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 (ew18_bathy_kayak.csv), along with associated 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: comma-delimited text Format_Version_Number: MATLAB Version: 9.8.0.1396136 (R2020a) Format_Information_Content: comma-delimited text file File_Decompression_Technique: No compression applied Transfer_Size: 0.32 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/6172f789d34ea36449a882a3?name=ew18_kayak.csv Network_Resource_Name: https://www.sciencebase.gov/catalog/item/6172f789d34ea36449a882a3 Network_Resource_Name: https://doi.org/10.5066/P9KXA2SI Network_Resource_Name: https://doi.org/10.5066/F72N51GC Access_Instructions: Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the bathymetry data. The second link points to a landing page with all bathymetry data and metadata. The third link points to a landing page for the annual survey. The fourth link points to a landing page for the entire data release. Fees: None Metadata_Reference_Information: Metadata_Date: 20220311 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