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: 20230522 Title: Topography data from the Elwha River delta, Washington, August 2022 Geospatial_Data_Presentation_Form: comma-delimited text Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9N7N9P0 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/P9N7N9P0 Online_Linkage: https://www.sciencebase.gov/catalog/file/get/6171e1bad34ea36449a86d6b 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: 2023 Title: Bathymetry, topography, and sediment grain-size data from the Elwha River delta, Washington, August 2022 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9N7N9P0 Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA Publisher: U.S. Geological Survey Other_Citation_Details: Stevens, A.W., Gelfenbaum, G.R., Warrick, J.A., Miller, I.M., and Weiner, H.M., 2023, Bathymetry, topography, and sediment grain-size data from the Elwha River delta, Washington, August 2022: U.S. Geological Survey data release, https://doi.org/10.5066/P9N7N9P0. Online_Linkage: https://doi.org/10.5066/P9N7N9P0 Description: Abstract: This part of the data release presents topography data from the Elwha River delta collected in August 2022. Topography data were collected on foot with global navigation satellite system (GNSS) receivers mounted on backpacks. 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=2022-638-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: 20220809 Ending_Date: 20220811 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: -123.5879121 East_Bounding_Coordinate: -123.4720889 North_Bounding_Coordinate: 48.1513719 South_Bounding_Coordinate: 48.1317098 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: topography Theme_Keyword: GPS measurement 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:6418cb68d34eb496d1d1d715 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) 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 and topographic 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 GNSS receiver, a fixed-height tripod, and antenna. The static observations were recorded internally in the receiver and the raw observations were processed using the National Geodetic Survey (NGS) 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 GNSS backpacks were determined using differential corrections from the base station receivers. Manufacturer reported accuracy for the differentially corrected horizontal positions for the rover receivers used in the survey is 0.8 cm + 0.5 ppm. Baselines from the GNSS base station were typically less than 5 km, suggesting a horizontal accuracy of backpack 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 therefore approximately 3 cm. Uncertainty in the horizontal positions associated with variable posture during data collection of the surveyors is unknown. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The vertical uncertainty of topographic measurements is estimated by combining the uncertainty in the base station coordinate and remote GNSS positions collected in kinematic mode. Uncertainties in the elevation of the base station were provided by NGS OPUS and ranged between 0.02 m and 0.04 m, with an average vertical uncertainty of 0.03 m. Manufacturer reported vertical accuracy in the rover positions is 1.5 cm + 1 ppm for differential corrected kinematic data for the rover receivers used in the surveys. Baseline lengths were typically less than 5 km, suggesting the vertical accuracy of backpack positions to be 2 cm relative to the base station coordinates. Combining the uncertainty in the elevation of the base station coordinates and rover positions yields a total uncertainty in the backpack GNSS positions of approximately 5 cm. Uncertainty in the vertical positions associated with variable posture of the surveyors during data collection is unknown. Lineage: Process_Step: Process_Description: Topographic data were collected between August 9 and August 11, 2022, on foot with GNSS equipment mounted on backpacks operating primarily in real-time kinematic (RTK) mode. GNSS backpacks were equipped with a dual-frequency GNSS receivers and handheld data collectors. Differential corrections were transmitted at 1-Hz intervals by a VHF radio to the backpack GNSS receivers from a GNSS 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. Prior to data collection, vertical distances between the GNSS antenna and the ground were measured using a tape measure for each topographic surveyor. Hand-held data collectors were used to log raw data and display navigational information allowing surveyors to navigate along predefined survey lines spaced at 25- to 50-m intervals along the delta. Profiles were surveyed from the landward edge of the primary dune over the beach foreshore, to wading depth on the same series of transects as the nearshore bathymetry platforms. Additional topography data between transects were collected to better characterize morphologic variability within the study area. Process_Date: 20220811 Process_Step: Process_Description: Raw topography data were reviewed in Trimble Business Center (TBC) to ensure measured antenna offsets were applied properly in the field. Differential post-processing was performed on points collected in autonomous mode where VHF communication with the base station failed. Orthometric elevations relative to the NAVD88 vertical datum were 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 stations. The final point data are projected in cartesian coordinates using the Washington State Plane North, meters coordinate system. Process_Date: 20220919 Process_Step: Process_Description: All available topographic data from the survey were compiled into a comma-delimited text file for distribution Process_Date: 20230317 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: 211811 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: 2022-Aug-09 13:47:44.000 Range_Domain_Maximum: 2022-Aug-11 18:01:13.000 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: -123.5879121 Range_Domain_Maximum: -123.4720889 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: 48.1317098 Range_Domain_Maximum: 48.1513719 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: 295033.01 Range_Domain_Maximum: 303641.91 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: 129276.05 Range_Domain_Maximum: 131599.49 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: -1.81 Range_Domain_Maximum: 5.50 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: Topography data are available as a comma-delimited text file (ew22_topo.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: 15.18 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/6418cb68d34eb496d1d1d715?name=ew22_topo.csv Network_Resource_Name: https://www.sciencebase.gov/catalog/item/6418cb68d34eb496d1d1d715 Network_Resource_Name: https://doi.org/10.5066/P9N7N9P0 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 topographic data. The second link points to a landing page with the topographic data and metadata. The third link points to the landing page for the data release containing all data collected during the survey. The fourth link points to a landing page for all of the Elwha coastal surveys. Fees: None Metadata_Reference_Information: Metadata_Date: 20230522 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