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: Digital elevation models (DEMs) of the Elwha River delta, Washington, July 2018 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/617301f2d34ea36449a882f1 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 portion of the USGS data release presents digital elevation models (DEMs) derived from bathymetric and topographic surveys conducted on the Elwha River delta in July 2018 (USGS Field Activity Number 2018-648-FA). Nearshore bathymetry data were collected using two personal watercraft (PWCs) and a kayak equipped with single-beam echosounders and survey-grade global navigation satellite systems (GNSS) receivers. Topographic data were collected on foot with survey-grade GNSS receivers mounted on backpacks. Positions of the survey platforms were referenced to 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 based on NGS Geoid09 vertical offsets. The final data were projected in Cartesian coordinates using the Washington State Plane North (meters) coordinate system. A total of 1,216,804 individual elevation points were collected within the survey area between July 23 and July 26, 2018. DEM surfaces were produced from all available elevation data using linear interpolation. Two separate DEMs were constructed. A DEM was produced that covered the entire survey area (approximately 511 ha) with 5-m horizontal resolution. A second DEM with 1-m resolution was produced that covered the river mouth and adjacent areas (approximately 131 ha). The DEMs were created by interpolating between measurements as much as 50 meters apart. For this reason, we cannot evaluate the accuracy of each point in the DEM, only the measurements it is based on. The estimated vertical uncertainties of the bathymetric and topographic measurements are 12 and 5 cm, respectively. Digital data files for each DEM are provided in ESRI ARC ASCII (*.asc) format. 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. 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: 20180723 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: -123.5916031 East_Bounding_Coordinate: -123.5212333 North_Bounding_Coordinate: 48.1594708 South_Bounding_Coordinate: 48.1351368 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: bathymetry measurement Theme_Keyword: topography Theme_Keyword: GPS measurement Theme_Keyword: digital elevation models Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: single-beam echo sounder Theme_Keyword: topographic mapping 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:617301f2d34ea36449a882f1 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 Browse_Graphic: Browse_Graphic_File_Name: https://www.sciencebase.gov/catalog/file/get/617301f2d34ea36449a882f1?name=ew18_dem_5m.png&allowOpen=true Browse_Graphic_File_Description: image map showing 5-m resolution digital elevation model (DEM) of Elwha River delta, color-coded to show elevation Browse_Graphic_File_Type: PNG Browse_Graphic: Browse_Graphic_File_Name: https://www.sciencebase.gov/catalog/file/get/617301f2d34ea36449a882f1?name=ew18_dem_1m.png&allowOpen=true Browse_Graphic_File_Description: image map showing 1-m resolution digital elevation model (DEM) of Elwha River mouth, color-coded to show elevation Browse_Graphic_File_Type: PNG 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: Digital elevation models (DEMs) are created by interpolating between elevation measurements as much as 50 meters apart, for this reason we cannot evaluate the accuracy of each point in a DEM, only the original data from which it is generated. The horizontal accuracy of the individual points was assessed based on the combined uncertainty of GNSS base stations and kinematic (rover) data points. Manufacturer-reported accuracy for the differentially corrected horizontal positions for the Trimble R7, R8 and R10 receivers used to collect the topographic and bathymetric measurements 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 vessels and variable surveyor posture during the backpack surveys is unknown. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Digital elevation models (DEMs) are created by interpolating between elevation measurements as much as 50 meters apart, for this reason we cannot evaluate the accuracy of each point in a DEM, only the original data from which it is generated. An estimated vertical accuracy of 5 cm for the topographic GNSS backpack survey platforms was estimated by combining uncertainty in the base station coordinates and the manufacturer reported vertical accuracy of 1.5 cm + 1 ppm for differential corrected kinematic data. Additional uncertainty in the final computed elevations in the bathymetry 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 sound velocity casts, we estimate the uncertainty in the final elevations to be 0.6 percent of water depth. The total vertical uncertainty is calculated using the standard equation sigmat=v(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 by the personal watercraft are approximately 18 m, yielding a maximum total vertical uncertainty of 12 cm. Lineage: Source_Information: Source_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: Nearshore bathymetry data from the Elwha River delta, Washington, July 2018, collected from personal watercraft Geospatial_Data_Presentation_Form: comma-delimited text Publication_Information: Publication_Place: online Publisher: U.S. Geological Survey, Pacific Coastal and Marine Science Center Online_Linkage: https://www.sciencebase.gov/catalog/item/6171daded34ea36449a86d49 Type_of_Source_Media: digital dataset Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20180723 Ending_Date: 20180725 Source_Currentness_Reference: ground condition at time data were collected Source_Citation_Abbreviation: pwc bathy data Source_Contribution: Bathymetry data were combined with topography data, and then interpolated into a gridded surface Source_Information: Source_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: Nearshore bathymetry data from the Elwha River delta, Washington, July 2018, collected from kayak Geospatial_Data_Presentation_Form: comma-delimited text Publication_Information: Publication_Place: online Publisher: U.S. Geological Survey, Pacific Coastal and Marine Science Center Online_Linkage: https://www.sciencebase.gov/catalog/item/6172f789d34ea36449a882a3 Type_of_Source_Media: digital dataset Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20180725 Ending_Date: 20180726 Source_Currentness_Reference: ground condition at time data were collected Source_Citation_Abbreviation: kayak bathy data Source_Contribution: Bathymetry data were combined with topography data, and then interpolated into a gridded surface Source_Information: Source_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: Topography data from the Elwha River delta, Washington, July 2018 Geospatial_Data_Presentation_Form: comma-delimited text Publication_Information: Publication_Place: online Publisher: U.S. Geological Survey, Pacific Coastal and Marine Science Center Online_Linkage: https://www.sciencebase.gov/catalog/item/6171e1bad34ea36449a86d6b Type_of_Source_Media: digital dataset Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20180723 Ending_Date: 20180726 Source_Currentness_Reference: ground condition at time data were collected Source_Citation_Abbreviation: topo data Source_Contribution: Topography data were combined with bathymetry data, and then interpolated into a gridded surface Process_Step: Process_Description: Quality control was applied to raw topography and bathymetry data. Comparisons were performed to ensure internal consistency between the survey platforms. DEMs were produced by linear interpolation of all available elevation point data with the computer program MATLAB. Data were exported in ESRI ARC ascii grid format for distribution. Source_Used_Citation_Abbreviation: pwc bathy data Source_Used_Citation_Abbreviation: kayak bathy data Source_Used_Citation_Abbreviation: topo data Process_Date: 20190416 Process_Step: Process_Description: Corrected typos in the Access Instruction sections of both DEMs. No data were changed. (scochran@usgs.gov) Process_Date: 20230501 Process_Step: Process_Description: Corrected mising process date. No data were changed. (mau@usgs.gov) Process_Date: 20230817 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster 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: 0.01 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 data set Entity_Type_Definition_Source: Producer defined Attribute: Attribute_Label: Elevation 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. Elevation range given here is for the 5-m resolution overall DEM. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -19.003 Range_Domain_Maximum: 5.319 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: 1-m and 5-m resolution DEM grids are available in Esri ARC/INFO ASCII GRID format (.asc), along with low-resolution browse graphics of each DEM in png format and 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: ArcInfo GRID format Format_Version_Number: ArcGIS 10.1 Format_Specification: Esri ARC/INFO ASCII GRID Format_Information_Content: Esri ARC ASCII raster containing 1-m resolution digital elevation model of the Elwha River mouth File_Decompression_Technique: none Transfer_Size: 16.16 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/617301f2d34ea36449a882f1/?name=ew18_dem_1m.asc Network_Resource_Name: https://www.sciencebase.gov/catalog/item/617301f2d34ea36449a882f1 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 1-m resolution DEM data. The second link points to a landing page with all DEM data and metadata. The third link points to the landing page for the July 2018 data release. The fourth link points to a landing page for all of the Elwha annual surveys. Digital_Form: Digital_Transfer_Information: Format_Name: ArcInfo GRID format Format_Version_Number: ArcGIS 10.1 Format_Specification: Esri ARC/INFO ASCII GRID Format_Information_Content: Esri ASCII raster file containing 5-m resolution digital elevation model of the Elwha River delta File_Decompression_Technique: none Transfer_Size: 4.45 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/617301f2d34ea36449a882f1/?name=ew18_dem_5m.asc Network_Resource_Name: https://www.sciencebase.gov/catalog/item/617301f2d34ea36449a882f1 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 5-m resolution DEM data. The second link points to a landing page with all DEM data and metadata. The third link points to the landing page for the July 2018 data release. The fourth link points to a landing page for all of the Elwha annual surveys. Digital_Form: Digital_Transfer_Information: Format_Name: png Format_Version_Number: MATLAB Version 9.8.0.1396136 (R2020a) Format_Specification: PNG Image Format_Information_Content: PNG image showing 1-m resolution digital elevation model of the Elwha River mouth File_Decompression_Technique: none Transfer_Size: 1.86 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/617301f2d34ea36449a882f1/?name=ew18_dem_1m.png Network_Resource_Name: https://www.sciencebase.gov/catalog/item/617301f2d34ea36449a882f1 Network_Resource_Name: https://www.sciencebase.gov/catalog/item/6171d80ed34ea36449a86d3f 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. Digital_Form: Digital_Transfer_Information: Format_Name: png Format_Version_Number: MATLAB Version 9.8.0.1396136 (R2020a) Format_Specification: PNG Image Format_Information_Content: PNG image showing 5-m resolution digital elevation model of the Elwha River delta File_Decompression_Technique: none Transfer_Size: 0.93 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/617301f2d34ea36449a882f1/?name=ew18_dem_5m.png Network_Resource_Name: https://www.sciencebase.gov/catalog/item/617301f2d34ea36449a882f1 Network_Resource_Name: https://www.sciencebase.gov/catalog/item/6171d80ed34ea36449a86d3f 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: 20230817 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