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: 2019 Title: Digital elevation models (DEMs) of the Elwha River delta, Washington, July 2017 Geospatial_Data_Presentation_Form: Esri ARC/INFO ASCII GRID Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9AJ8ALB 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/P9AJ8ALB 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: 2019 Title: Bathymetry, topography, and sediment grain-size data from the Elwha River delta, Washington, July 2017 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9AJ8ALB 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/P9AJ8ALB 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 2017 (USGS Field Activity Number 2017-638-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. The final data were projected in Cartesian coordinates using the Washington State Plane North (meters) coordinate system. A total of 1,270,212 individual elevation points were collected within the survey area between July 20 and July 23, 2017. 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 are available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-638-FA Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20170720 Ending_Date: 20170723 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: -123.591538 East_Bounding_Coordinate: -123.520296 North_Bounding_Coordinate: 48.159538 South_Bounding_Coordinate: 48.135183 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:5c9bf7bae4b0b8a7f62c32cb 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: 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: topographic mapping Theme_Keyword: Global Positioning System (GPS) observations Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: elevation Theme: Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD) Theme_Keyword: Water Depth Theme_Keyword: GPS (Global Positioning System) Theme_Keyword: Echo Sounders 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 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 navigational 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/5c9bf7bae4b0b8a7f62c32cb?name=ew17_july_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/5c9bf7bae4b0b8a7f62c32cb?name=ew17_july_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 9.0.0.341360 running on Microsoft Windows 7 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 ascii 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: Repeatability tests were conducted across different survey platforms, but no comparisons to "true" values were conducted. Logical_Consistency_Report: All data fall 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: 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: 2019 Title: Nearshore bathymetry data from the Elwha River delta, Washington, July 2017 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/file/get/5c9bf756e4b0b8a7f62c32c1 Type_of_Source_Media: digital dataset Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20170720 Ending_Date: 20170722 Source_Currentness_Reference: ground condition at time data were collected Source_Citation_Abbreviation: bathymetry 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: 2019 Title: Topography data from the Elwha River delta, Washington, July 2017 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/file/get/5c9bf77fe4b0b8a7f62c32c5 Type_of_Source_Media: digital dataset Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20170720 Ending_Date: 20170723 Source_Currentness_Reference: ground condition at time data were collected Source_Citation_Abbreviation: topography 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: all sources cited were used Process_Date: 20170901 Process_Step: Process_Description: Edits were made to standardize a few of the "None" keywords. Process_Date: 20190620 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Susan A Cochran 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: United States Contact_Voice_Telephone: 831-460-7545 Contact_Electronic_Mail_Address: scochran@usgs.gov 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 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: Elevation relative to the North American Vertical Datum of 1988 at the base station (-20.11 m above the reference ellipsoid). Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -22.07 Range_Domain_Maximum: 5.24 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: DEM grids are available in Esri ARC/INFO ASCII GRID format (ew17_july_dem_5m.asc; ew17_july_dem_1m.asc), along with low-resolution browse graphics of each DEM in png format (ew17_july_dem_5m.png; ew17_july_dem_1m.png) and associated metadata (ew17_july_dem.xml). 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: 14.1 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5c9bf7bae4b0b8a7f62c32cb/?name=ew17_feb_dem_1m.asc Network_Resource_Name: https://www.sciencebase.gov/catalog/item/5c9bf7bae4b0b8a7f62c32cb Network_Resource_Name: https://doi.org/10.5066/P9AJ8ALB Access_Instructions: Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the ASCII grid. The second link points to a landing page with DEM data, metadata, and browse images. The third link points to a landing page for the entire data release. 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: 4.5 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5c9bf7bae4b0b8a7f62c32cb/?name=ew17_july_dem_5m.asc Network_Resource_Name: https://www.sciencebase.gov/catalog/item/5c9bf7bae4b0b8a7f62c32cb Network_Resource_Name: https://doi.org/10.5066/P9AJ8ALB Access_Instructions: Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the ASCII grid. The second link points to a landing page with DEM data, metadata, and browse images. The third link points to a landing page for the entire data release. Digital_Form: Digital_Transfer_Information: Format_Name: png Format_Version_Number: Matlab 9.0.0.341360 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: 1.8 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5c9bf7bae4b0b8a7f62c32cb/?name=ew17_feb_dem_1m.png Network_Resource_Name: https://www.sciencebase.gov/catalog/item/5c9bf7bae4b0b8a7f62c32cb Network_Resource_Name: https://doi.org/10.5066/P9AJ8ALB Access_Instructions: Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the PNG file. The second link points to a landing page with DEM data, metadata, and browse images. The third link points to a landing page for the entire data release. Digital_Form: Digital_Transfer_Information: Format_Name: png Format_Version_Number: Matlab 9.0.0.341360 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: 0.85 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5c9bf7bae4b0b8a7f62c32cb/?name=ew17_july_dem_5m.png Network_Resource_Name: https://www.sciencebase.gov/catalog/item/5c9bf7bae4b0b8a7f62c32cb Network_Resource_Name: https://doi.org/10.5066/P9AJ8ALB Access_Instructions: Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the PNG file. The second link points to a landing page with DEM data, metadata, and browse images. The third link points to a landing page for the entire data release. Fees: None Metadata_Reference_Information: Metadata_Date: 20201019 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