Digital elevation models (DEMs) of the Elwha River delta, Washington, July 2018

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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: 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: 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: 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:
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:
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:
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
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: 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 bathymetry data. The second link points to a landing page with all bathymetry 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: 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 bathymetry data. The second link points to a landing page with all bathymetry 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: 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: 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

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