Digital elevation models (DEMs) of the Elwha River delta, Washington, July 2016

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Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Andrew W. Stevens
Originator: Guy Gelfenbaum
Originator: Jonathan A. Warrick
Originator: Ian M. Miller
Originator: Heather M. Weiner
Publication_Date: 2016
Title:

Digital elevation models (DEMs) of the Elwha River delta, Washington, July 2016

Geospatial_Data_Presentation_Form: Esri ARC/INFO ASCII GRID
Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/F7GQ6VXX

Publication_Information:

Publication_Place: Santa Cruz, CA
Publisher: U.S. Geological Survey

Online_Linkage: https://doi.org/10.5066/F7GQ6VXX
Larger_Work_Citation:

Citation_Information:

Originator: Andrew W. Stevens
Originator: Guy Gelfenbaum
Originator: Jonathan A. Warrick
Originator: Ian M. Miller
Originator: Heather M. Weiner
Publication_Date: 2016
Title:

Bathymetry, topography, and sediment grain-size data from the Elwha River delta, Washington, July 2016

Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/F7GQ6VXX

Publication_Information:

Publication_Place: Santa Cruz, CA
Publisher: U.S. Geological Survey

Online_Linkage: https://doi.org/10.5066/F7GQ6VXX

Description:

Abstract:

This part of the data release presents a digital elevation model (DEM) derived from bathymetry and topography data of the Elwha River delta collected in July 2016. Two dams on the Elwha River, Washington State, USA trapped over 20 million m3 of sediment, reducing downstream sediment fluxes and contributing to erosion of the river's coastal delta. The removal of the Elwha and Glines Canyon dams between 2011 and 2014 induced massive increases in river sediment supply and provided an unprecedented opportunity to examine the response of a delta system to changes in sediment supply. The U.S. Geological Survey developed an integrated research program aimed at understanding the ecosystem responses following dam removal that included regular monitoring of coastal and nearshore bathymetry and topography. As part of this monitoring program, the USGS conducted a bathymetric and topographic survey in the Strait of Juan de Fuca on the Elwha River delta, Washington (USGS Field Activity Number 2016-653-FA). Bathymetry data were collected using two personal watercraft (PWCs) and a kayak, each equipped with single beam echosounders and survey-grade global navigation satellite systems (GNSS). Topography data were collected on foot with GNSS receivers mounted on backpacks. DEM surfaces were produced from all available elevation data using linear interpolation.

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: http://cmgds.marine.usgs.gov/fan_info.php?fan=2016-653-FA

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20160717
Ending_Date: 20160720

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: -123.591228
East_Bounding_Coordinate: -123.521400
North_Bounding_Coordinate: 48.159354
South_Bounding_Coordinate: 48.135123

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:582f4055e4b04d580bd4d01c

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

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_Person_Primary:

Contact_Person: Andrew W. Stevens
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: USA

Contact_Voice_Telephone: 831-460-7424
Contact_Electronic_Mail_Address: astevens@usgs.gov

Browse_Graphic:

Browse_Graphic_File_Name:

https://www.sciencebase.gov/catalog/file/get/582f4055e4b04d580bd4d01c?name=ew16_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/582f4055e4b04d580bd4d01c?name=ew16_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 Gelfenbaum
Originator: Jonathan A. Warrick
Originator: Ian M. Miller
Originator: Heather M. Weiner
Publication_Date: 2016
Title:

Nearshore bathymetry data from the Elwha River delta, Washington, July 2016

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/582f406de4b04d580bd4d614

Type_of_Source_Media: digital dataset
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20160717
Ending_Date: 20160720

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 Gelfenbaum
Originator: Jonathan A. Warrick
Originator: Ian M. Miller
Originator: Heather M. Weiner
Publication_Date: 2016
Title:

Topography data from the Elwha River delta, Washington, July 2016

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/582f4096e4b04d580bd4de08

Type_of_Source_Media: digital dataset
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20160717
Ending_Date: 20160720

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: 20160801

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

Process_Step:

Process_Description:

Performed minor edits to the metadata to correct typos. No data were changed

Process_Date: 20211014
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: Susan A. Cochran

Contact_Position: Geologist
Contact_Address:

Address_Type: Mailing and Physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060

Contact_Voice_Telephone: 831-460-7545
Contact_Electronic_Mail_Address: scochran@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: 0.01
Ordinate_Resolution: 0.01

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: -19.02
Range_Domain_Maximum: 5.93
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 (ew16_july_dem_5m.asc; ew16_july_dem_1m.asc), along with low-resolution browse graphics of each DEM in png format (ew16_july_dem_5m.png; ew16_july_dem_1m.png) and associated metadata (ew16_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: ASCII
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: 3.9

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://www.sciencebase.gov/catalog/file/get/582f4055e4b04d580bd4d01c/?name=ew16_july_dem_5m.asc

Access_Instructions: Data can be downloaded via the Internet

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: 1.1

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://www.sciencebase.gov/catalog/file/get/582f4055e4b04d580bd4d01c/?name=ew16_july_dem_5m.png

Access_Instructions: Data can be downloaded via the Internet

Digital_Form:

Digital_Transfer_Information:

Format_Name: ASCII
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/582f4055e4b04d580bd4d01c/?name=ew16_july_dem_1m.asc

Access_Instructions: Data can be downloaded via the Internet

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: 1.2

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://www.sciencebase.gov/catalog/file/get/582f4055e4b04d580bd4d01c/?name=ew16_july_dem_1m.png

Access_Instructions: Data can be downloaded via the Internet

Fees: None

Metadata_Reference_Information:

Metadata_Date: 20211014
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: 95060-5792
Country: US

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

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_F7GQ6VXX/ew16_july_dem.html>