Peter Dartnell
Jonathan A. Warrick
20201104
Bathymetry data collected in 2016 offshore the Elwha River mouth, Washington, during USGS Field Activity 2016-605-FA
GeoTIFF
data release
DOI:10.5066/P9YVVAMT
Pacific Coastal and Marine Science Center, Santa Cruz, California
U.S. Geological Survey
https://doi.org/10.5066/P9YVVAMT
Peter Dartnell
Jonathan A. Warrick
2020
Bathymetry and acoustic-backscatter data collected in 2016 offshore the Elwha River mouth, Washington, during USGS Field Activity 2016-605-FA
data release
DOI:10.5066/P9YVVAMT
Pacific Coastal and Marine Science Center, Santa Cruz, CA
U.S. Geological Survey
https://doi.org/10.5066/P9YVVAMT
These metadata describe bathymetry data collected during a 2016 SWATHPlus-M survey offshore the Elwha River mouth, Strait of Juan de Fuca, Washington. Data were collected and processed by the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC) with fieldwork activity number 2016-605-FA. The bathymetry data are provided as a GeoTIFF image in UTM, zone 10, NAD83 coordinates, vertically referenced to NAVD88.
Sonar-based surveys of the seafloor around the Elwha River mouth, Strait of Juan de Fuca, Washington were conducted to map changes that have occurred following sediment input from dam removals from the Department of the Interior's Elwha River Restoration Project. This project resulted in the removal of two large dams on the Elwha River during 2011-2014, which released millions of tonnes of sediment to the river and coast. Similar sonar-based surveys were conducted before the dam removals in 2008 and 2010 by the USGS, and these pre-removal surveys may be used for comparisons with the data provided herein. Collaborative partners in this work include the Lower Elwha Klallam Tribe.
Additional information about the field activity from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2016-605-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.
20160213
20160218
ground condition at time data were collected.
None planned
-123.610
-123.470
48.160
48.130
USGS Metadata Identifier
USGS:9a86e7e8-4f6b-4837-a462-149d681f25a4
ISO 19115 Topic Category
geoscientificInformation
elevation
USGS Thesaurus
bathymetry
bathymetry measurement
sea-floor characteristics
geospatial datasets
marine geophysics
sonar methods
Data Categories for Marine Planning
Bathymetry and Elevation
Marine Realms Information Bank (MRIB) keywords
field observation
none
U.S. Geological Survey
USGS
Coastal and Marine Hazards and Resources Program
CMHRP
Pacific Coastal and Marine Science Center
PCMSC
Geographic Names Information System (GNIS)
Strait of Juan de Fuca
State of Washington
Elwha River
none
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 originators of the dataset and in products derived from these data. This information is not intended for navigation purposes.
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
2016_Elwha_bathymetry_QV.jpg
Quickview image of bathymetry data collected in 2016 offshore the Elwha River mouth, Strait of Juan de Fuca, Washington
JPEG
Caris HIPS and SIPS (version 9) and ArcMap (ver. 10.3.1) on a Windows 10 computer.
The SWATHPlus-M sonar system (234 kHz) depth accuracy reduces with horizontal range. The system has an estimated vertical depth uncertainty ranging from about 0.05 m to 0.30 m over a horizontal range of 0 to 90 m (https://www.iter-systems.com/wp-content/uploads/2020/03/ETD_2002_Bathyswath-2_Tech-info_EN.pdf). Accuracies of final products may be lower due to total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations.
No formal logical accuracy tests were conducted
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.
Uncertainty in the horizontal position of each sounding is a function of the total uncertainty propagated through each of the following component instruments: 1) vessel GPS, 2) intertial motion unit (IMU), 3) water sound velocity model, and 4) beam spreading in the water column. Assuming no systematic errors in the measurement instruments themselves, beam spreading is the dominate source of positional uncertainty. The 1-degree sonar beam of the SWATHplus-M results in horizontal uncertainty ranging from 0.10 m at 10 m slant range, to about 0.45 m at 50 m slant range. Accuracies of final products may be lower due to data processing that includes sounding cleaning, gridding, and datum transformations.
The Applanix POS-MV post-processed vertical positional accuracy is about 0.2 m (https://www.applanix.com/downloads/products/specs/posmv/POS-MV-WaveMaster-II.pdf). The SWATHPlus-M sonar system (234 kHz) has a measurement resolution limit of about 0.6 cm and a resolution detection limit of about 3 mm (http://www.bathyswath.com/sites/default/files/documents/ETD_2002_Bathyswath%20information_EN.pdf). Accuracies of final products may be lower due to total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations.
The Swath bathymetric survey was conducted with a SWATHplus-M 234-kHz interferometric side-scan sonar system pole-mounted on the U.S. Geological Survey (USGS) R/V Parke Snavely. During the mapping mission, an Applanix POS-MV (Position and Orientation System for Marine Vessels) was used to position the vessel during data collection and it also accounted for vessel motion such as heave, pitch, and roll. The POS-MV also recorded position and vessel motion parameters for later post-processing. Sound-velocity profiles were collected throughout the survey days with a Castaway sound velocimeter. Post-processed POS-MV Smoothed Best Estimate of Trajectory (SBET) files were merged with the survey line files using BathySwath software and then the line files were imported into Caris HIPS and SIPS software. Soundings were cleaned for obvious errors and gridded into a 2-m base surface. The base surface was exported as an XYZ ascii file in UTM-10 coordinates referenced to the WGS84 ellipsoid. The ascii file was transformed to UTM-10, NAD83(2011) coordinates relative NAVD88 using VDatum software (version 3.7). The transformed XYZ ascii file was gridded into a 2-m resolution surface using Fledermaus software (version 7.8) converted to an ASCIIRaster file and imported into Esri ArcMap (version 10.3.1). The bathymetry grid was then exported as a TIFF file in UTM zone 10, NAD-83(2011) coordinates, relative to NAVD88.
2016
Corrected working URL links to cmgds data repository to the actual published links
20210317
U.S. Geological Survey
Susan A. Cochran
Geologist
Mailing and Physical
2885 Mission Street
Santa Cruz
CA
95060
831-460-7545
scochran@usgs.gov
Performed minor edits to the metadata to correct typos. No data were changed
20211013
U.S. Geological Survey
Susan A. Cochran
Geologist
Mailing and Physical
2885 Mission Street
Santa Cruz
CA
95060
831-460-7545
scochran@usgs.gov
Raster
Grid Cell
1511
5126
1
Universal Transverse Mercator
10
0.9996
-123
0.0
500000
0.0
row and column
2.0
2.0
meters
North American Datum of 1983 (2011)
Geodetic Reference System 80
6378137
298.257
North American Vertical Datum 1988 (NAVD-88)
0.01
meters
Explicit elevation coordinate included with horizontal coordinates
value
depth in meters relative to NAVD-88
Producer defined
The complete 2016 2-m resolution grid "2016_ElwhaDelta_2m_bathymetry_UTM10_NAD83_NAVD88.tif" was originally archived as a TIFF image with the following attributes.
>Cell size = 2.0
>Number of rows = 1511
>Number of columns = 5126
>
>Data type = floating point
>
>Boundary
>Xmin = 454700
>Xmax = 464952
>Ymin = 5331058
>Ymax = 5334080
>
>Statistics
>Minimum value = -23.5
>Maximum value = -4.3
>Mean = -9.0
>Standard deviation = 5.24
>
>Coordinate system description
>Projection UTM
>Zone 10
>Datum NAD83
>Vertical Reference NAVD88
>Units meter
U.S. Geological Survey
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Mailing and Physical
2885 Mission Street
Santa Cruz
CA
95060
1-888-427-4747
pcmsc_data@usgs.gov
These data are available in GeoTIFF format, including a tif world file (.tfw) and CSDGM FGDC-compliant metadata.
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.
GeoTIFF
ArcMap (version 10.3.1)
Downloadable zip file contains the TIFF (.tif) version of the bathymetry data and a projection file (.tfw).
WinZip
4
https://doi.org/10.5066/P9YVVAMT
Data can be downloaded using the Network_Resource_Name link and scrolling down to the Sonar Data section.
None.
The downloadable data file has been compressed with the "zip" command and can be unzipped with Winzip (or other tool) on Windows systems. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing a GeoTIFF file.
20211013
U.S. Geological Survey, Pacific Coastal and Marine Science Center
PCMSC Science Data Coordinator
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998