Andrew W. Stevens
Jeffrey M. Wood
Peter R. Ruggiero
Guy R. Gelfenbaum
20211201
Nearshore bathymetry of the Columbia River littoral cell, Washington and Oregon, 2020
comma-delimited text
data release
DOI:10.5066/P9W15JX8
Pacific Coastal and Marine Science Center, Santa Cruz, California
U.S. Geological Survey
https://doi.org/10.5066/P9W15JX8
https://www.sciencebase.gov/catalog/item/613b921bd34e40dd9c0f96e4
Andrew W. Stevens
Heather M. Weiner
Jeffrey M. Wood
Peter R. Ruggiero
George M. Kaminsky
Guy R. Gelfenbaum
2019
Beach topography and nearshore bathymetry of the Columbia River littoral cell, Washington and Oregon (ver. 3.0, November 2021)
data release
DOI:10.5066/P9W15JX8
Santa Cruz, CA
U.S. Geological Survey
https://doi.org/10.5066/P9W15JX8
This portion of the USGS data release presents bathymetry data collected during surveys performed in the Columbia River littoral cell, Washington and Oregon, in 2020 (USGS Field Activity Number 2020-622-FA). Bathymetry data were collected using four personal watercraft (PWCs) equipped with single-beam sonar systems and global navigation satellite system (GNSS) receivers. The sonar systems consisted of an Odom Echotrac CV-100 single-beam echosounder and 200 kHz transducer with a 9-degree beam angle. Raw acoustic backscatter returns were digitized by the echosounder with a vertical resolution of 1.25 cm. Depths from the echosounders were computed using sound velocity profiles measured using a YSI CastAway CTD during the survey. Positioning of the survey vessels was determined at 5 to 10 Hz using Trimble R7 GNSS receivers. Output from the GNSS receivers and sonar systems were combined in real time on the PWC by a computer running HYPACK hydrographic survey software. Navigation information was displayed on a video monitor, allowing PWC operators to navigate along survey lines at speeds of 2 to 3 m/s. Survey-grade positions of the PWCs were achieved with a single-base station and differential post-processing. Positioning data from the GNSS receivers were post-processed using Waypoint Grafnav to apply differential corrections from a GNSS base station with known horizontal and vertical coordinates relative to the North American Datum of 1983. Orthometric elevations relative to the NAVD88 vertical datum were computed using National Geodetic Survey Geoid12a offsets. Bathymetric data were merged with post-processed positioning data and spurious soundings were removed using a custom Graphical User Interface (GUI) programmed with the computer program MATLAB. The average estimated vertical uncertainty of the bathymetric measurements is 10 cm. The final point data from the PWCs are provided in a comma-separated text file and are projected in cartesian coordinates using the Washington State Plane South, meters coordinate system. Due to equipment and staffing issues associated with the global pandemic, bathymetric surveys performed at the southern portion of the Clatsop Plains sub-cell (survey lines 71 to 101) and North Beach sub-cell were performed several weeks after the corresponding topographic surveys. The CTD was not available for bathymetric surveys at these locations and an assumed speed of sound of 1,500 and 1,490 m/s was applied to soundings collected in the North Beach sub-cell and southern portion of the Clatsop sub-cell, respectively.
Data were obtained to document interannual changes in shoreline position and coastal morphology. 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.
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=2020-622-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
20200719
20200906
ground condition at time data were collected
Not planned
-124.2167165
-123.9530673
47.1035382
46.1107689
USGS Metadata Identifier
USGS:613b921bd34e40dd9c0f96e4
USGS Thesaurus
bathymetry
bathymetry measurement
GPS measurement
sea-floor characteristics
marine geophysics
single-beam echo sounder
ISO 19115 Topic Category
elevation
Data Categories for Marine Planning
Bathymetry and Elevation
Marine Realms Information Bank (MRIB) keywords
Global Positioning System (GPS) observations
Global Change Master Directory (GCMD)
Water Depth
GPS (Global Positioning System)
Echo Sounders
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)
Pacific Ocean
Columbia River
Clatsop County
Pacific County
Grays Harbor County
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 originator(s) of the dataset and in products derived from these data. This information is not intended for navigational purposes.
PCMSC Science Data Coordinator
U.S. Geological Survey, Pacific Coastal and Marine Science Center
mailing and physical
2885 Mission Street
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
MATLAB Version: 9.8.0.1396136 (R2020a)
Richard C. Daniels
Peter Ruggiero
Leonard E. Weber
1999
Washington Coastal Geodetic Control Network: Report and Station Index
comma-delimited text
Olympia, WA
Washington State Department of Ecology Publication #99-103
International Hydrographic Organization (IHO)
2008
IHO standards for hydrographic surveys (5th ed.)
comma-delimited text
Monaco
International Hydrographic Bureau Special Publication 44, 28p.
https://www.iho.int/iho_pubs/standard/S-44_5E.pdf
No formal attribute accuracy tests were conducted.
All data falls within expected ranges.
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.
Survey-grade positions of the personal watercraft (PWCs) were achieved with global navigation satellite system (GNSS) receivers and a single GNSS base station placed on a benchmark with published horizontal coordinates relative to the North American Datum of 1983 (Daniels and others, 1999). The horizontal positions of the geodetic reference network meet first-order specifications established by the National Geodetic Survey with a horizontal accuracy of 2 cm or better. Positioning data from the PWCs were post-processed using Waypoint Grafnav software to apply differential corrections from the GNSS base station. Manufacturer reported accuracy for the differentially corrected horizontal positions for the GNSS rover trajectories is 0.8 cm + 0.5 ppm. Baselines from the GNSS base station varied between 300 m and 12 km with a mean of 3.5 km, suggesting the average horizontal accuracy of survey vessel positions to be about 1 cm. Combining the uncertainty in the benchmark and watercraft yields a total uncertainty of 3 cm. Uncertainty in the horizontal positions associated with pitch and roll of the survey vessels is unknown.
Uncertainty in the final elevations is derived from the combination of uncertainty in the GNSS positioning and bathymetric sounding measurements. The vertical positions of the geodetic reference network meet 2 cm local ellipsoid height specifications established by the National Geodetic Survey (Daniels and others, 1999). Manufacturer reported accuracy for the differentially corrected vertical positions for the GNSS rover trajectories is 1.5 cm + 1 ppm relative to the benchmark elevation. Baselines from the GNSS base station varied between 300 m and 12 km with a mean of 3.2 km, suggesting the average vertical accuracy of survey vessel positions to be about 1.8 cm. The manufacturer of the single-beam echosounder used in this study reports a vertical accuracy of 1 cm. Additional uncertainty in the final computed elevations data is related to unmeasured variability in the speed of sound used to compute depths from bathymetric soundings and, thus, is depth-dependent. Based on analysis of available speed of sound measurements, we estimate uncertainties in the final depth soundings to be no greater than 1 percent of the water depth. The total vertical uncertainty is calculated using the constant- and depth-dependent factors summed in quadrature (International Hydrographic Organization, 2008). The vertical uncertainty in final elevations varied between 3 cm and 19 cm with a mean vertical uncertainty of 10 cm. Uncertainty in the vertical positions associated with pitch and roll of the survey vessels is unknown.
Bathymetry data were collected between July 19 and September 6, 2020, using four single-beam sonar systems and global navigation satellite systems (GNSS) receivers mounted on personal watercraft (PWC). The sonar systems consisted of an Odom Echotrac CV-100 single-beam echosounder and 200 kHz transducer with a 9-degree beam angle. Raw acoustic backscatter returns were digitized by the echosounder with a vertical resolution of 1.25 cm. Depths from the echosounders were computed using sound velocity profiles measured using a YSI CastAway CTD during the survey. Positioning of the survey vessels was determined at 5 to 10 Hz using survey-grade GNSS receivers. Output from the GNSS receivers and sonar systems were combined in real time on the PWC by a computer running HYPACK hydrographic survey software. Navigation information was displayed on a video monitor, allowing PWC operators to navigate along survey lines at speeds of 2 to 3 m/s. Due to equipment and staffing issues associated with the global pandemic, bathymetric surveys performed at the southern portion of the Clatsop Plains sub-cell (lines 71 to 101) and North Beach sub-cell were performed several weeks after the corresponding topographic surveys. The CTD was not available for bathymetric surveys at these locations and an assumed speed of sound of 1,500 and 1,490 m/s was applied to soundings collected in the North Beach sub-cell and southern portion of the Clatsop sub-cell, respectively.
20200906
Survey-grade positions of the PWCs were achieved with a single-base station and differential post-processing. Positioning data from the GNSS receivers were post-processed using Waypoint Grafnav to apply differential corrections from a GNSS base station with known horizontal and vertical coordinates relative to the North American Datum of 1983. Orthometric elevations relative to the NAVD88 vertical datum were computed using National Geodetic Survey Geoid12a offsets. Bathymetric data were merged with post-processed positioning data and spurious soundings were removed using a custom Graphical User Interface (GUI) programmed with the computer program MATLAB. The final point data from the PWCs are projected in cartesian coordinates using the Washington State Plane South, meters coordinate system.
20210322
All available bathymetry data from the survey were compiled into a comma-delimited text file for distribution
20210910
Point
Point
2753332
0.0000001
0.0000001
Decimal degrees
North American Datum of 1983
GRS_1980
6378137.0
298.257222101
North American Vertical Datum of 1988
0.01
meters
Explicit elevation coordinate included with horizontal coordinates
Attribute Table
Table containing attribute information associated with the dataset
Producer defined
area
Designation of sub-area within the Columbia River littoral cell survey area
producer defined
Clatsop
Clatsop sub-area
producer defined
Long Beach
Long Beach sub-area
producer defined
Grayland
Grayland sub-area
producer defined
North Beach
North Beach sub-area
producer defined
line_number
Numeric code identifying the number of the survey line. Data that were not collected along a survey line are labeled "None".
Producer defined
001
224
datetime_utc
The date and time of data collection in Coordinated Universal Time (UTC).
Producer Defined
2020-Jul-19 19:53:28.060
2020-Sep-06 00:03:30.453
date and time in yyyy-mmm-dd HH:MM:SS.FFF format
longitude
Longitude coordinate of data point relative to the North American Datum of 1983
Producer defined
-124.2167165
-123.9530673
Decimal degrees
latitude
Latitude coordinate of data point relative to the North American Datum of 1983
Producer defined
46.1107689
47.1035382
Decimal degrees
easting_m
East coordinate of data point relative to the North American Datum of 1983, projected in the Washington State Plane South, meters, coordinate system
Producer defined
217949.49
233175.45
meters
northing_m
North coordinate of data point relative to the North American Datum of 1983, projected in the Washington State Plane South, meters, coordinate system
Producer defined
92323.87
203305.21
meters
distance_m
Distance from reference point along planned survey line. Distances are relative to an arbitrary reference point. Depending on the orientation of the target line and position of the reference point, the along-line distance can be positive or negative in any direction. NaN=not a number, because the data were not collected along a pre-defined survey line.
Producer defined
-3312.11
46.97
meters
offline_m
Horizontal distance from planned survey line. Depending on the orientation of the target line and position of the reference point, the offline distance can be positive or negative in any direction. NaN=not a number, because the data were not collected along a pre-defined survey line.
Producer defined
-35.48
39.98
meters
ellipsoid_ht_m
Height in meters of data point with reference to the reference ellipsoid
Producer defined
-40.06
-23.40
meters
ortho_ht_m
Height in meters of data point with reference to the North American Vertical Datum of 1988.
Producer defined
-16.06
0.58
meters
U.S. Geological Survey - Science Base
U.S. Geological Survey
mailing and physical
Denver Federal Center, Building 810, Mail Stop 302
Denver
CO
80225
USA
1-888-275-8747
sciencebase@usgs.gov
Bathymetry data are available as a comma-delimited text file (crlc20_bathy.csv), along with associated 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.
comma-delimited text
Matlab 9.8.0.1396136
text
comma-delimited text file
293.09
https://www.sciencebase.gov/catalog/file/get/613b921bd34e40dd9c0f96e4?name=crlc20_bathy.csv
https://www.sciencebase.gov/catalog/item/613b921bd34e40dd9c0f96e4
https://www.sciencebase.gov/catalog/item/613b91f3d34e40dd9c0f96e2
https://doi.org/10.5066/P9W15JX8
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.
None
20211201
PCMSC Science Data Coordinator
U.S. Geological Survey, Pacific Coastal and Marine Science Center
mailing and physical
2885 Mission St.
Santa Cruz
CA
95060
831-427-4747
pcmsc_data@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998