Metadata: Identification_Information: Citation: Citation_Information: Originator: Andrew W. Stevens Originator: Jeffrey M. Wood Originator: Peter R. Ruggiero Originator: Guy R. Gelfenbaum Publication_Date: 20211201 Title: Nearshore bathymetry of the Columbia River littoral cell, Washington and Oregon, 2020 Geospatial_Data_Presentation_Form: comma-delimited text Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9W15JX8 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/P9W15JX8 Online_Linkage: https://www.sciencebase.gov/catalog/item/613b921bd34e40dd9c0f96e4 Larger_Work_Citation: Citation_Information: Originator: Andrew W. Stevens Originator: Heather M. Weiner Originator: Jeffrey M. Wood Originator: Peter R. Ruggiero Originator: George M. Kaminsky Originator: Guy R. Gelfenbaum Publication_Date: 2019 Title: Beach topography and nearshore bathymetry of the Columbia River littoral cell, Washington and Oregon (ver. 3.0, November 2021) Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9W15JX8 Publication_Information: Publication_Place: Santa Cruz, CA Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/P9W15JX8 Description: Abstract: 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. Purpose: 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. 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=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. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20200719 Ending_Date: 20200906 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: -124.2167165 East_Bounding_Coordinate: -123.9530673 North_Bounding_Coordinate: 47.1035382 South_Bounding_Coordinate: 46.1107689 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:613b921bd34e40dd9c0f96e4 Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: bathymetry Theme_Keyword: bathymetry measurement Theme_Keyword: GPS measurement Theme_Keyword: sea-floor characteristics Theme_Keyword: marine geophysics Theme_Keyword: single-beam echo sounder 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: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: Global Positioning System (GPS) observations 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: Pacific Ocean Place_Keyword: Columbia River Place_Keyword: Clatsop County Place_Keyword: Pacific County Place_Keyword: Grays Harbor County 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: PCMSC Science Data Coordinator Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center 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 Native_Data_Set_Environment: MATLAB Version: 9.8.0.1396136 (R2020a) Cross_Reference: Citation_Information: Originator: Richard C. Daniels Originator: Peter Ruggiero Originator: Leonard E. Weber Publication_Date: 1999 Title: Washington Coastal Geodetic Control Network: Report and Station Index Geospatial_Data_Presentation_Form: comma-delimited text Publication_Information: Publication_Place: Olympia, WA Publisher: Washington State Department of Ecology Publication #99-103 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 text 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: No formal attribute accuracy tests were conducted. Logical_Consistency_Report: All data falls 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: 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. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: 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. Lineage: Process_Step: Process_Description: 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. Process_Date: 20200906 Process_Step: Process_Description: 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. Process_Date: 20210322 Process_Step: Process_Description: All available bathymetry data from the survey were compiled into a comma-delimited text file for distribution Process_Date: 20210910 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Point Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 2753332 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.0000001 Longitude_Resolution: 0.0000001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 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 dataset Entity_Type_Definition_Source: Producer defined Attribute: Attribute_Label: area Attribute_Definition: Designation of sub-area within the Columbia River littoral cell survey area Attribute_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Clatsop Enumerated_Domain_Value_Definition: Clatsop sub-area Enumerated_Domain_Value_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Long Beach Enumerated_Domain_Value_Definition: Long Beach sub-area Enumerated_Domain_Value_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Grayland Enumerated_Domain_Value_Definition: Grayland sub-area Enumerated_Domain_Value_Definition_Source: producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: North Beach Enumerated_Domain_Value_Definition: North Beach sub-area Enumerated_Domain_Value_Definition_Source: producer defined Attribute: Attribute_Label: line_number Attribute_Definition: Numeric code identifying the number of the survey line. Data that were not collected along a survey line are labeled "None". Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 001 Range_Domain_Maximum: 224 Attribute: Attribute_Label: datetime_utc Attribute_Definition: The date and time of data collection in Coordinated Universal Time (UTC). Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2020-Jul-19 19:53:28.060 Range_Domain_Maximum: 2020-Sep-06 00:03:30.453 Attribute_Units_of_Measure: date and time in yyyy-mmm-dd HH:MM:SS.FFF format Attribute: Attribute_Label: longitude Attribute_Definition: Longitude coordinate of data point relative to the North American Datum of 1983 Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -124.2167165 Range_Domain_Maximum: -123.9530673 Attribute_Units_of_Measure: Decimal degrees Attribute: Attribute_Label: latitude Attribute_Definition: Latitude coordinate of data point relative to the North American Datum of 1983 Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 46.1107689 Range_Domain_Maximum: 47.1035382 Attribute_Units_of_Measure: Decimal degrees Attribute: Attribute_Label: easting_m Attribute_Definition: East coordinate of data point relative to the North American Datum of 1983, projected in the Washington State Plane South, meters, coordinate system Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 217949.49 Range_Domain_Maximum: 233175.45 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: northing_m Attribute_Definition: North coordinate of data point relative to the North American Datum of 1983, projected in the Washington State Plane South, meters, coordinate system Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 92323.87 Range_Domain_Maximum: 203305.21 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: distance_m Attribute_Definition: 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. Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -3312.11 Range_Domain_Maximum: 46.97 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: offline_m Attribute_Definition: 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. Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -35.48 Range_Domain_Maximum: 39.98 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: ellipsoid_ht_m Attribute_Definition: Height in meters of data point with reference to the reference ellipsoid Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -40.06 Range_Domain_Maximum: -23.40 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: ortho_ht_m Attribute_Definition: Height in meters of data point with reference to the North American Vertical Datum of 1988. Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -16.06 Range_Domain_Maximum: 0.58 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: Bathymetry data are available as a comma-delimited text file (crlc20_bathy.csv), along with 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: comma-delimited text Format_Version_Number: Matlab 9.8.0.1396136 Format_Specification: text Format_Information_Content: comma-delimited text file Transfer_Size: 293.09 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/613b921bd34e40dd9c0f96e4?name=crlc20_bathy.csv Network_Resource_Name: https://www.sciencebase.gov/catalog/item/613b921bd34e40dd9c0f96e4 Network_Resource_Name: https://www.sciencebase.gov/catalog/item/613b91f3d34e40dd9c0f96e2 Network_Resource_Name: https://doi.org/10.5066/P9W15JX8 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: 20211201 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: PCMSC Science Data Coordinator 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 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