Metadata: Identification_Information: Citation: Citation_Information: Originator: Andrew W. Stevens Originator: Guy Gelfenbaum Originator: Jamie MacMahan Originator: Ad J.H.M. Reniers Originator: Edwin P. Elias Originator: Christopher R. Sherwood Originator: Emily M. Carlson Publication_Date: 2017 Title: Water column acoustic backscatter data from the mouth of the Columbia River, Oregon and Washington, 2013 Geospatial_Data_Presentation_Form: NetCDF files Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/F7NG4NS1 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/F7NG4NS1 Online_Linkage: https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba Larger_Work_Citation: Citation_Information: Originator: Andrew W. Stevens Originator: Guy Gelfenbaum Originator: Jamie MacMahan Originator: Ad J.H.M. Reniers Originator: Edwin P. Elias Originator: Christopher R. Sherwood Originator: Emily M. Carlson Publication_Date: 2017 Title: Oceanographic measurements and hydrodynamic modeling of the mouth of the Columbia River, Oregon and Washington, 2013 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/F7NG4NS1 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/F7NG4NS1 Description: Abstract: Spatial surveys of water column acoustic backscatter were performed between May 28 and June 2, 2013, in the mouth of the Columbia River, Oregon and Washington. These data were collected using a Biosonics DTX single-beam echosounder with 430 kHz transducer. Purpose: These water column acoustic backscatter data were collected as a part of a larger investigation into hydrodynamics in the mouth of the Columbia River, Oregon and Washington. Supplemental_Information: Information about the data collection field activities can be found at: https://cmgds.marine.usgs.gov/fan_info.php?fan=S0313WO Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20130528 Ending_Date: 20130602 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: -124.029598 East_Bounding_Coordinate: -123.987173 North_Bounding_Coordinate: 46.267905 South_Bounding_Coordinate: 46.238508 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:590b751ce4b0e541a0378cba Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: Water Column Features Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: marine water quality Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: physical oceanography Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: Pacific Coastal and Marine Science Center Theme_Keyword: PCMSC Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: Oceans Theme_Keyword: geoscientificInformation Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Columbia River Place_Keyword: Pacific County Place_Keyword: Clatsop County Place_Keyword: State of Washington Place_Keyword: State of Oregon 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. 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_Position: Oceanographer Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060-5792 Country: USA Contact_Voice_Telephone: 831-460-7424 Contact_Facsimile_Telephone: 831-427-4748 Contact_Electronic_Mail_Address: astevens@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_biosonics_map.png&allowOpen=true Browse_Graphic_File_Description: Map showing locations of survey transects Browse_Graphic_File_Type: PNG Browse_Graphic: Browse_Graphic_File_Name: https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_biosonics_ex.png&allowOpen=true Browse_Graphic_File_Description: Image showing water column backscatter data from one of the transects surveyed at three different stages of the tide cycle 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: PDF 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: 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 metadata for each part of this data release carefully for additional details. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Manufacturer reported accuracy for the differentially corrected horizontal positions for the Trimble R7 rover trajectories 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. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Manufacturer reported accuracy for the differentially corrected vertical positions for the Trimble R7 rover trajectories is 1.5 cm + 1 ppm. Baselines from the GNSS base station were typically less than 5 km, suggesting the vertical accuracy of survey vessel positions to be 2 cm relative to the base station coordinate. 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, are depth-dependent. Based on analysis of all available speed of sound measurements, we estimate uncertainties in the final depth soundings to be 1 percent of the water depth. The total vertical uncertainty is calculated using Equation 1: sigmat=sqrt(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 (0.01), and d is water depth (International Hydrographic Organization, 2008). Maximum water depths surveyed on this mapping mission are approximately 35 m yielding a maximum total vertical uncertainty of 37 cm. Uncertainty in the vertical positions associated with pitch and roll of the survey vessels is unknown. Lineage: Process_Step: Process_Description: A total of 62 km of tracklines were surveyed with a Biosonics single-beam echosounder in the mouth of the Columbia River (MCR) between May 28 and June 2, 2013. Several cross-channel transects were surveyed repeatedly to characterize changes in water column acoustic backscatter amplitude at different stages of the tide cycle. Measurements of acoustic backscatter amplitude in the water column were collected using a Biosonics single-beam echosounder with a 430 kHz transducer pole-mounted to the R/V Park Snavely. A Trimble R7 global navigation satellite system (GNSS) receiver and Trimble Zephyr Model 2 GNSS antenna was used to provide positioning during the surveys. Real-time differential corrections from the Washington State Reference Network (http://www.wsrn3.org/) were applied to achieve survey-grade horizontal and vertical GNSS positions while the vessel was underway. Biosonics Visual Acquisition software (version 6.1.0.7382) was used for data acquisition and merging of the acoustic and positioning data. Raw backscatter data from each ping were digitized with an analog to digital converter in the echosounder at a rate of 41667 Hz, resulting in a profile of acoustic backscatter counts versus depth at intervals of 1.8 cm. Raw counts of acoustic backscatter were converted to target strength assuming a seawater absorption coefficient of 0.085 dB/m, a source level of 216 dB re 1 microPa m, and receiver sensitivity of -61.4 dB/count derived from calibrations performed in a test tank by the manufacturer. Process_Date: 20130602 Process_Step: Process_Description: Data were accumulated into NetCDF files. Process_Date: 20160114 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 Spatial_Data_Organization_Information: Indirect_Spatial_Reference: Data were collected continuously along survey transects. Refer to self-contained NetCDF files for more location information. Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000001 Longitude_Resolution: 0.000001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257223563 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: NetCDF files are self-contained and attribute information may be found in the header of the file itself. Entity_and_Attribute_Detail_Citation: The entity and attribute information was generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - ScienceBase Contact_Address: Address_Type: Mailing and Physical Address 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: Downloadable data in NetCDF format. NetCDF were compressed in zip files (e.g. mcr13_XXXX..., where XXXX is the MMDD) for each day of survey operations. 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: NetCDF Format_Version_Number: Matlab 9.0.0.341360 Format_Information_Content: Zip file contains vessel-mounted ADCP data in NetCDF format for data collected on May 29, 2013 File_Decompression_Technique: zip archive Transfer_Size: 342.03 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_0529_backscatter.zip Network_Resource_Name: https://doi.org/10.5066/F7NG4NS1 Access_Instructions: Data may be accessed and downloaded via the Internet Digital_Form: Digital_Transfer_Information: Format_Name: NetCDF Format_Version_Number: Matlab 9.0.0.341360 Format_Information_Content: Zip file contains vessel-mounted ADCP data in NetCDF format for data collected on June 2, 2013 File_Decompression_Technique: zip archive Transfer_Size: 447.51 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_0602_backscatter.zip Network_Resource_Name: https://doi.org/10.5066/F7NG4NS1 Access_Instructions: Data may be accessed and downloaded via the Internet Digital_Form: Digital_Transfer_Information: Format_Name: NetCDF Format_Version_Number: Matlab 9.0.0.341360 Format_Information_Content: Zip file contains vessel-mounted ADCP data in NetCDF format for data collected on May 28, 2013 File_Decompression_Technique: zip archive Transfer_Size: 671.56 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_0528_backscatter.zip Network_Resource_Name: https://doi.org/10.5066/F7NG4NS1 Access_Instructions: Data may be accessed and downloaded via the Internet Digital_Form: Digital_Transfer_Information: Format_Name: NetCDF Format_Version_Number: Matlab 9.0.0.341360 Format_Information_Content: Zip file contains vessel-mounted ADCP data in NetCDF format for data collected on May 31, 2013 File_Decompression_Technique: zip archive Transfer_Size: 715.66 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_0531_backscatter.zip Network_Resource_Name: https://doi.org/10.5066/F7NG4NS1 Access_Instructions: Data may be accessed and downloaded via the Internet Digital_Form: Digital_Transfer_Information: Format_Name: NetCDF Format_Version_Number: Matlab 9.0.0.341360 Format_Information_Content: Zip file contains vessel-mounted ADCP data in NetCDF format for data collected on June 1, 2013 File_Decompression_Technique: zip archive Transfer_Size: 1480.0 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_0601_backscatter.zip Network_Resource_Name: https://doi.org/10.5066/F7NG4NS1 Access_Instructions: Data may be accessed and downloaded via the Internet Digital_Form: Digital_Transfer_Information: Format_Name: png Format_Version_Number: Matlab 9.0.0.341360 Format_Information_Content: PNG image showing example of water column acoustic backscatter data at various stages throughout the tide cycle File_Decompression_Technique: none Transfer_Size: 1.59 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_backscatter_ex.png Network_Resource_Name: https://doi.org/10.5066/F7NG4NS1 Access_Instructions: Data may be accessed and downloaded via the Internet Digital_Form: Digital_Transfer_Information: Format_Name: png Format_Version_Number: Matlab 9.0.0.341360 Format_Information_Content: PNG image showing locations of water column acoustic backscatter data File_Decompression_Technique: none Transfer_Size: 1.88 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/590b751ce4b0e541a0378cba?name=mcr13_backscatter_map.png Network_Resource_Name: https://doi.org/10.5066/F7NG4NS1 Access_Instructions: Data may be accessed and downloaded via the Internet Fees: None Metadata_Reference_Information: Metadata_Date: 20201019 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Andrew W. Stevens Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Country: USA Contact_Voice_Telephone: 831-460-7424 Contact_Facsimile_Telephone: 831-427-4748 Contact_Electronic_Mail_Address: astevens@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998