Metadata: Identification_Information: Citation: Citation_Information: Originator: Andrew W. Stevens Publication_Date: 20230808 Title: Surface sediment grain size distributions derived from manual point counts of in situ seafloor images from the lower Columbia River, Washington and Oregon, 2021 Geospatial_Data_Presentation_Form: comma-delimited text Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/10.5066/P92U1KPY 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/P92U1KPY Larger_Work_Citation: Citation_Information: Originator: Andrew W. Stevens Originator: Gerald A. Hatcher Originator: Peter Dal Ferro Originator: Peter Dartnell Originator: Jonathan A. Warrick Originator: Nicholas Cohn Originator: Hans R. Moritz Publication_Date: 2023 Title: Digital seafloor images, sediment grain size, bathymetry, and water velocity data from the lower Columbia River, Washington and Oregon, 2021 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P92U1KPY Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA Publisher: U.S. Geological Survey Other_Citation_Details: Suggested Citation: Suggested Citation: Stevens, A.W., Hatcher, G.A., Dal Ferro, P., Warrick, J.A., Cohn, N., and Moritz, H.R., 2023, Digital seafloor images, sediment grain size, bathymetry, and water velocity data from the lower Columbia River, Washington and Oregon, 2021: U.S. Geological Survey data release, https://doi.org/10.5066/P92U1KPY. Online_Linkage: https://doi.org/10.5066/P92U1KPY Description: Abstract: This dataset contains surface sediment grain size distributions derived from manual point counts of in situ seafloor images obtained with an underwater camera system in the lower Columbia River, Washington and Oregon, in 2021. The distributions derived from manual point counts were compared with results from an automated image processing technique to calibrate and validate the automated method used to quantify surface sediment grain size distributions in objective images. The surface sediment grain size distribution data derived from manual point counts are provided in comma-separated text format (point_count_distributions.csv) and should be compared with grain size distributions for the same set of images (dgs_calibration_validation.csv) derived from automated image processing that can be found in the "Surface sediment grain size distributions derived from automated image processing of in situ seafloor images from the lower Columbia River, Washington and Oregon, 2021" portion of the overall data release. Purpose: Growth of subaqueous sand dunes commonly causes shoaling in engineered river channels that necessitates costly dredging to maintain adequate depths for navigation. The factors that result in sand wave growth are theoretically understood from laboratory experiments, but the capacity to predict sand wave geometries in field settings is limited due to temporal and spatial variability in hydrodynamics and sediment grain size. Detailed measurements of sand wave geometries, hydrodynamics, and grain size are therefore needed to test and improve numerical models and inform efficient management strategies in navigation channels. This data release presents surface sediment grain size distributions, bathymetry and seafloor acoustic backscatter, and water velocity data acquired at four sites with subaqueous sand dunes in the lower Columbia River, Washington and Oregon, between June 4 and June 9, 2021. The four sites were located between 65 km and 127 km upstream from the ocean inlet along a gradient of relative tidal and fluvial influence. The survey was performed during peak annual river discharge when sediment transport processes were likely active. High resolution digital images were collected at each site with an underwater camera system that was repeatedly lowered to the seabed along a series of 1 km-long transects oriented along the main navigation channel and spaced about 60 m apart. The grain size distributions of the seabed images were estimated using an automated image processing technique and tested with observed grain size distributions derived from manual measurements on a subset of 16 images. Swath bathymetry and seafloor acoustic backscatter data were collected repeatedly at each site using a 234.5 kHz phase-differencing sidescan sonar to characterize sand wave geometry and bathymetric change resulting from sand wave migration. Current velocity data were collected from an underway survey vessel equipped with a downward looking 600 kHz ADCP along transects oriented both along- and across the main navigation channel. Combined, these data provide a comprehensive characterization of mobile subaqueous sand dunes that can be used to improve predictions of dune growth in complicated field settings and inform efficient sediment management practices in the lower Columbia River. Supplemental_Information: Additional information about the field activity or activities from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-621-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: 20210605 Ending_Date: 20210608 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: -123.439024 East_Bounding_Coordinate: -122.764815 North_Bounding_Coordinate: 46.248515 South_Bounding_Coordinate: 45.713588 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:f479b5c2-d175-4d29-9847-f225b5033aa0 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: Substrate Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: ocean processes Theme_Keyword: sediment transport Theme_Keyword: grain-size analysis Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: sediment Theme_Keyword: Global Positioning System (GPS) observations 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: Columbia River 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_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 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: dgs_point_count_quantile_comparison.png Browse_Graphic_File_Description: Comparisons and error metrics for quantiles describing cumulative grain size distributions (D16, D25, D50, D75, D84, D90) derived from manual point counts (measured) and automated image processing techniques (estimated) for calibration and validation image sets. Browse_Graphic_File_Type: PNG Native_Data_Set_Environment: MATLAB Version: 9.13.0.2080170 (R2022b) Update 1 Cross_Reference: Citation_Information: Originator: Jonathan A. Warrick Originator: David M. Rubin Originator: Peter Ruggiero Originator: Jodi N. Harney Originator: Amy E. Draut Originator: Daniel Buscombe Publication_Date: 2009 Title: Cobble cam: grain-size measurements of sand to boulder from digital photographs and autocorrelation analyses Other_Citation_Details: Warrick, J.A., Rubin, D.M., Ruggiero, P., Harney, J.N., Draut, A.E., and Buscombe, D., 2009, Cobble cam: grain-size measurements of sand to boulder from digital photographs and autocorrelation analyses, Earth Surface Processes and Landforms, v. 34, pp. 1811-1821. Online_Linkage: https://doi.org/10.1002/esp.1877 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: No formal attribute accuracy tests were conducted. Logical_Consistency_Report: No formal logical accuracy tests were conducted. 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: The locations of each seafloor image collected were determined using an Applanix POSMV Wavemaster operating in DGNSS mode. Manufacturer reported accuracy of the horizontal positions while operating in DGNSS mode is between 0.5 and 2 m depending on the quality of the DGNSS corrections received (https://www.applanix.com/downloads/products/specs/posmv/POS-MV-WaveMaster-II.pdf). Additional uncertainty in the horizontal positions of the images due to instrument layback, or non-vertical wire angle between surface vessel and camera at the seafloor, is unknown but assumed to be minimal because of the weight of the camera and slow speed of the vessel relative to the ambient currents during image acquisition. Lineage: Process_Step: Process_Description: High resolution spatial surveys were performed between June 5 and 8, 2021 to quantify surface sediment grain size distributions of mobile subaqueous dunes at four sites in the lower Columbia River, Washington and Oregon. At each site, digital images of the sediment surface were collected with an underwater camera system that was repeatedly lowered to the seabed along a series of 1 km-long transects oriented along the main navigation channel and spaced about 60 m apart. The camera consisted of a FLIR Blackfly BFS-PGE-50S5 camera and 50 mm lens in a waterproof housing that resulted in a field of view of approximately 17 mm and a resolution of 0.00657 mm per pixel when the housing window was flush with the sediment surface. An ethernet cable between the survey vessel and camera provided power to the camera and allowed for real-time viewing of the seafloor imagery on a computer during acquisition. The locations of each seafloor image collected were determined using an Applanix POSMV Wavemaster global navigation satellite system receiver operating in DGNSS mode. Process_Date: 20210608 Process_Step: Process_Description: A subset of 15 calibration images and 16 validation images were identified from the overall data set. Manual point counts were performed on both calibration and validation images by manually measuring the long and short axis of 100 grains in the images following methods described in Warrick and others (2009). Grain size statistics including quantiles describing the cumulative grain size distributions (finer than convention) as well as arithmetic moments (mean, sorting, skewness, and kurtosis) were calculated based on the average distribution of long and short axis grain size measurements. Process_Date: 20230420 Process_Step: Process_Description: The grain size distributions derived from manual point counts of the calibration and validation image sets were compiled into a comma-separated text files for distribution. Process_Date: 20230503 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: 31 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: WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257223563 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: image_group Attribute_Definition: Classification of group of images Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Calibration Enumerated_Domain_Value_Definition: Images used for image processing technique calibration Enumerated_Domain_Value_Definition_Source: Producer defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Validation Enumerated_Domain_Value_Definition: Image used for image processing technique validation Enumerated_Domain_Value_Definition_Source: Producer defined Attribute: Attribute_Label: image_filename Attribute_Definition: Filename of image collected Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Unrepresentable_Domain: Unique identifier for the image assigned in the field. Attribute: Attribute_Label: datetime_utc Attribute_Definition: Date and time of image collection in yyyy-mm-dd HH:MM:SS.FFF format Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 2021-06-05 20:46:36.270 Range_Domain_Maximum: 2021-06-08 18:51:38.700 Attribute_Units_of_Measure: Dates in yyyy-mm-dd HH:MM:SS.FFF format Attribute: Attribute_Label: longitude Attribute_Definition: Longitude of image in decimal degrees, east. NaN=not a number, because no location of the sample is available. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -123.439024 Range_Domain_Maximum: -122.764815 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: latitude Attribute_Definition: Latitude of image in decimal degrees, north. NaN=not a number, because no location of the sample is available. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 45.713588 Range_Domain_Maximum: 46.248515 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: pixel_size_mm Attribute_Definition: Size of pixels in image in millimeters Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00657 Range_Domain_Maximum: 0.00657 Attribute_Units_of_Measure: millimeters Attribute: Attribute_Label: 0.0078_mm Attribute_Definition: Fraction of sample with grain diameter in 0.0078 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.0093_mm Attribute_Definition: Fraction of sample with grain diameter in 0.0093 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.0111_mm Attribute_Definition: Fraction of sample with grain diameter in 0.0111 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.0131_mm Attribute_Definition: Fraction of sample with grain diameter in 0.0131 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.0156_mm Attribute_Definition: Fraction of sample with grain diameter in 0.0156 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.0186_mm Attribute_Definition: Fraction of sample with grain diameter in 0.0186 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.0221_mm Attribute_Definition: Fraction of sample with grain diameter in 0.0221 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.0263_mm Attribute_Definition: Fraction of sample with grain diameter in 0.0263 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.0312_mm Attribute_Definition: Fraction of sample with grain diameter in 0.0312 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.0372_mm Attribute_Definition: Fraction of sample with grain diameter in 0.0372 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.0442_mm Attribute_Definition: Fraction of sample with grain diameter in 0.0442 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.0526_mm Attribute_Definition: Fraction of sample with grain diameter in 0.0526 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.0625_mm Attribute_Definition: Fraction of sample with grain diameter in 0.0625 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.0743_mm Attribute_Definition: Fraction of sample with grain diameter in 0.0743 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.0884_mm Attribute_Definition: Fraction of sample with grain diameter in 0.0884 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.1051_mm Attribute_Definition: Fraction of sample with grain diameter in 0.1051 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.1250_mm Attribute_Definition: Fraction of sample with grain diameter in 0.1250 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.1487_mm Attribute_Definition: Fraction of sample with grain diameter in 0.1487 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.1768_mm Attribute_Definition: Fraction of sample with grain diameter in 0.1768 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.2102_mm Attribute_Definition: Fraction of sample with grain diameter in 0.2102 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.2500_mm Attribute_Definition: Fraction of sample with grain diameter in 0.2500 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.2973_mm Attribute_Definition: Fraction of sample with grain diameter in 0.2973 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.3536_mm Attribute_Definition: Fraction of sample with grain diameter in 0.3536 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.4204_mm Attribute_Definition: Fraction of sample with grain diameter in 0.4204 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.5000_mm Attribute_Definition: Fraction of sample with grain diameter in 0.5000 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.5946_mm Attribute_Definition: Fraction of sample with grain diameter in 0.5946 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.7071_mm Attribute_Definition: Fraction of sample with grain diameter in 0.7071 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 0.8409_mm Attribute_Definition: Fraction of sample with grain diameter in 0.8409 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 1.0000_mm Attribute_Definition: Fraction of sample with grain diameter in 1.0000 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 1.1890_mm Attribute_Definition: Fraction of sample with grain diameter in 1.1890 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 1.4140_mm Attribute_Definition: Fraction of sample with grain diameter in 1.4140 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 1.6820_mm Attribute_Definition: Fraction of sample with grain diameter in 1.6820 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 2.0000_mm Attribute_Definition: Fraction of sample with grain diameter in 2.0000 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 2.3780_mm Attribute_Definition: Fraction of sample with grain diameter in 2.3780 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 2.8280_mm Attribute_Definition: Fraction of sample with grain diameter in 2.8280 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 3.3640_mm Attribute_Definition: Fraction of sample with grain diameter in 3.3640 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 4.0000_mm Attribute_Definition: Fraction of sample with grain diameter in 4.0000 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 4.7570_mm Attribute_Definition: Fraction of sample with grain diameter in 4.7570 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: 5.6570_mm Attribute_Definition: Fraction of sample with grain diameter in 5.6570 mm bin. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.00 Attribute_Units_of_Measure: fraction Attribute: Attribute_Label: gs_mean Attribute_Definition: Arithmetic measure of mean grain size. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.314 Range_Domain_Maximum: 1.314 Attribute_Units_of_Measure: millimeters Attribute: Attribute_Label: gs_sorting Attribute_Definition: Arithmetic measure of grain size sorting. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.097 Range_Domain_Maximum: 0.812 Attribute_Units_of_Measure: millimeters Attribute: Attribute_Label: gs_skewness Attribute_Definition: Arithmetic measure of grain size skewness. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.628 Range_Domain_Maximum: 3.123 Attribute_Units_of_Measure: millimeters Attribute: Attribute_Label: gs_kurtosis Attribute_Definition: Arithmetic measure of grain size kurtosis. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3.668 Range_Domain_Maximum: 15.472 Attribute_Units_of_Measure: millimeters Attribute: Attribute_Label: d5_mm Attribute_Definition: Grain diameter whereby 5 percent of the cumulative percent of grains are finer than. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.149 Range_Domain_Maximum: 0.602 Attribute_Units_of_Measure: millimeters Attribute: Attribute_Label: d10_mm Attribute_Definition: Grain diameter whereby 10 percent of the cumulative percent of grains are finer than. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.177 Range_Domain_Maximum: 0.688 Attribute_Units_of_Measure: millimeters Attribute: Attribute_Label: d16_mm Attribute_Definition: Grain diameter whereby 16 percent of the cumulative percent of grains are finer than. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.198 Range_Domain_Maximum: 0.817 Attribute_Units_of_Measure: millimeters Attribute: Attribute_Label: d25_mm Attribute_Definition: Grain diameter whereby 25 percent of the cumulative percent of grains are finer than. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.223 Range_Domain_Maximum: 0.923 Attribute_Units_of_Measure: millimeters Attribute: Attribute_Label: d30_mm Attribute_Definition: Grain diameter whereby 30 percent of the cumulative percent of grains are finer than. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.236 Range_Domain_Maximum: 0.974 Attribute_Units_of_Measure: millimeters Attribute: Attribute_Label: d50_mm Attribute_Definition: Grain diameter whereby 50 percent of the cumulative percent of grains are finer than. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.291 Range_Domain_Maximum: 1.224 Attribute_Units_of_Measure: millimeters Attribute: Attribute_Label: d75_mm Attribute_Definition: Grain diameter whereby 75 percent of the cumulative percent of grains are finer than. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.368 Range_Domain_Maximum: 1.577 Attribute_Units_of_Measure: millimeters Attribute: Attribute_Label: d84_mm Attribute_Definition: Grain diameter whereby 84 percent of the cumulative percent of grains are finer than. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.404 Range_Domain_Maximum: 1.813 Attribute_Units_of_Measure: millimeters Attribute: Attribute_Label: d90_mm Attribute_Definition: Grain diameter whereby 90 percent of the cumulative percent of grains are finer than. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.442 Range_Domain_Maximum: 2.138 Attribute_Units_of_Measure: millimeters Attribute: Attribute_Label: d95_mm Attribute_Definition: Grain diameter whereby 95 percent of the cumulative percent of grains are finer than. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.493 Range_Domain_Maximum: 2.828 Attribute_Units_of_Measure: millimeters Overview_Description: Entity_and_Attribute_Overview: The first line of the csv file is a header line. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - CMGDS Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 1-831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Resource_Description: These data are available in csv format accompanied by CSDGM 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 Version: 9.13.0.2080170 (R2022b) Format_Information_Content: csv table containing surface sediment grain size distributions derived from manual point counts of images File_Decompression_Technique: No compression applied Transfer_Size: 0.012 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P92U1KPY Access_Instructions: Data and metadata can be downloaded using the Network_Resource_Name link and scrolling down to the Sediment Properties Data section. Fees: None. Metadata_Reference_Information: Metadata_Date: 20230808 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 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