Metadata: Identification_Information: Citation: Citation_Information: Originator: Peter Dartnell Originator: James E. Conrad Originator: Janet T. Watt Originator: Jenna C. Hill Publication_Date: 20210823 Title: Composite multibeam bathymetry surface of the southern Cascadia Margin offshore Oregon and northern California Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9C5DBMR 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/P9C5DBMR Larger_Work_Citation: Citation_Information: Originator: Peter Dartnell Originator: James E. Conrad Originator: Janet T. Watt Originator: Jenna C. Hill Publication_Date: 2021 Title: Composite multibeam bathymetry surface and data sources of the southern Cascadia Margin offshore Oregon and northern California Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9C5DBMR 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/P9C5DBMR Description: Abstract: Data from various sources, including 2018 and 2019 multibeam bathymetry data collected by the National Oceanic and Atmospheric Administration (NOAA) and the U.S. Geological Survey (USGS) were combined to create a composite 30-m resolution multibeam bathymetry surface of southern Cascadia Margin offshore Oregon and northern California. The data are available as a geoTIFF file. Purpose: In 2018 and 2019 the NOAA ships Rainier and Fairweather collected multibeam bathymetry data in 5 areas along the southern Cascadia Margin offshore northern California and southern Oregon as part of a cooperative project between the U.S. Geological Survey, Pacific Coastal and Marine Science Center and NOAA. These regions were combined with other publicly available multibeam bathymetry data. The surface was generated to assist research projects studying offshore geohazards including mapping faults, submarine landslides, sediment transport pathways, and seafloor seeps. These data are not intended to be used for navigation. Supplemental_Information: Additional information about the USGS field activities from which some of these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2018-642-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2019-636-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. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1994 Ending_Date: 2020 Currentness_Reference: ground condition at time data were collected. Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -125.570471 East_Bounding_Coordinate: -124.072995 North_Bounding_Coordinate: 43.415421 South_Bounding_Coordinate: 40.159820 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:b1a31381-7b52-4e71-b488-c9c67c4c030d Theme: Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD) Theme_Keyword: Bathymetry Theme_Keyword: Seafloor Topography Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: bathymetry Theme_Keyword: bathymetry measurement Theme_Keyword: sea-floor characteristics Theme_Keyword: geospatial datasets Theme_Keyword: marine geophysics Theme_Keyword: multibeam sonar 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: seabed Theme_Keyword: field observation 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: State of Oregon Place_Keyword: State of California 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 originators of the dataset and in products derived from these data. Portions of the map used data provided by the Ocean Exploration Trust’s Nautilus Exploration Program, Cruises NA072, NA078, NA080, NA082, NA122. This composite bathymetry grid is intended for research purposes only, studying the seafloor morphology of the southern Cascadia margin. The bathymetry grid is not intended to be used for navigation. 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: CascadiaMargin_composite_bathy_QV.jpg Browse_Graphic_File_Description: Quick view image of the southern Cascadia Margin composite multibeam bathymetry surface Browse_Graphic_File_Type: JPEG Native_Data_Set_Environment: Caris HIPS and SIPS (ver. 11) and ArcMap (ver. 10.3.1) on a Windows 10 computer. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The attribute table in the bathymetry source shapefile (SouthernCascadia_bathy_sources.shp) also included in this data release provides mean differences and standard deviations calculated between each dataset and an adjacent, overlapping dataset. In general there is good agreement in depth values between adjacent datasets. 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 composite multibeam bathymetry surface was generated from a combination of dedicated multibeam surveys, processed bathymetry surfaces received from other institutions, as well as transit data (ancillary data collected while a ship was underway). The bathymetry data were collected over a span of nearly 24 years using a variety of models of multibeam echosounders, GPS systems, position and motion compensation systems, sound velocity profilers, and tide measurements. The attribute table in the bathymetry source shapefile (SouthernCascadia_bathy_sources.shp), also included in this data release provides links to the survey page for each dataset. Some of the datasets provide metadata and reports that describe mapping procedures and data quality including uncertainty measurements and comparisons with other bathymetry data. The horizontal accuracy of bathymetry data in this data release may be lower than stated in the reports due to further processing of the data. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The composite multibeam bathymetry surface was generated from a combination of dedicated multibeam surveys, processed bathymetry surfaces received from other institutions, as well as transit data (ancillary data collected while a ship was underway). The bathymetry data were collected over a span of nearly 24 years using a variety of models of multibeam echosounders, GPS systems, position and motion compensation systems, sound velocity profilers, and tide measurements. The attribute table in the bathymetry source shapefile (SouthernCascadia_bathy_sources.shp), also included in this data release provides links to the survey page for each dataset. Some of the datasets provide metadata and reports that describe mapping procedures and data quality including uncertainty measurements and comparisons with other bathymetry data. The vertical accuracy of bathymetry data in this data release may be lower than stated in the reports due to further processing of the data. Lineage: Process_Step: Process_Description: The Ocean Exploration Trust's, Nautilus Exploration Program collected multibeam echosounder data along the southern Cascadia Margin between 2016 and 2020 (OET survey ID's NA072, NA078, NA080, NA082, and NA122). The U.S. Geological Survey Pacific Coastal and Marine Science Center requested and received both raw line files and processed grids (these data are now available from NOAA, National Centers for Environmental Information, https://ngdc.noaa.gov/mgg/bathymetry/multibeam.html). Raw survey line files were imported and processed in Caris HIPS and SIPS software (version 11). The data were gridded into 30-m surfaces and exported as geoTIFF's or ASCIIRaster files and imported into ArcMap. Process_Date: 2020 Process_Step: Process_Description: Publicly available multibeam echosounder data available from NOAA, National Centers for Environmental Information were downloaded from https://ngdc.noaa.gov/mgg/bathymetry/multibeam.html. Survey ID's include AT26-02, SKQ201607S, SKQ201804S, HLY18TB, MV1405, TN265, TN240, EX0907, RR1803, and SR1810. The raw survey and transit line files were imported and processed in Caris HIPS and SIPS software (version 11). The data were gridded into 30-m surfaces and exported as geoTIFF or ASCIIRaster files and imported into ArcMAP. Process_Date: 2020 Process_Step: Process_Description: California Seafloor Mapping Program multibeam echosounder data collected nearshore in the State waters of California and southern Oregon (Survey ID's H12130, H12131, H11985, H11983, H11982, H11981, H11980, H1197,9 H11978, H11977, H11976, H11975, H11974, H11973) were downloaded as BAG files from NOAA, NCEI, https://ngdc.noaa.gov/mgg/bathymetry/relief.html. The BAG files were imported into ArcMap and resampled to 30-m resolution. Process_Date: 2020 Process_Step: Process_Description: A processed multibeam bathymetry grid from Monterey Bay Aquarium Research Institute (MBARI) was downloaded as an ASCIIRaster file from http://www3.mbari.org/data/mapping/NorCal_Oregon_Margin/eel_river.htm (EelriverA.asc.gz). The bathymetry data were imported into ArcMap and projected from geographic coordinates to UTM, zone 10, WGS84 coordinates. The UTM grid was reprojected to UTM, zone 10, NAD83 coordinates and resampled to 30-m resolution. Process_Date: 2020 Process_Step: Process_Description: Accessed processed multibeam bathymetry data collected by the USGS during field activity 2014-607-FA. Cochrane, G.R., Dartnell, P., Hemery, L.G., and Hatcher, G., 2017, Data release for USGS field activity 2014-607-FA, Oregon OCS seafloor mapping: selected lease blocks relevant to renewable energy (ver. 2.0, July 2017), U.S. Geological Survey data release, https://doi.org/10.5066/F7V40S8V Process_Date: 2020 Process_Step: Process_Description: Accessed from U.S. Geological Survey Pacific Coastal and Marine Science Center archives, processed multibeam bathymetry data collected in 1994 by the R/V Pacific Hunter as part of the STRATAFORM Project. Mayer, L., and J. Hughes Clarke, (1995). STRATAFORM Cruise Report: R/V Pacific Hunter, Multibeam Survey, July14-28. Process_Date: 2020 Process_Step: Process_Description: In 2018 and 2019 the NOAA ships Rainier and Fairweather mapped five regions along the southern Cascadia Margin (NOAA survey IDs H13117, H13118, H13206, W00474, and W00475) using Kongsberg EM-710 multibeam echosounders. These bathymetry surfaces are available from NOAA, National Centers for Environmental Information and were downloaded from https://ngdc.noaa.gov/mgg/bathymetry/multibeam.html as BAG files. The BAG files were imported into Caris HIPS and SIPS, version 11 and converted to LAS files. The files were imported into ArcMap, version 10.8.1 and converted to grids. Process_Date: 2021 Process_Step: Process_Description: If needed, the previously described bathymetry grids were projected to a common horizontal datum (NAD83) using the "Project Raster" tool in ArcToolbox. Also, if needed, the grids were downsampled to 30-m spatial resolution using the "Resample" tool in ArcMap using the bilinear resampling technique. The grids were then merged together using the "Mosaic to New Raster" tool in ArcMap using the "first" mosaic operator. Priority was given to recent dedicated surveys, then older dedicated surveys followed by cleaner transit data and then noisier transit data. The merged grid was exported as a geoTIFF file. Process_Date: 2021 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 12033 Column_Count: 6058 Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 10 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -123.00000 Latitude_of_Projection_Origin: 0.00000 False_Easting: 500000.0 False_Northing: 0.00 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 30.0 Ordinate_Resolution: 30.0 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: NAD83 Ellipsoid_Name: GRS80 Semi-major_Axis: 6378137.00 Denominator_of_Flattening_Ratio: 298.257223563 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: instantaneous sealevel Altitude_Resolution: 0.1 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: value Entity_Type_Definition: Raster values represent depth in meters. Entity_Type_Definition_Source: Producer defined Overview_Description: Entity_and_Attribute_Overview: The complete 30-m resolution "Cascadia_30m_bathy_UTM10_NAD83.tif" grid was originally archived as a TIFF image with the following attributes. >Cell size = 30.0 >Number of rows = 12033 >Number of columns = 6058 > >Data type = floating point > >Boundary >Xmin = 259939 >Xmax = 441679 >Ymin = 4447334 >Ymax = 4808324 > >Statistics >Minimum value = -3756.8 >Maximum value = -1.0 >Mean = -1459.4 >Standard deviation = 1030.3 > >Coordinate system description >Projection UTM >Zone 10 >Datum NAD83 >Units meter 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 GeoTIFF format, including a tif world file (.tfw) and 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: GeoTIFF Format_Version_Number: ArcMap (version 10.3.1) Format_Information_Content: Downloadable zip file contains the TIFF (.tif), and the projection file (.tfw). File_Decompression_Technique: WinZip Transfer_Size: 74.7 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P9C5DBMR Access_Instructions: Data can be downloaded using the Network_Resource_Name link and scrolling down to the Sonar Data section. Fees: None. Technical_Prerequisites: 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. Metadata_Reference_Information: Metadata_Date: 20210823 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