Peter Dartnell Eleyne L. Phillips Andrew C. Ritchie Rikk G. Kvitek Samuel Y. Johnson 2012 1.0 GeoTiff Data Series DS 781 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/ds/781/ https://pubs.usgs.gov/ds/781/HuenemeCanyon/data_catalog_HuenemeCanyon.html https://pubs.usgs.gov/ds/781/HuenemeCanyon/data/BackscatterA_CSUMB_HuenemeCanyon.zip Nadine E. Golden 2013 database Data Series DS 781 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/ds/781/ This part of DS 781 presents data for part of the acoustic-backscatter map of the Hueneme Canyon and Vicinity map area, California. Backscatter data are provided as separate grids depending on mapping system or processing method. The raster data file is included in "BackscatterA_CSUMB_HuenemeCanyon.zip," which is accessible from https://pubs.usgs.gov/ds/781/HuenemeCanyon/data_catalog_HuenemeCanyon.html. These data accompany the pamphlet and map sheets of Johnson, S.Y., Dartnell, P., Cochrane, G.R., Golden, N.E., Phillips, E.L., Ritchie, A.C., Kvitek, R.G., Greene, H.G., Krigsman, L.M., Endris, C.A., Clahan, K.B., Sliter, R.W., Wong, F.L., Yoklavich, M.M., and Normark, W.R. (S.Y. Johnson, ed.), 2012, California State Waters Map Series—-Hueneme Canyon and Vicinity, California: U.S. Geological Survey Scientific Investigations Map 3225, 41 p., 12 sheets, scale 1:24,000, https://pubs.usgs.gov/sim/3225/. The acoustic-backscatter map of Hueneme Canyon and Vicinity map area, California, was generated from backscatter data collected by California State University, Monterey Bay, Seafloor Mapping Lab (CSUMB) and by the U.S. Geological Survey (USGS). This metadata file describes the acoustic-backscatter data collected by CSUMB. See https://pubs.usgs.gov/ds/781/HuenemeCanyon/metadata/BackscatterB_USGS_HuenemeCanyon_metadata.txt for a description of the acoustic-backscatter data collected by the USGS. The majority of the acoustic-backscatter data within the Hueneme Canyon and vicinity, California, map area was collected by CSUMB in the summers of 2006 and 2007, using a 244-kHz Reson 8101 multibeam echosounder. Within the acoustic-backscatter imagery, brighter tones indicate higher backscatter intensity, and darker tones indicate lower backscatter intensity. The intensity represents a complex interaction between the acoustic pulse and the seafloor, as well as characteristics within the shallow subsurface, providing a general indication of seafloor texture and composition. Backscatter intensity depends on the acoustic source level; the frequency used to image the seafloor; the grazing angle; the composition and character of the seafloor, including grain size, water content, bulk density, and seafloor roughness; and some biological cover. Harder and rougher bottom types such as rocky outcrops or coarse sediment typically return stronger intensities (high backscatter, lighter tones), whereas softer bottom types such as fine sediment return weaker intensities (low backscatter, darker tones). 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. 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. 2006 2008 ground condition Complete As needed -119.338007 -119.139569 34.223097 34.058099 USGS Metadata Identifier USGS:25aaeb81-9644-4917-bcef-b2508c28d122 Global Change Master Directory (GCMD) Acoustic Reflectivity Data Categories for Marine Planning distributions physical habitats and geomorphology Marine Realms Information Bank (MRIB) keywords seabed multibeam echo sounder USGS Thesaurus sonar methods image mosaics interferometric sonar marine geophysics sea-floor characteristics sea-floor acoustic reflectivity maps and atlases geospatial datasets None U.S. Geological Survey USGS Coastal and Marine Geology Program CMGP Pacific Coastal and Marine Science Center PCMSC Coastal and Marine Ecological Classification Standard (CMECS) Marine Nearshore Subtidal Marine Offshore Subtidal Transform Continental Margin Continental/Island Shelf Rock Substrate Unconsolidated Mineral Substrate ISO 19115 Topic Category geoscientificinformation imageryBaseMapsEarthCover oceans Geographic Names Information System (GNIS) Hueneme Canyon Ventura Port of Hueneme Oxnard State of California Pacific Ocean Coastal and Marine Ecological Classification Standard (CMECS) Southern California Ecoregion Coastal and Marine Ecological Classification Standard (CMECS) Substrate 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 navigation purposes. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060-5792 US 831-427-4747 pcmsc_data@usgs.gov https://pubs.usgs.gov/ds/781/HuenemeCanyon/images/BackscatterA_CSUMB_HuenemeCanyon.jpg Acoustic backscatter imagery of Hueneme Canyon and Vicinity collected by California State University Monterey Bay JPEG Microsoft Windows Server 2008 R2 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 10.0 Samuel Y. Johnson Peter Dartnell Guy R. Cochrane Nadine E. Golden Eleyne L. Phillips Andrew C. Ritchie Rikk G. Kvitek H. Gary Greeene Lisa M. Krigsman Charles A. Endris Kevin B. Clahan Ray W. Sliter Florence L. Wong Mary M. Yoklavich William R. Normark 2012 pamphlet and map sheets Scientific Investigations Map 3225 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sim/3225/ Not applicable for raster data. Unspecified Complete 0.5 meters Not applicable CSUMB acoustic-backscatter data were collected in the summers of 2006 and 2007, using a 244-kHz Reson 8101 multibeam echosounder. During the CSUMB mapping missions, an Applanix positioning and motion compensation system (POS/MV) was used to accurately position the vessel during data collection, and it also accounted for vessel motion such as heave, pitch, and roll (position accuracy, +/-2 m; pitch, roll, and heading accuracy, +/-0.02 degrees; heave accuracy, +/-5 percent, or 5 cm). NavCom 2050 GPS receiver (CNAV) data were used to account for tidal-cycle fluctuations, and sound-velocity profiles were collected with an Applied Microsystems (AM) SVPlus sound velocimeter. Soundings were corrected for vessel motion using the Applanix POS/MV data, for variations in water-column sound velocity using the AM SVPlus data, and for variations in water height (tides) using vertical-position data from the CNAV receiver. 2007 Carrie Bretz Seafloor Mapping Lab, California State University Monterey Bay Projects Manager, GIS; Metadata Supervisor mailing and physical address

100 Campus Center, Bldg 13

Seaside CA 93955 USA (831) 582-4197 carrie_bretz@csumb.edu USGS received original Caris HIPS/SIPS projects from CSUMB for CSUMB survey blocks A-H. Backscatter data were postprocessed by the USGS using CARIS7.0/Geocoder software. Geobars were created for each survey line using the beam-averaging engine. Intensities were radiometrically corrected (including despeckling and angle-varying gain adjustments), and the position of each acoustic sample was geometrically corrected for slant range on a line-by-line basis. The contrast and brightness of some geobars were adjusted to better match the surrounding geobars. Individual geobars were mosaicked together at 2-m resolution using the auto-seam method. The mosaics were then exported from CARIS as georeferenced TIFF images, imported into a GIS, and converted to GRIDS and clipped to the Hueneme Canyon and Vicinity, California, map boundary. 2009 Metadata was modified to bring up to current USGS PCMSC standards. Information for accompanying Scientific Investigations Report added to Abstract and Cross Reference sections. Point of Contact information was updated. USGS Thesaurus and keywords were added, and Process Steps were refined. Details about different Network Resource Name links was given in the Access Instructions section. Phone number for Metadata Contact was corrected. Minor typos were corrected. No data information was changed. 20180911 Susan A Cochran U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical

2885 Mission St.

Santa Cruz CA 95060 United States 831-460-7545 scochran@usgs.gov Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. 20201019 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Raster Grid Cell Universal Transverse Mercator 11 0.9996 -117.00000 0.00000 500000.0 0.00 coordinate pair 2.0 2.0 Meters WGS84 WGS84 6378137.00 298.257223563 The complete 2006 - 2007 backscatter data were originally archived as an ESRI grid with the following attributes: >Cell size = 2.0 >Number of rows = 8958 >Number of columns = 8958 > >Data type = floating point > >Boundary >Xmin = 284625.00 >Xmax = 302541.00 >Ymin = 3771055.00 >Ymax = 3788971.00 > >Statistics >Minimum value = 0 >Maximum value = 254 >Mean = 140.45 >Standard deviation = 24.02 > >Coordinate system description >Projection UTM >Zone 11 >Datum WGS84 >Units meter none U.S. Geological Survey mailing and physical address

345 Middlefield Rd

Menlo Park CA 94025-3561 USA (650) 329-4309 The .zip file (BackscatterA_CSUMB_HuenemeCanyon.zip) includes the .tfw, .tif, .tif.aux.xml, and .tif.ovr, files, as well as FGDC-compliant metadata for the backscatter data collected by CSUMB in the Hueneme Canyon and Vicinity region of California. 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. GeoTiff ArcMap (version 10.0, ESRI, 2011) Raster data layer is registered TIFF image in the UTM Zone 10 coordinate system. The .zip file for the TIFF image includes the image (.tif), the world registration file (.tfw), and FGDC-compliant metadata. WinZip 35 https://pubs.usgs.gov/ds/781/HuenemeCanyon/data/BackscatterA_CSUMB_HuenemeCanyon.zip https://pubs.usgs.gov/ds/781/HuenemeCanyon/data_catalog_HuenemeCanyon.html https://pubs.usgs.gov/ds/781/ The first link will begin a direct download of the data. The second link is a landing page on which all of the downloadable data for a particular region are listed. The third link is a landing page for the entire data catalog. none 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 an Esri ArcMap TIFF. Users should download the ArcGIS Project File, HuenemeCanyonGIS.mxd.zip, a compressed (with the "zip" command) version of the ArcMap document (.mxd) that has all the data layers loaded in the table of contents for “Hueneme Canyon and Vicinity“ and has all the data symbolized as on the map sheets. Download and save this ArcGIS project file, including all data layers, to the directory the user has created for this GIS. 20201019 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060-5792 US 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998