Peter Dartnell Rikk G. Kvitek 2017 GeoTiff https://doi.org/10.5066/F7TH8JWJ Nadine E. Golden 2013 database Data Series DS 781 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/ds/781/ https://www.sciencebase.gov/arcgis/rest/services/Catalog/58a34164e4b0c82512869be3/MapServer https://www.sciencebase.gov/arcgis/services/Catalog/58a34164e4b0c82512869be3/MapServer/WMSServer?request=GetCapabilities&service=WMS This part of DS 781 presents 2-m-resolution data collected by the U.S. Geological Survey in 2007 for the acoustic-backscatter map of the Offshore of Gaviota Map Area, California. The GeoTiff is included in "Backscatter_[USGS07]_OffshoreGaviota.zip," which is accessible from https://doi.org/10.5066/F7TH8JWJ. These data accompany the pamphlet and map sheets of Johnson, S.Y., Dartnell, P., Cochrane, G.R., Hartwell, S.R., Golden, N.E., Kvitek, R.G., and Davenport, C.W. (S.Y. Johnson and S.A. Cochran, eds.), 2018, California State Waters Map Series—Offshore of Gaviota, California: U.S. Geological Survey Open-File Report 2018–1023, pamphlet 41 p., 9 sheets, scale 1:24,000, https://doi.org/10.3133/ofr20181023. The acoustic-backscatter map of the Offshore of Gaviota map area in southern California was generated from acoustic-backscatter data collected by the U.S. Geological Survey (USGS) and by Fugro Pelagos Inc. Acoustic mapping was completed between 2007 and 2008 using a combination of 400-kHz Reson 7125, 240-kHz Reson 8101, and 100-kHz Reson 8111 multibeam echosounders, as well as a 234-kHz SEA SWATHplus bathymetric sidescan-sonar system. These mapping missions combined to collect acoustic-backscatter data from about the 10-m isobath to beyond the limit of California's State Waters. 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 bathymetric features. For additional information CSUMB on Backscatter data online visit <http://seafloor.otterlabs.org>. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology. 2007 2008 ground condition Complete none planned -120.301470 -120.193792 34.467806 34.417476 USGS Metadata Identifier USGS:589a463ce4b0efcedb71a689 Global Change Master Directory (GCMD) Oceans > Backscatter/SeafloorTopography > Backscatter Oceans > Backscatter/SeafloorTopography > Seafloor Topography ISO 19115 Topic Category geoscientificInformation environment oceans imageryBaseMapsEarthCover USGS Thesaurus sea-floor acoustic reflectivity marine geophysics Geographic Names Information System (GNIS) Pacific Ocean State of California Gaviota Santa Barbara County 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://www.sciencebase.gov/catalog/file/get/5898ecd9e4b0efcedb70779e?name=Backscatter_[USGS07]_OffshoreGaviota.jpg&allowOpen=true Backscatter collected by the USGS in 2007 in the Offshore of Gaviota map area JPEG Microsoft Windows Server 2008 R2 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcGIS 10.4.1.5686 Samuel Y. Johnson Peter Dartnell Guy R. Cochrane Stephen R. Hartwell Nadine E. Golden Rikk G. Kvitek Clifton W. Davenport 2018 pamphlet and map sheets Open-File Report 2018-1023 Reston, VA U.S. Geological Survey https://doi.org/10.3133/ofr20181023 Not applicable for raster data. Unspecified Complete Estimated to be no less than 2 m, owing to water depth and total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations. Not applicable to acoustic-backscatter imagery. During the USGS mapping missions, Real Time Kinematic (RTK) GPS data and measurements of vessel motion (heave, pitch, and roll) were combined in a CodaOctopus F190 attitude-and-position system to produce a high-precision vessel-attitude packet. This packet was transmitted to the acquisition software in real time and combined with instantaneous sound-velocity measurements at the transducer head before each ping. The returned samples were projected to the seafloor using a ray-tracing algorithm that works with previously measured sound-velocity profiles. Statistical filters were applied to the raw samples that discriminate the seafloor returns (soundings) from unintended targets in the water column. The resulting normalized-amplitude values were rescaled to 16-bit and gridded into GeoJPEGs using GRID Processor Software, then imported into a Geographic Information System (GIS) and converted to GRIDs. 2010 Pete Dartnell U.S. Geological Survey, Pacific Coastal and Marine Science Center Physical Scientist mailing and physical address

2885 Mission Street

Santa Cruz CA 95060-5792 USA (831) 460-7415 pdartnell@usgs.gov During the Fugro Pelagos Inc. mapping missions, an Applanix POS-MV (Position and Orientation System for Marine Vessels) was used to accurately position the vessels during data collection, and it also accounted for vessel motion such as heave, pitch, and roll with navigational input from GPS receivers. Smoothed Best Estimated Trajectory (SBET) files were post-processed from logged POS-MV files. 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) and heave using the post-processed SBET data. 2016 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 Metadata was modified to add accompanying USGS Open-File Report to the Larger Works section. USGS Thesaurus and keywords were added. Minor typos were corrected. No data information was changed. 20180406 Susan A Cochran U.S. Geological Survey, Pacific Coastal and Marine Science Center Geologist mailing and physical address

2885 Mission Street

Santa Cruz CA 95060-5792 USA (831) 460-7545 scochran@usgs.gov Information for accompanying Open-File Report was moved from secondary Larger Works section to Abstract and Cross Reference sections. Point of Contact information was updated. Details about different Network Resource Name links was given in the Access Instructions section. Phone number for Metadata Contact was corrected. No data information was changed. 20180831 Susan A Cochran U.S. Geological Survey, Pacific Coastal and Marine Science Center Geologist mailing and physical address

2885 Mission Street

Santa Cruz CA 95060-5792 USA (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 2663 4883 1 Universal Transverse Mercator 10 0.9996 -123.00000 0.00000 500000.0 0.00 coordinate pair 2.0 2.0 Meters WGS84 WGS84 6378137.00 298.257223563 The acoustic-backscatter grid was originally archived as an ESRI grid with the following attributes: >Cell size = 2.0 >Number of rows = 2663 >Number of columns = 4883 > >Data type = floating point > >Boundary >Xmin = 748003 >Xmax = 757762 >Ymin = 3812013 >Ymax = 3817335 > >Statistics >Minimum value = 44 >Maximum value = 167 >Mean = 99.91071444805012 >Standard deviation = 6.207676788442939 > >Coordinate system description >Projection UTM >Zone 10 >Datum WGS84 >Units meter Producer defined U.S. Geological Survey - ScienceBase mailing and physical

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov The .zip file (Backscatter_[USGS07]_OffshoreGaviota.zip) includes the .tif, .tfw, .tif.ovr, .tif.aux.xml, and tif.ColorRamp.SLD files, as well as FGDC-compliant metadata for the for backscatter data collected by the USGS in 2007 in the Offshore of Gaviota map area, 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. TIFF ArcMap (version 10.0, ESRI, 2011) Raster data layer is registered TIFF image in the UTM Zone 10 coordinate system with datum NAD83. The .zip file for the TIFF image includes the image (.tif), the world registration file (.tfw), other associated files, and the metadata for the Backscatter data collected by the USGS in 2007 in the Offshore of Gaviota map area, California. WinZip 39.4 https://www.sciencebase.gov/catalog/file/get/589a463ce4b0efcedb71a689?facet=Backscatter_[USGS07]_OffshoreGaviota https://doi.org/10.5066/F7TH8JWJ http://pubs.usgs.gov/ds/781/ Data can be downloaded using the Network Resource links. The first link begins a direct download of this particular dataset. The second link goes to a landing page containing all of the data for a given map area. The third link goes to a landing page for the entire data series, which has links to all the map areas that have data. 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, OffshoreGaviotaGIS.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 "Offshore Gaviota" and has all the data symbolized as on the OFR 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