Guy R. Cochrane David P. Finlayson Evan T. Dailey 2018 TIFF data release DOI:10.5066/F78G8HVC Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/F78G8HVC https://www.sciencebase.gov/catalog/file/get/5b4f9061e4b06a6dd18444a0 Guy R. Cochrane David P. Finlayson Evan T. Dailey 2018 data release DOI:10.5066/F78G8HVC Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/F78G8HVC This portion of the data release presents acoustic backscatter data from the San Miguel Passage, in the Channel Islands, California. The data were collected in August 2007 by the U.S. Geological Survey, Pacific Coastal and Marine Science Center (USGS, PCMSC) using a 234.5 kHz SEA (AP) Ltd. SWATHplus-M phase-differencing sidescan sonar mounted on the NOAA, Channel Islands National Marine Sanctuary R/V Shearwater as part of the research cruise S-2-07-SC. Data were collected in water depths up to 89 meters. The San Miguel Passage is within the Channel Islands National Marine Sanctuary and is the body of water between the two western-most islands of the chain - Santa Rosa and San Miguel Islands. The data were processed at the USGS, PCMSC to create a 2-meter resolution TIFF raster, presented here. These data were collected to characterize seafloor substrate types in the nearshore waters southwest of Santa Rosa Island in the Channel Islands National Marine Sanctuary. Additional information about the field activity from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=S207SC 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. 20070806 20070818 ground condition Complete None planned -120.312 -120.182 34.018 33.895 USGS Metadata Identifier USGS:5b4f9061e4b06a6dd18444a0 ISO 19115 Topic Category elevation oceans Data Categories for Marine Planning Bathymetry and Elevation USGS Thesaurus sea-floor characteristics geospatial datasets marine geophysics interferometric sonar sea-floor acoustic reflectivity Marine Realms Information Bank (MRIB) keywords seabed multibeam echo sounder None U.S. Geological Survey USGS Coastal and Marine Geology Program CMGP Pacific Coastal and Marine Science Center PCMSC Geographic Names Information System (GNIS) Channel Islands National Park Channel Islands Pacific Ocean 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 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 831-460-4747 pcmsc_data@usgs.gov https://www.sciencebase.gov/catalog/file/get/5b4f9061e4b06a6dd18444a0?name=Backscatter_SanMiguelPassage.jpg&allowOpen=true Image map of study area with backscatter intensity raster JPG Data collection was funded by U.S. Geological Survey Microsoft Windows 7 Service Pack 1 with Esri ArcGIS version 10.5.0.6491 No formal attribute accuracy tests were conducted. See spatial accuracy for vertical and horizontal accuracies. All data fall within expected ranges. 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. 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 backscatter imagery. Data Collection: Bathymetry and acoustic-backscatter data were collected in 2007 using a 234.5 kHz SEA (AP) Ltd. SWATHplus-M phase-differencing sidescan sonar, mounted on the NOAA CINMS R/V Shearwater. Data were acquired and processed onboard using SEA Swath Processor (version 2.05) and SEA Grid Processor (version 2.05). Sound velocity profiles (SVPs) were collected with an Applied Micro Systems, SvPlus. The survey vessel was equipped with a dual antenna GPS compass and inertial attitude sensor: F180 Control Software (version 2.04), and the navigation application YONAV2 (version 1.19). GPS navigation data were post-processed with GrafNav (version 7.8) from Waypoint Navigation (NovAtel). Navigation data were processed in both forward and reverse. 20070831 Data Gridding: The survey line files were imported into Caris HIPS and SIPS software (version 7.1.2). Bathymetry data were processed, filtered, and gridded into a 2-meter resolution base surface using the swath angle method. Backscatter data were processed using Caris mosaic module using the SIPS, sidescan engine. The base surface and backscatter mosaic were exported as a TIFF files in UTM-10 coordinates referenced to the NAD83 ellipsoid. The TIFF files were imported into a Geographic Information System (Esri, ArcMap) and converted to a grid. The grid was converted to an 8-bit raster in ArcMap and exported as a TIFF file with a TFW file defining the data’s geographic location and coordinate system. 20070831 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 Performed minor edits to the metadata to correct typos. No data were changed 20211013 U.S. Geological Survey Susan A. Cochran Geologist Mailing and Physical

2885 Mission Street

Santa Cruz CA 95060 831-460-7545 scochran@usgs.gov Raster Grid Cell 6239 5654 Universal Transverse Mercator 10 0.9996 -123.0 0.0 500000.0 0.0 coordinate pair 2.0 2.0 METERS D_North_American_1983 GRS 80 6378137 298.257222101 MLLW 0.1 Meters Explicit elevation coordinate included with horizontal coordinates Attribute table Table containing attribute information associated with the dataset U.S. Geological Survey Value Backscatter intensity U.S. Geological Survey 0 255 Backscatter intensity value U.S. Geological Survey - ScienceBase Mailing and Physical

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov These data are available in TIFF format (Backscatter_SanMiguelPassage_NAD83-UTM10N.tif) contained in a single zip file which also includes a TIFF world file (.tfw), CSDGM FGDC-compliant metadata, and a browse image map of the data (.jpg). 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 Esri ArcGIS 10.5.0.6491 The .zip file contains the TIFF raster (.tif) and the TIFF world file (.tfw), a browse image map, and the metadata. No compression applied. 16.57 https://www.sciencebase.gov/catalog/file/get/5b4f9061e4b06a6dd18444a0 https://doi.org/10.5066/F78G8HVC Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped file of data and metadata. The second link points to a landing page with metadata and data None. These data can be viewed with Esri ArcGIS software. 20211013 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-460-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998