Peter Dartnell Guy R. Cochrane 20160712 1.0 ASCIIRaster data release DOI:10.5066/F7S46Q1J Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/F7S46Q1J https://www.sciencebase.gov/catalog/item/5ee65f5d82ce3bd58d82eb7a Peter Dartnell Guy R. Cochrane 2016 map U.S. Geological Survey data release DOI:10.5066/F7S46Q1J Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/F7S46Q1J This data release presents data for 5-m resolution multibeam-bathymetry data of the northern Channel Islands region, southern California. In 2004 The U.S. Geological Survey, Pacific Coastal and Marine Science Center collected multibeam-bathymetry and acoustic-backscatter data in the northern Channel Islands region, southern California. The region was mapped aboard the R/V Ewing using a Kongsberg Simrad EM-1002 multibeam echosounder. These data were previously published on-line at http://pubs.usgs.gov/of/2005/1153/. In this data release the data have been reprocessed to a finer spatial resolution (5-m versus 15-m) using more modern processing techniques. Due to the large file sizes the entire survey area is provided as two ASCIIRaster files (one for the north portion of the study area and another for the south). These data are intended for policy makers, resource managers, science researchers, students, and the general public. These data can be used with geographic information systems or other software to identify bathymetric features. These data are not intended to be used for navigation. Additional information about the field activity from which these data were derived is available online at: http://cmgds.marineß.usgs.gov/fan_info.php?fan=E104SC Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 20040806 20040815 ground condition at the time the data was collected Complete As needed -119.70 -119.04 34.33 33.86 USGS Metadata Identifier USGS:5ee65f5d82ce3bd58d82eb7a Data Categories for Marine Planning Bathymetry and Elevation Global Change Master Directory (GCMD) Bathymetry Seafloor Topography ISO 19115 Topic Category geoscientificInformation oceans imageryBaseMapsEarthCover USGS Thesaurus multibeam sonar Bathymetry sea-floor acoustic reflectivity marine geology Marine Realms Information Bank (MRIB) keywords marine geology marine geophysics multibeam echo sounder None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC Geographic Names Information System (GNIS) Pacific Ocean State of California Channel Islands Santa Barbara Channel 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 831-427-4747 pcmsc_data@usgs.gov Peter Dartnell Guy Cochrane Mary Elaine Dunaway 2005 ASCII XYZ Reston, VA U.S. Geological Survey Open-File Report https://pubs.usgs.gov/of/2005/1153/ Not applicable for raster data. No formal logical accuracy tests were conducted 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 5 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. Estimated to be no less than 20 cm, 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. The multibeam-bathymetry data were collected along a continuous swath perpendicular to the direction of the ship using a Kongsberg Simrad EM1002 multibeam-sonar system. The data were cleaned of bad navigation and depth readings and corrected for tides to mean lower low water datum using a predictive tide model. The depth readings then were gridded into a common grid. The gridded data are converted to ArcInfo GRID format using ArcInfo's ASCIIGRID command. 20041130 The USGS retrieved the raw survey line files from the USGS archives. The line files were processed in Caris HIPS and SIPS software (version 9). The data were cleaned of bad navigation and depth readings and corrected for tides to mean lower low water datum using a predictive tide model. The data were gridded into base surfaces with 5-m spatial resolution using the Swath Angle process. Base surfaces then were exported as ASCIIRaster files and imported into a GIS. 2016 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 Universal Transverse Mercator 11 0.9996 -123.00000 0.00000 500000.0 0.00 coordinate pair 5.0 5.0 Meters WGS84 WGS84 6378137.00 298.257223563 Due to the large file sizes the entire survey area is provided as two ASCIIRaster files (USGS_NChannelIslands_NorthArea_Bathy_5m.zip and USGS_NChannelIslands_SouthArea_Bathy_5m.zip). The complete 5-m resolution bathymetry grid for the northern region were originally archived as an ESRI grid with the following attributes. >Cell size = 5.0 >Number of rows = 5344 >Number of columns = 8206 > >Data type = floating point > >Boundary >Xmin = 251052 >Xmax = 292082 >Ymin = 3774302 >Ymax = 3801022 > >Statistics >Minimum value = -250.31 >Maximum value = -20.95 >Mean = -152.83 >Standard deviation = 69.47 > >Coordinate system description >Projection UTM >Zone 11 >Datum WGS84 >Vertical Datum MLLW >Units meter The complete 5-m resolution bathymetry grid for the southern region were originally archived as an ESRI grid with the following attributes. >Cell size = 5.0 >Number of rows = 4344 >Number of columns = 9630 > >Data type = floating point > >Boundary >Xmin = 262612 >Xmax = 310762 >Ymin = 3752902 >Ymax = 3774622 > >Statistics >Minimum value = -1047.54 >Maximum value = -67.84 >Mean = -465.64 >Standard deviation = 223.47 > >Coordinate system description >Projection UTM >Zone 11 >Datum WGS84 >Vertical Datum MLLW >Units meter none U.S. Geological Survey - ScienceBase mailing and physical

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 1-888-275-8747 sciencbase@usgs.gov 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. Raster data format ArcMap (version 10.0, Esri, 2011) Raster data layer is registered ASCIIRaster in the UTM Zone 11 coordinate system with datum WGS84. The .zip file (USGS_NChannelIslands_NorthArea_Bathy_5m.zip) includes the ASCIIRaster data (.asc, .prj), as well as FGDC-compliant metadata (.xml) for the north part of the study area WinZip 46 https://www.sciencebase.gov/catalog/file/get/5ee65f5d82ce3bd58d82eb7a?name=USGS_NChannelIslands_NorthArea_Bathy_5m.zip https://www.sciencebase.gov/catalog/item/5ee65f5d82ce3bd58d82eb7a https://doi.org/10.5066/F7S46Q1J Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped file of bathymetry data for the north portion of the study area. The second link points to a landing page for all of the bathymetry data (north and south) and the metadata. The third link points to a landing page for the entire data release. Raster data format ArcMap (version 10.0, Esri, 2011) Raster data layer is registered ASCIIRaster in the UTM Zone 11 coordinate system with datum WGS84. The .zip file (USGS_NChannelIslands_SouthArea_Bathy_5m.zip) includes the ASCIIRaster data (.asc, .prj), as well as FGDC-compliant metadata (.xml) for the south part of the study area WinZip 65 https://www.sciencebase.gov/catalog/file/get/5ee65f5d82ce3bd58d82eb7a?name=USGS_NChannelIslands_SouthArea_Bathy_5m.zip https://www.sciencebase.gov/catalog/item/5ee65f5d82ce3bd58d82eb7a https://doi.org/10.5066/F7S46Q1J Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped file of bathymetry data for the south portion of the study area. The second link points to a landing page for all of the bathymetry data (north and south) and the metadata. The third link points to a landing page for the entire data release. 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 ASCIIRaster. 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 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998