Peter Dartnell Andrew C. Ritchie David P. Finlayson 2015 1.0 GeoTiff Data Series DS 781 Reston, VA U.S. Geological Survey https://doi.org/10.3133/ds781 https://cmgds.marine.usgs.gov/data/csmp/OffshoreAptos/data_catalog_OffshoreAptos.html Nadine E. Golden 2015 database Data Series DS 781 Reston, VA U.S. Geological Survey https://doi.org/10.3133/ds781 This part of DS 781 presents data for the bathymetry map of Offshore of Aptos map area, California. Bathymetry data are provided as two separate grids depending on mapping agency and processing method. This metadata file refers to the data included in "BathymetryB_CSUMB_OffshoreAptos.zip" which are accessible from https://doi.org/10.5066/F7K35RQB. These data accompany the pamphlet and map sheets of Cochrane, G.R., Johnson, S.Y., Dartnell, P., Greene, H.G., Erdey, M.D, Dieter, B.E., Golden, N.E., Hartwell, S.R., Ritchie, A.C., Kvitek, r.G., Maier, K.L., Endris, C.A., Davenport, C.W., Watt, J.T., Sliter, R.W., Finlayson, D.P., and Krigsman, L.M., (G.R. Cochrane and S.A. Cochran, eds.), 2016, California State Waters Map Series—Offshore of Aptos, California: U.S. Geological Survey Open-File Report 2016–1025, 43 p., 10 sheets, scale 1:24,000, https://doi.org/10.3133/ofr20161025. The bathymetry and shaded-relief maps of Offshore Aptos, California, were generated from bathymetry data collected by the U.S. Geological Survey (USGS) and by California State University, Monterey Bay (CSUMB). Mapping was completed between 2006 and 2009 using a combination of a 244-kHz Reson 8101 multibeam echosounder and a 234-kHz SEA SWATHplus bathymetric sidescan-sonar system. The mapping missions collected bathymetry data from about the 10-m isobath to beyond the 3-nautical-mile limit of California's State Waters. NOTE: The horizontal datum of this bathymetry data (NAD83) differs from the horizontal datum of other layers in this data release (WGS84). 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 seafloor features. 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 2009 ground condition Complete None planned -122.00 -121.80 37.00 36.84 USGS Metadata Identifier USGS:556f7817e4b0d9246a9fd05c Global Change Master Directory (GCMD) Seafloor Topography None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC Fisheries ISO 19115 Topic Category geoscientificInformation environment oceans imageryBaseMapsEarthCover Data Categories for Marine Planning distributions bathymetry and elevation Marine Realms Information Bank (MRIB) keywords seabed sidescan sonar marine geophysics USGS Thesaurus sonar methods bathymetry measurement bathymetry marine geophysics Coastal and Marine Ecological Classification Standard (CMECS) Marine Nearshore Subtidal Marine Offshore Subtidal Transform Continental Margin Continental/Island Shelf Rock Substrate Unconsolidated Mineral Substrate Geographic Names Information System (GNIS) Pacific Ocean State of California Aptos Santa Cruz County Coastal and Marine Ecological Classification Standard (CMECS) Northern 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://www.sciencebase.gov/catalog/file/get/5576269de4b032353caef2b1?f=__disk__09%2Fab%2F63%2F09ab63811c4864567dc9e821c6e6feff234b26bc&allowOpen=true Bathymetry map of offshore Aptos. JPEG Microsoft Windows Server 2008 R2 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 10.0 Guy R. Cochrane Samuel Y. Johnson Peter Dartnell H. Gary Greene Mercedes D. Erdey Bryan E. Dieter Nadine E. Golden Stephen R. Hartwell Andrew C. Ritchie Rikk G. Kvitek Katherine L. Maier Charles A. Endris Clifton W. Davenport Janet T. Watt Ray W. Sliter David P. Finlayson Lisa M. Krigsman 2016 map Open-File Report 2016-1025 Reston, VA U.S. Geological Survey https://doi.org/10.3133/ofr20161025 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. 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. During the CSUMB mapping mission, 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 (position accuracy, ±2 m; pitch, roll, and heading accuracy, ±0.02°; heave accuracy, ±5%, or 5 cm). To account for tidal-cycle fluctuations, KGPS data(GPS data with real-time kinematic corrections) was used; in addition, 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 KGPS receivers. Finally, the soundings were converted into a 3-m-resolution bathymetric-surface-model grid. 2006 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 California State University, Monterey Bay, Seafloor Mapping Lab 3-m resolution bathymetry data (SoCy_3mbathy) within this map area were downloaded from California State University, Monterey Bay, Seafloor Mapping Lab (http://seafloor.csumb.edu/SFMLwebDATA.htm). The 3-m resolution bathymetry grid was clipped to the Offshore of Aptos, California, map boundary. 2014 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 Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. 20171005 U.S. Geological Survey Alan O. Allwardt Contractor -- Information Specialist mailing and physical address

2885 Mission Street

Santa Cruz CA 95060 831-460-7551 831-427-4748 aallwardt@usgs.gov Added keywords from Coastal and Marine Ecological Classification Standard (CMECS) to metadata. 20180426 U.S. Geological Survey Alan O. Allwardt Contractor -- Information Specialist mailing and physical address

2885 Mission Street

Santa Cruz CA 95060 831-460-7551 831-427-4748 aallwardt@usgs.gov Edits were made to bring the metadata up to current PCMSC standards including standardizing authors' names, adding a doi# link, correcting typos, refining keywords, and using current access and distribution liability statements. Point of Contact and Metadata Contact information sections were changed to static PCMSC contact information. No data were changed. Users are advised to compare the metadata date of this file to any similar file to ensure they are using the most recent version. 20200908 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 5870 5943 1 Universal Transverse Mercator 10 0.9996 -123.00000 0.00000 500000.0 0.00 coordinate pair 3.0 3.0 Meters NAD83 GRS80 6378137.00 298.257223563 North American Vertical Datum of 1988 2.0 meters Attribute values Value BathymetryB [CSUMB] depth values ESRI VALUE Bathymetry depth values ESRI -268.03 -74.76 meters The complete CSUMB 3-m resolution bathymetry grid for Offshore of Aptos were originally archived as an ESRI grid with the following attributes. NOTE: the horizontal datum of the bathymtry data (NAD83) differs from the horizontal datum of other layers in this DS (WGS84). >Cell size = 3.0 >Number of rows = 5870 >Number of columns = 5943 > >Data type = floating point > >Boundary >Xmin = 588830 >Xmax = 606659 >Ymin = 4077950 >Ymax = 4095560 > >Statistics >Minimum value = -268.03 >Maximum value = -74.76 >Mean = -128.94 >Standard deviation = 44.88 > >Coordinate system description >Projection UTM >Zone 10 >Datum NAD83 >Vertical Datum NAVD88 >Units meter none U.S. Geological Survey mailing and physical address

345 Middlefield Rd

Menlo Park CA 94025-3561 USA (650) 329-4309 The download includes the image (.tif), the world registration file (.tfw), and a color ramp file. The TXT, XML, HTML, and FAQ versions of the metadata for the BathymetryB [CSUMB] data layer of Offshore of Aptos, California are also included in the download. 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 with datum NAD83. The download includes the image (.tif), the world registration file (.tfw), and a color ramp file. The TXT, XML, HTML, and FAQ versions of the metadata for the BathymetryB [CSUMB] data layer of Offshore of Aptos, California are also included in the download. WinZip 3.7 https://www.sciencebase.gov/catalog/file/get/556f7817e4b0d9246a9fd05c https://www.sciencebase.gov/catalog/item/556f7222e4b0d9246a9fd04e https://pubs.usgs.gov/ds/781/ Data can be downloaded using the Network Resource links. 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, OffshoreAptosGIS.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 Aptos" and has all the data symbolized as on the data release 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