Metadata:
  Identification_Information:
    Citation:
      Citation_Information:
        Originator: Mercedes D. Erdey
        Originator: Guy R. Cochrane
        Publication_Date: 2015
        Title: Seafloor character, 5 m resolution--Offshore of Aptos, California
        Geospatial_Data_Presentation_Form: GeoTiff
        Series_Information:
          Series_Name: Data Series
          Issue_Identification: DS 781
        Publication_Information:
          Publication_Place: Reston, VA
          Publisher: U.S. Geological Survey
        Online_Linkage: https://doi.org/10.3133/ds781
        Online_Linkage: https://cmgds.marine.usgs.gov/data/csmp/OffshoreAptos/data_catalog_OffshoreAptos.html
        Larger_Work_Citation:
          Citation_Information:
            Originator: Nadine E. Golden
            Publication_Date: 2015
            Title: California State Waters Map Series Data Catalog
            Geospatial_Data_Presentation_Form: database
            Series_Information:
              Series_Name: Data Series
              Issue_Identification: DS 781
            Publication_Information:
              Publication_Place: Reston, VA
              Publisher: U.S. Geological Survey
            Online_Linkage: https://doi.org/10.3133/ds781
    Description:
      Abstract:
        This part of DS 781 presents data for the seafloor-character map Offshore of Aptos, California. Seafloor-character data are provided as two separate grids depending on resolution of the mapping system and processing method. This metadata file refers to the data included in  "SeafloorCharacter_5m_OffshoreAptos.zip," which is 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.

        This raster-format seafloor character map shows three substrate classes Offshore of Aptos, California. The substrate classes mapped in this area have been further divided into the following California Marine Life Protection Act depth zones and slope classes: Depth Zone 3 (30 to 100 m), Depth Zone 4 (100 to 200 m), Depth Zone 5 (greater than 200 m), Slope Class 1 (0 degrees - 5 degrees), and Slope Class 2 (5 degrees - 30 degrees). Depth Zones 1-2 (intertidal to 30 m), and Slopes Classes 3-4 (greater than 30 degrees) are not present in the region covered by this dataset. The map is created using a supervised classification method described by Cochrane (2008).

        References Cited:
        Cochrane, G.R., 2008, Video-supervised classification of sonar data for mapping seafloor habitat, in Reynolds, J.R., and Greene, H.G., eds., Marine habitat mapping technology for Alaska: Fairbanks, University of Alaska, Alaska Sea Grant College Program, p. 185-194, accessed April 5, 2011, at http://doc.nprb.org/web/research/research%20pubs/615_habitat_mapping_workshop/Individual%20Chapters%20High-Res/Ch13%20Cochrane.pdf.
      Purpose: 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 local seafloor character.
      Supplemental_Information:
        Additional information about the field activities from which these data were derived is available online at:

        https://cmgds.marine.usgs.gov/fan_info.php?fan=S709MB
        https://cmgds.marine.usgs.gov/fan_info.php?fan=S1009MB

        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.
    Time_Period_of_Content:
      Time_Period_Information:
        Range_of_Dates/Times:
          Beginning_Date: 1998
          Ending_Date: 2006
      Currentness_Reference: ground condition
    Status:
      Progress: Complete
      Maintenance_and_Update_Frequency: As needed
    Spatial_Domain:
      Bounding_Coordinates:
        West_Bounding_Coordinate: -122.00
        East_Bounding_Coordinate: -121.80
        North_Bounding_Coordinate: 36.88
        South_Bounding_Coordinate: 36.84
    Keywords:
      Theme:
        Theme_Keyword_Thesaurus: USGS Metadata Identifier
        Theme_Keyword: USGS:556f7aace4b0d9246a9fd08e
      Theme:
        Theme_Keyword_Thesaurus: None
        Theme_Keyword: U.S. Geological Survey
        Theme_Keyword: USGS
        Theme_Keyword: Coastal and Marine Hazards and Resources Program
        Theme_Keyword: CMHRP
        Theme_Keyword: Pacific Coastal and Marine Science Center
        Theme_Keyword: PCMSC
        Theme_Keyword: Fisheries
        Theme_Keyword: Backscatter
        Theme_Keyword: Intensity
      Theme:
        Theme_Keyword_Thesaurus: ISO 19115 Topic Category
        Theme_Keyword: geoscientificInformation
        Theme_Keyword: environment
        Theme_Keyword: oceans
        Theme_Keyword: imageryBaseMapsEarthCover
      Theme:
        Theme_Keyword_Thesaurus: Data Categories for Marine Planning
        Theme_Keyword: distributions
        Theme_Keyword: substrate
      Theme:
        Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
        Theme_Keyword: seabed
        Theme_Keyword: sidescan sonar
        Theme_Keyword: marine geophysics
      Theme:
        Theme_Keyword_Thesaurus: USGS Thesaurus
        Theme_Keyword: Geology
        Theme_Keyword: Bathymetry
        Theme_Keyword: ecosystems
        Theme_Keyword: multibeam sonar
        Theme_Keyword: sonar methods
        Theme_Keyword: sidescan sonar
        Theme_Keyword: image mosaics
        Theme_Keyword: marine geophysics
        Theme_Keyword: sea-floor characteristics
        Theme_Keyword: sea-floor acoustic reflectivity
      Theme:
        Theme_Keyword_Thesaurus: Coastal and Marine Ecological Classification Standard (CMECS)
        Theme_Keyword: Marine Nearshore Subtidal
        Theme_Keyword: Marine Offshore Subtidal
        Theme_Keyword: Transform Continental Margin
        Theme_Keyword: Continental/Island Shelf
        Theme_Keyword: Rock Substrate
        Theme_Keyword: Unconsolidated Mineral Substrate
      Place:
        Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
        Place_Keyword: Pacific Ocean
        Place_Keyword: State of California
        Place_Keyword: Aptos
        Place_Keyword: Santa Cruz County
      Place:
        Place_Keyword_Thesaurus: Coastal and Marine Ecological Classification Standard (CMECS)
        Place_Keyword: Northern California Ecoregion
      Stratum:
        Stratum_Keyword_Thesaurus: Coastal and Marine Ecological Classification Standard (CMECS)
        Stratum_Keyword: Substrate
    Access_Constraints: None
    Use_Constraints: 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.
    Point_of_Contact:
      Contact_Information:
        Contact_Organization_Primary:
          Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center
          Contact_Person: PCMSC Science Data Coordinator
        Contact_Address:
          Address_Type: mailing and physical
          Address: 2885 Mission Street
          City: Santa Cruz
          State_or_Province: CA
          Postal_Code: 95060-5792
          Country: US
        Contact_Voice_Telephone: 831-427-4747
        Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
    Browse_Graphic:
      Browse_Graphic_File_Name: https://www.sciencebase.gov/catalog/file/get/5576269de4b032353caef2b1?f=__disk__f7%2F99%2Fda%2Ff799dad65dd563fb266af43221a3f8cbd8a7a2bb&allowOpen=true
      Browse_Graphic_File_Description: Seafloor character types offshore of Aptos, 5m resolution.
      Browse_Graphic_File_Type: JPEG
    Native_Data_Set_Environment: Microsoft Windows Server 2008 R2 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 10.0
    Cross_Reference:
      Citation_Information:
        Originator: Guy R. Cochrane
        Originator: Samuel Y. Johnson
        Originator: Peter Dartnell
        Originator: H. Gary Greene
        Originator: Mercedes D. Erdey
        Originator: Bryan E. Dieter
        Originator: Nadine E. Golden
        Originator: Stephen R. Hartwell
        Originator: Andrew C. Ritchie
        Originator: Rikk G. Kvitek
        Originator: Katherine L. Maier
        Originator: Charles A. Endris
        Originator: Clifton W. Davenport
        Originator: Janet T. Watt
        Originator: Ray W. Sliter
        Originator: David P. Finlayson
        Originator: Lisa M. Krigsman
        Publication_Date: 2016
        Title: California State Waters Map Series--Offshore of Aptos, California
        Geospatial_Data_Presentation_Form: map
        Series_Information:
          Series_Name: Open-File Report
          Issue_Identification: 2016-1025
        Publication_Information:
          Publication_Place: Reston, VA
          Publisher: U.S. Geological Survey
        Online_Linkage: https://doi.org/10.3133/ofr20161025
  Data_Quality_Information:
    Attribute_Accuracy:
      Attribute_Accuracy_Report: Pixel resolution 5 m.
    Logical_Consistency_Report: Classification was done on the basis of training samples delineated by interpreter. The classification was performed using mathematical algorithms then hand-edited by the interpreter to remove noise.
    Completeness_Report: Total coverage for the survey area is 100%. Survey area is defined by coverage of both the multibeam bathymetry and backscatter datasets.
    Positional_Accuracy:
      Horizontal_Positional_Accuracy:
        Horizontal_Positional_Accuracy_Report: Positional information reflects the position of the camera and was collected using a still photo camera, WAAS-enabled GSP unit, recording at between 1 to 2 nm. DGPS (WAAS) accuracy for position is less than 3 meters. (From Garmin GPSMAP 76C/76CS Specifications, M01-10108-00, Rev0304, http://www8.garmin.com/specs/GPSMAP76C_76CSspec.pdf.
    Lineage:
      Source_Information:
        Source_Citation:
          Citation_Information:
            Originator: Peter Dartnell
            Originator: Andrew C. Ritchie
            Originator: David P. Finlayson
            Publication_Date: 2015
            Title: Bathymetry--Offshore of Aptos Map Area, California
            Geospatial_Data_Presentation_Form: raster digital data
            Series_Information:
              Series_Name: Data Series
              Issue_Identification: DS 781
            Publication_Information:
              Publication_Place: Reston, VA
              Publisher: U.S. Geological Survey
            Other_Citation_Details: See metadata for "BathymetryB_USGS_OffshoreAptos" in DS 781 for source data and postprocessing/reprocessing information.
            Online_Linkage: https://www.sciencebase.gov/catalog/item/556f7817e4b0d9246a9fd05c
        Type_of_Source_Media: digital files of gridded bathymetry data (ArcInfo GRID)
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Range_of_Dates/Times:
              Beginning_Date: 2006
              Ending_Date: 2006
          Source_Currentness_Reference: ground condition
        Source_Citation_Abbreviation: bathymetry
        Source_Contribution: Gridded bathymetry data at 3-meter resolution used to help with seafloor character interpretations
      Source_Information:
        Source_Citation:
          Citation_Information:
            Originator: Peter Dartnell
            Originator: Andrew C. Ritchie
            Originator: David P. Finlayson
            Originator: Rikk G. Kvitek
            Publication_Date: 2015
            Title: Backscatter--Offshore of Aptos Map Area, California
            Geospatial_Data_Presentation_Form: raster digital data
            Series_Information:
              Series_Name: Data Series
              Issue_Identification: DS 781
            Publication_Information:
              Publication_Place: Reston, VA
              Publisher: U.S. Geological Survey
            Other_Citation_Details: See metadata for "BackscatterB_Swath_OffshoreAptos" in DS 781 for amplitude source data and postprocessing/reprocessing information.
            Online_Linkage: https://www.sciencebase.gov/catalog/item/556f768ce4b0d9246a9fd058
        Type_of_Source_Media: digital file of gridded amplitude (backscatter) data (ArcInfo GRID)
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Range_of_Dates/Times:
              Beginning_Date: 1998
              Ending_Date: 1998
          Source_Currentness_Reference: ground condition
        Source_Citation_Abbreviation: backscatter
        Source_Contribution: Gridded amplitude data at 5-meter resolution used to help with seafloor character interpretations
      Source_Information:
        Source_Citation:
          Citation_Information:
            Originator: Jane A. Reid
            Originator: Jamey M. Reid
            Originator: Chris J. Jenkins
            Originator: Mark Zimmerman
            Originator: S. Jeffress Williams
            Originator: Michael E. Field
            Publication_Date: 2006
            Title: usSEABED—Pacific Coast (California, Oregon, Washington) offshore surficial-sediment data release
            Series_Information:
              Series_Name: Data Series
              Issue_Identification: DS 182
            Publication_Information:
              Publication_Place: Menlo Park, CA
              Publisher: U.S. Geological Survey
            Online_Linkage: https://doi.org/10.3133/ds182
        Type_of_Source_Media: Esri project files, csv files
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Single_Date/Time:
              Calendar_Date: 2006
          Source_Currentness_Reference: publication date
        Source_Citation_Abbreviation: sediment
        Source_Contribution: seafloor sediment and rock samples used to interpret seafloor character
      Source_Information:
        Source_Citation:
          Citation_Information:
            Originator: Nadine E. Golden
            Originator: Guy R. Cochran
            Publication_Date: 2013
            Title: California Seafloor Mapping Program video and photograph portal
            Series_Information:
              Series_Name: data release
              Issue_Identification: DOI:10.5066/F7J1015K
            Publication_Information:
              Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA
              Publisher: U.S. Geological Survey
            Online_Linkage: https://doi.org/10.5066/F7J1015K
        Type_of_Source_Media: seafloor video and photographs
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Single_Date/Time:
              Calendar_Date: 2013
          Source_Currentness_Reference: publication date
        Source_Citation_Abbreviation: imagery
        Source_Contribution: seafloor video and photographs used to interpret seafloor character
      Process_Step:
        Process_Description:
          The seafloor-character map was produced using video-supervised maximum likelihood classification of the bathymetry and intensity of return from sonar systems. The classification was supervised using signatures defined by hand-drawn polygons located through sediment samples and video-observation ground truthing applying methodology described in Cochrane (2008), available at http://doc.nprb.org/web/research/research%20pubs/615_habitat_mapping_workshop/Individual%20Chapters%20High-Res/Ch13%20Cochrane.pdf.

          The two variants used in this classification were backscatter intensity and derivative rugosity. Rugosity measures terrain ruggedness as the variation in three-dimensional orientation of grid cells within a neighborhood. Vector analysis is used to calculate the dispersion of vectors normal (orthogonal) to grid cells within the specified neighborhood. This method effectively captures variability in slope and aspect into a single measure. Ruggedness values in the output raster map can range from 0 (no terrain variation) to 1 (complete terrain variation). The calculation was performed using the Terrain Ruggedness (VRM) tool within Esri’s Benthic Terrain Modeler (BTM) toolset (available at http://esriurl.com/5754).

          Classes I, II and III values were delineated using multivariate analysis. The resulting map (gridded at 5 m) was cleaned by hand to remove data-collection artifacts (for example trackline nadir). Editing was performed in Photoshop, with which individual pixels were selected and values adjusted to remove noise. Selection occurred without antialiasing, and the resulting grid was identical but for the edited pixels. The three seafloor classes were then colored to indicate which of the five California MLPA  depth zones they are located in: Depth Zone 3 (30 to 100 m), Depth Zone 4 (100 to 200 m), or Depth Zone 5 (greater than 200 m). These were further subdivided into one of the following slope classes: Slope Class 1 (0 degrees - 5 degrees), Slope Class 2 (5 degrees - 30 degrees). Depth Zone 1-2 (intertidal to 30 m) and Slopes Classes 3-4 (greater than 30 degrees) are not present in the region covered by this block.
        Source_Used_Citation_Abbreviation: bathymetry
        Source_Used_Citation_Abbreviation: backscatter
        Source_Used_Citation_Abbreviation: sediment
        Source_Used_Citation_Abbreviation: imagery
        Process_Date: 200910
      Process_Step:
        Process_Description: Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog.
        Process_Date: 20171005
        Process_Contact:
          Contact_Information:
            Contact_Organization_Primary:
              Contact_Organization: U.S. Geological Survey
              Contact_Person: Alan O. Allwardt
            Contact_Position: Contractor -- Information Specialist
            Contact_Address:
              Address_Type: mailing and physical address
              Address: 2885 Mission Street
              City: Santa Cruz
              State_or_Province: CA
              Postal_Code: 95060
            Contact_Voice_Telephone: 831-460-7551
            Contact_Facsimile_Telephone: 831-427-4748
            Contact_Electronic_Mail_Address: aallwardt@usgs.gov
      Process_Step:
        Process_Description: Added keywords from Coastal and Marine Ecological Classification Standard (CMECS) to metadata.
        Process_Date: 20180426
        Process_Contact:
          Contact_Information:
            Contact_Organization_Primary:
              Contact_Organization: U.S. Geological Survey
              Contact_Person: Alan O. Allwardt
            Contact_Position: Contractor -- Information Specialist
            Contact_Address:
              Address_Type: mailing and physical address
              Address: 2885 Mission Street
              City: Santa Cruz
              State_or_Province: CA
              Postal_Code: 95060
            Contact_Voice_Telephone: 831-460-7551
            Contact_Facsimile_Telephone: 831-427-4748
            Contact_Electronic_Mail_Address: aallwardt@usgs.gov
      Process_Step:
        Process_Description: 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.
        Process_Date: 20200915
        Process_Contact:
          Contact_Information:
            Contact_Person_Primary:
              Contact_Person: Susan A Cochran
              Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center
            Contact_Address:
              Address_Type: mailing and physical
              Address: 2885 Mission St.
              City: Santa Cruz
              State_or_Province: CA
              Postal_Code: 95060
              Country: United States
            Contact_Voice_Telephone: 831-460-7545
            Contact_Electronic_Mail_Address: scochran@usgs.gov
      Process_Step:
        Process_Description: Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed.
        Process_Date: 20201019
        Process_Contact:
          Contact_Information:
            Contact_Organization_Primary:
              Contact_Organization: U.S. Geological Survey
              Contact_Person: VeeAnn A. Cross
            Contact_Position: Marine Geologist
            Contact_Address:
              Address_Type: Mailing and Physical
              Address: 384 Woods Hole Road
              City: Woods Hole
              State_or_Province: MA
              Postal_Code: 02543-1598
            Contact_Voice_Telephone: 508-548-8700 x2251
            Contact_Facsimile_Telephone: 508-457-2310
            Contact_Electronic_Mail_Address: vatnipp@usgs.gov
  Spatial_Data_Organization_Information:
    Direct_Spatial_Reference_Method: Raster
    Raster_Object_Information:
      Raster_Object_Type: Pixel
      Row_Count: 866
      Column_Count: 3641
      Vertical_Count: 1
  Spatial_Reference_Information:
    Horizontal_Coordinate_System_Definition:
      Planar:
        Map_Projection:
          Map_Projection_Name: NAD 1983 UTM Zone 10N
          Transverse_Mercator:
            Scale_Factor_at_Central_Meridian: 0.9996
            Longitude_of_Central_Meridian: -123.0
            Latitude_of_Projection_Origin: 0.0
            False_Easting: 500000.0
            False_Northing: 0.0
        Planar_Coordinate_Information:
          Planar_Coordinate_Encoding_Method: coordinate pair
          Coordinate_Representation:
            Abscissa_Resolution: 5.0
            Ordinate_Resolution: 5.0
          Planar_Distance_Units: Meter
      Geodetic_Model:
        Horizontal_Datum_Name: NAD 1983
        Ellipsoid_Name: GRS80
        Semi-major_Axis: 6378137.0
        Denominator_of_Flattening_Ratio: 298.257223563
    Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
        Altitude_Datum_Name: North American Vertical Datum of 1988
        Altitude_Resolution: 2.0
        Altitude_Distance_Units: meters
        Altitude_Encoding_Method: Attribute values
  Entity_and_Attribute_Information:
    Detailed_Description:
      Entity_Type:
        Entity_Type_Label: SeafloorCharacter_OffshoreAptos.tif.vat
        Entity_Type_Definition: The gridded attributes include VALUE - code for the seafloor character classes, COUNT - number of pixels, SLOPE - slope classes, DEPTH_ZONE - depth zones, SUBSTRATE - substrate classes, SUBST_DESC - short description of substrate classes, and FULL_DESC - detailed description of substrate classes. The raster grid can be added to any ESRI ArcMap project.
        Entity_Type_Definition_Source: ESRI
      Attribute:
        Attribute_Label: Rowid
        Attribute_Definition: Internal feature number.
        Attribute_Definition_Source: Esri
        Attribute_Domain_Values:
          Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated.
      Attribute:
        Attribute_Label: VALUE
        Attribute_Definition: This seafloor-character class was produced using video-supervised maximum-likelihood classification of the bathymetry and backscatter (intensity of return) signals from sonar systems. Derivative roughness (rugosity) and backscatter intensity were used as variants in the classification. The resulting five substrate classes (1-3) were divided into the Depth Zones (see Attribute: DEPTH_ZONE) by adding to the original grid value in increments of 10. Depth Zone 2, add 0 to grid value; Depth Zone 3, add 10 to grid value; Depth Zone 4, add 20 to grid value; and Depth Zone 5, add 30 to grid value. The resulting grid was further classified into Slope Classes (see Attribute: SLOPE) by adding to the classified raster values (including depth zones) in increments of 50. Slope Class 1, add 0 to grid value; Slope Class 2, add 50 to grid value; Slope Class 3, add 100 to grid value; and Slope Class 4, add 150 to grid value.
        Attribute_Definition_Source: ESRI
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 11
            Range_Domain_Maximum: 83
            Attribute_Units_of_Measure: Integers 11 - 83 representing seafloor character classes.
      Attribute:
        Attribute_Label: COUNT
        Attribute_Definition: The number of pixels (5m x 5m size grid cell) represented in each seafloor class (see Attribute: VALUE).
        Attribute_Definition_Source: ESRI
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 112
            Range_Domain_Maximum: 86610
            Attribute_Units_of_Measure: Integers 112 - 86610 pixel count.
      Attribute:
        Attribute_Label: SLOPE
        Attribute_Definition: The slope zones for the final seafloor-character map grid were identified on the basis of the smoothed bathymetry grid. The smoothing was done by applying focal statistics to the original bathymetry grid. The tool uses a moving window and calculates the mean value of the central pixel within a circular neighborhood of 20 m radius along the whole raster map. The resulting raster map represents a smoothed value highlighting overall trends and eliminates local varieties in the terrain (such as higher slopes along rock outcrops). Slope class values are: 1 (flat; 0 degrees to 5 degrees), 2 (sloping; 5 degrees to 30 degrees), 3 (steeply sloping; 30 degrees to 60 degrees), or 4 (vertical; 60 degrees to 90 degrees), or 5 (overhang; greater than 90 degrees).
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 1
            Range_Domain_Maximum: 2
            Attribute_Units_of_Measure: Integer value 1 or 2 representing slope class of 0-30 degrees as described above.
      Attribute:
        Attribute_Label: DEPTH_ZONE
        Attribute_Definition: The depth zones for the final seafloor-character map grid were identified on the basis of the smoothed bathymetry grid. The smoothing was done by applying focal statistics to the original bathymetry grid. The tool uses a moving window and calculates the mean value of the central pixel within a circular neighborhood of 20 m radius along the whole raster map. The resulting raster map represents a smoothed value highlighting overall trends and eliminates local varieties in the terrain (such as varying depths along rock outcrops). Depth Zone values are: Depth Zone 1, intertidal; Depth Zone 2, intertidal to 30 m; Depth Zone 3, 30 to 100 m; Depth Zone 4, 100 to 200 m; and Depth Zone 5, deeper than 200 m (California Department of Fish and Game, 2008).
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 3
            Range_Domain_Maximum: 5
            Attribute_Units_of_Measure: Integer values 3-5 representing slope classes as described above.
      Attribute:
        Attribute_Label: SUBSTRATE
        Attribute_Definition: Coded values of the substrate classes. Class 1, Fine- to medium-grained smooth sediment; Class 2, Mixed smooth sediment and rock; Class 3, Rock and boulder, rugose; Class 4, Medium- to coarse- grained sediment; Class 5, Hard anthropogenic material
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 1
            Range_Domain_Maximum: 3
            Attribute_Units_of_Measure: Integer values 1-3 representing substrate classes as described above.
      Attribute:
        Attribute_Label: SUBST_DESC
        Attribute_Definition: Summary description of the four substrate classes coded by the attribute SUBSTRATE. Class 1, Fine- to medium-grained smooth sediment; Class 2, Mixed smooth sediment and rock; Class 3, Rock and boulder, rugose; Class 4, Medium to coarse grained, rippled (Mobile Sed Features); Class 5, Hard anthropogenic material
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Unrepresentable_Domain: Names are in text form, maximum length: 50
      Attribute:
        Attribute_Label: FULL_DESC
        Attribute_Definition: Detailed description of the four substrate classes coded by the attribute SUBSTRATE. Class 1, Low backscatter, low rugosity, typically mud to medium-grained sand, often rippled and/or burrowed; Class 2, Moderate to very high backscatter, low rugosity, typically coarse-grained sand, gravel, cobble and bedrock; Class 3, High backscatter, and high rugosity, typically boulder and rugose bedrock; Class 4, Very high backscatter, low rugosity; typically medium- to coarse-grained, rippled sediment with some shell hash in shallow depressions; Class 5, High backscatter, low rugosity; related to development by humans
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Unrepresentable_Domain: Names are in text form, maximum length: 250
  Distribution_Information:
    Distributor:
      Contact_Information:
        Contact_Organization_Primary:
          Contact_Organization: U.S. Geological Survey
        Contact_Address:
          Address_Type: mailing and physical address
          Address: 345 Middlefield Rd
          City: Menlo Park
          State_or_Province: CA
          Postal_Code: 94025-3561
          Country: USA
        Contact_Voice_Telephone: (650) 329-4309
    Resource_Description: The download includes the TIFF (.tif), TIFF world file (.tfw), and other associated files. The TXT, XML, HTML, and FAQ versions of the metadata for the 5-m resolution Seafloor Character data layer of Offshore of Aptos, California are also included in the download.
    Distribution_Liability: 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.
    Standard_Order_Process:
      Digital_Form:
        Digital_Transfer_Information:
          Format_Name: GeoTiff
          Format_Version_Number: ArcMap (version 10.0, ESRI , 2011)
          Format_Specification: Raster data layer is registered TIFF image in the UTM Zone 10 coordinate system with datum NAD83.
          Format_Information_Content: The download includes the TIFF (.tif), TIFF world file (.tfw), and other associated files. The TXT, XML, HTML, and FAQ versions of the metadata for the 5-m resolution Seafloor Character data layer of Offshore of Aptos, California are also included in the download.
          File_Decompression_Technique: WinZip
          Transfer_Size: 0.09
        Digital_Transfer_Option:
          Online_Option:
            Computer_Contact_Information:
              Network_Address:
                Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/556f7aace4b0d9246a9fd08e
                Network_Resource_Name: https://www.sciencebase.gov/catalog/item/556f7222e4b0d9246a9fd04e
                Network_Resource_Name: https://pubs.usgs.gov/ds/781/
            Access_Instructions: 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.
      Fees: none
    Technical_Prerequisites: 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.
  Metadata_Reference_Information:
    Metadata_Date: 20201019
    Metadata_Contact:
      Contact_Information:
        Contact_Organization_Primary:
          Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center
          Contact_Person: PCMSC Science Data Coordinator
        Contact_Address:
          Address_Type: mailing and physical
          Address: 2885 Mission Street
          City: Santa Cruz
          State_or_Province: CA
          Postal_Code: 95060-5792
          Country: US
        Contact_Voice_Telephone: 831-427-4747
        Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
    Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
    Metadata_Standard_Version: FGDC-STD-001-1998
