Metadata:
  Identification_Information:
    Citation:
      Citation_Information:
        Originator: Eleyne L. Phillips
        Originator: Mercedes D. Erdey
        Originator: Guy R. Cochrane
        Publication_Date: 2013
        Title: Seafloor character--Offshore of Ventura, California
        Geospatial_Data_Presentation_Form: GeoTiff
        Larger_Work_Citation:
          Citation_Information:
            Originator: Samuel Y. Johnson
            Originator: Peter Dartnell
            Originator: Guy R. Cochrane
            Originator: Nadine E. Golden
            Originator: Eleyne L. Phillips
            Originator: Andrew C. Ritchie
            Originator: Rikk G. Kvitek
            Originator: H. Gary Greene
            Originator: Lisa M. Krigsman
            Originator: Charles A. Endris
            Originator: Gordon G. Seitz
            Originator: Carlos I. Gutierrez
            Originator: Ray W. Sliter
            Originator: Mercedes D. Erdey
            Originator: Florence L. Wong
            Originator: Mary M. Yoklavich
            Originator: Amy E. Draut
            Originator: Patrick E. Hart
            Originator: Susan A. Cochran
            Publication_Date: 2013
            Title: California State Waters Map Series--Offshore of Ventura, California
            Geospatial_Data_Presentation_Form: map
            Series_Information:
              Series_Name: Scientific Investigations Map
              Issue_Identification: SIM 3254
            Publication_Information:
              Publication_Place: Reston, VA
              Publisher: U.S. Geological Survey
            Online_Linkage: http://pubs.usgs.gov/sim/3254/
        Larger_Work_Citation:
          Citation_Information:
            Originator: Nadine E. Golden
            Publication_Date: 2013
            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: http://pubs.usgs.gov/ds/781/
    Description:
      Abstract:
        This part of SIM 3254 presents data for the seafloor-character map (see sheet 7, SIM 3254) of the Offshore of Ventura map area, California. The raster data file is included in "SeafloorCharacter_OffshoreVentura.zip," which is accessible from http://pubs.usgs.gov/ds/781/OffshoreVentura/data_catalog_OffshoreVentura.html. This raster-format seafloor-character map shows four substrate classes in the Offshore of Ventura map area. The substrate classes mapped in this area have been colored to indicate which of the following California Marine Life Protection Act depth zones and slope classes they belong: Depth Zone 2 (intertidal to 30 m), Depth Zone 3 (30 to 100 m), and Slope Class 1 (0 degrees - 5 degrees). Depth Zones 1 (intertidal) and 4 to 5 (greater than 100 m), as well as Slopes Classes 2 to 4 (greater than 5¯), are not present in this map area. The map is created using a supervised classification method described by Cochrane (2008), available at http://doc.nprb.org/web/research/research%20pubs/615_habitat_mapping_workshop/Individual%20Chapters%20High-Res/Ch13%20Cochrane.pdf.  Additional information about the field activities from which this data set was derived are available online by field activities Z-2-06-SC and S-W1-09-SC: <http://walrus.wr.usgs.gov/infobank/z/z206sc/html/z-2-06-sc.meta.html> and <http://walrus.wr.usgs.gov/infobank/s/sw109sc/html/s-w1-09-sc.meta.html>.

        References Cited:

        California Department of Fish and Game, 2008, California Marine Life Protection Act master plan for marine protected areas--Revised draft: California Department of Fish and Game, accessed April 5 2011, at http://www.dfg.ca.gov/mlpa/masterplan.asp.

        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.

        Sappington, J.M., Longshore, K.M., and Thompson, D.B., 2007, Quantifying landscape ruggedness for animal habitat analysis--A case study using bighorn sheep in the Mojave Desert: Journal of Wildlife Management, v. 71, p. 1,419-1,426.

      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:
        Information for USGS Coastal and Marine Geology related activities are online at
        <http://walrus.wr.usgs.gov/infobank/z/z206sc/html/z-2-06-sc.meta.html> and <http://walrus.wr.usgs.gov/infobank/z/z107sc/html/z-1-07-sc.meta.html>.
    Time_Period_of_Content:
      Time_Period_Information:
        Range_of_Dates/Times:
          Beginning_Date: 20060706
          Ending_Date: 20070927
      Currentness_Reference: ground condition
    Status:
      Progress: Complete
      Maintenance_and_Update_Frequency: As needed
    Spatial_Domain:
      Bounding_Coordinates:
        West_Bounding_Coordinate: -119.447913
        East_Bounding_Coordinate: -119.251007
        North_Bounding_Coordinate: 34.374585
        South_Bounding_Coordinate: 34.214948
    Keywords:
      Place:
        Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
        Place_Keyword: Ventura Harbor
        Place_Keyword: Ventura
        Place_Keyword: Santa Barbara Channel
        Place_Keyword: Pacific Ocean
        Place_Keyword: California
      Theme:
        Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD)
        Theme_Keyword: Oceans > Bathymetry/SeafloorTopography > Bathymetry
        Theme_Keyword: Oceans > Bathymetry/SeafloorTopography > Seafloor Topography
      Theme:
        Theme_Keyword_Thesaurus: General
        Theme_Keyword: Marine Geology
        Theme_Keyword: Multibeam
        Theme_Keyword: Geology
        Theme_Keyword: Bathymetry
        Theme_Keyword: Backscatter
        Theme_Keyword: Intensity
        Theme_Keyword: Ocean Floor Topography
        Theme_Keyword: U.S. Geological Survey
        Theme_Keyword: USGS
        Theme_Keyword: Pacific Coastal and Marine Science Center
        Theme_Keyword: CMGP
      Theme:
        Theme_Keyword_Thesaurus: ISO 19115 Topic Category
        Theme_Keyword: biota
        Theme_Keyword: oceans
      Theme:
        Theme_Keyword_Thesaurus: General
        Theme_Keyword: Seafloor character
        Theme_Keyword: Fisheries
        Theme_Keyword: Ecosystem
    Access_Constraints: None
    Use_Constraints:  Please recognize the U.S. Geological Survey (USGS) and the California State University, Monterey Bay, Seafloor Mapping Lab (CSUMB). USGS-authored or produced data and information are in the public domain. This information is not intended for navigational purposes.
      Read and fully comprehend the metadata prior to data use. Uses of these data should not violate the spatial resolution of the data.
      Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data.
      Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey.
      This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to
      rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and
      review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any
      damages resulting from its authorized or unauthorized use.
      Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as
      well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
    Point_of_Contact:
      Contact_Information:
        Contact_Person_Primary:
          Contact_Person: Guy Cochrane
          Contact_Organization:
            U.S. Geological Survey,
            Pacific Coastal and Marine Science Center
        Contact_Position: Geophysicist
        Contact_Address:
          Address_Type: mailing and physical address
          Address: 400 Natural Bridges Dr.
          City: Santa Cruz
          State_or_Province: CA
          Postal_Code: 95060-5792
          Country: USA
        Contact_Voice_Telephone: (831) 460-7555
        Contact_Facsimile_Telephone: (831) 427-4709
        Contact_Electronic_Mail_Address: gchorane@usgs.gov
  Data_Quality_Information:
    Attribute_Accuracy:
      Attribute_Accuracy_Report: Pixel resolution 2 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, <https://buy.garmin.com/shop/store/assets/pdfs/specs/gpsmap76c_76cs_spec.pdf>).
    Lineage:
      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 (for details, see Sappington and others, 2007).
          Classes I, II, and III were delineated using multivariate analysis. Class IV (rugged anthropogenic material) values are a sub-class of seafloor class III, these pixels were depicted based on visual characteristics and known location of man-made features. The resulting map (gridded at 2 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 four seafloor classes were then colored to indicate which of the five California MLPA  depth zones they are located in: Depth Zone 2 (intertidal to 30 m), 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), Slope Class 3 (30 degrees - 60 degrees), or Slope Class 4 (60 degrees - 90 degrees). Depth Zone 1 (intertidal), Depth Zone 4 to 5 (greater than 100 m), and Slopes Classes 2 to 4 (greater than 5¯) are not present in this map area.
        Process_Date: 200910
  Spatial_Data_Organization_Information:
    Direct_Spatial_Reference_Method: Raster
    Raster_Object_Information:
      Raster_Object_Type: Pixel
      Row_Count: 8944
      Column_Count: 8944
      Vertical_Count: 1
  Spatial_Reference_Information:
    Horizontal_Coordinate_System_Definition:
      Planar:
        Map_Projection:
          Map_Projection_Name: WGS 1984 UTM Zone 11N
          Transverse_Mercator:
            Scale_Factor_at_Central_Meridian: 0.9996
            Longitude_of_Central_Meridian: -117.0
            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: 0.000000002220024164500956
            Ordinate_Resolution: 0.000000002220024164500956
          Planar_Distance_Units: Meter
      Geodetic_Model:
        Horizontal_Datum_Name: D WGS 1984
        Ellipsoid_Name: WGS 1984
        Semi-major_Axis: 6378137.0
        Denominator_of_Flattening_Ratio: 298.257223563
  Entity_and_Attribute_Information:
    Detailed_Description:
      Entity_Type:
        Entity_Type_Label: SeafloorCharacter_OffshoreVentura.tif.vat
        Entity_Type_Definition: The shapefile 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 shapefile 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 four substrate classes (1-4) 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: 1
            Range_Domain_Maximum: 12
            Attribute_Units_of_Measure: Integers 1 - 12 on the basis of classification method described in chapter 4 and sheet 5 of SIM 3254 ("California State Waters Map Series--Offshore of Ventura, California"), available at http://pubs.usgs.gov/ds/781/OffshoreVentura/data_catalog_OffshoreVentura.html.
      Attribute:
        Attribute_Label: COUNT
        Attribute_Definition: The number of pixels (2m x 2m size grid cell) represented in each seafloor class (see Attribute: VALUE).
        Attribute_Definition_Source: ESRI
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 1081
            Range_Domain_Maximum: 21204114
            Attribute_Units_of_Measure: Integers 1081 - 21204114 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 (0 degrees to 5 degrees), 2 (5 degrees to 30 degrees), 3 (30 degrees to 60 degrees), or 4 (60 degrees to 90 degrees).
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 1
            Range_Domain_Maximum: 1
            Attribute_Units_of_Measure: Integer value 1 representing slope class of <5 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: 2
            Range_Domain_Maximum: 3
            Attribute_Units_of_Measure: Integer values 2-3 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, Anthropogenic features
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum: 1
            Range_Domain_Maximum: 4
            Attribute_Units_of_Measure: Integer values 1-4 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, Rugged 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, High backscatter, high 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:
            United States Geological Survey (USGS)
            Coastal and Marine Geology (CMG)
          Contact_Person: Guy R. Cochrane
        Contact_Position: Geophysicist
        Contact_Address:
          Address_Type: mailing and physical address
          Address: 400 Natural Bridges Drive
          City: Santa Cruz
          State_or_Province: CA
          Postal_Code: 95060
          Country: USA
        Contact_Voice_Telephone: (831) 460-7554
        Contact_Facsimile_Telephone: (831) 427-4748
        Contact_Electronic_Mail_Address: gchochrane@usgs.gov            
    Resource_Description: Downloadable Data
    Distribution_Liability:
      These data not intended for navigational purposes.
      Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user.
      Neither the U.S. Government nor any agency thereof, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights.
      Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.
    Standard_Order_Process:
      Digital_Form:
        Digital_Transfer_Information:
          Format_Name: ArcInfo GRID
          Format_Version_Number: 10.0
          Transfer_Size: 305.16 MB
        Digital_Transfer_Option:
          Online_Option:
            Computer_Contact_Information:
              Network_Address:
                Network_Resource_Name: none
      Fees: None
  Metadata_Reference_Information:
    Metadata_Date: 2012
    Metadata_Contact:
      Contact_Information:
        Contact_Person_Primary:
          Contact_Person: Mercedes D. Erdey
          Contact_Organization: U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center
        Contact_Position: Geologist
        Contact_Address:
          Address_Type: mailing and physical address
          Address: 400 Natural Bridges Drive
          City: Santa Cruz
          State_or_Province: California
          Postal_Code: 95060
          Country: USA
        Contact_Voice_Telephone: (831)460-7416
        Contact_Electronic_Mail_Address: merdey-heydorn@usgs.gov
    Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
    Metadata_Standard_Version: FGDC-STD-001-1998
    Metadata_Time_Convention: local time
    Metadata_Extensions:
      Online_Linkage: http://www.esri.com/metadata/esriprof80.html
      Profile_Name: ESRI Metadata Profile