Identification_Information:

  Citation:
    Citation_Information:
      Originator: 
          Gibbs, Ann E.
      Publication_Date:  20001018
      Title: SWWA98_500UTM: Southwest Washington, 500 meter, 
             1926/1998 Bathymetry Grid, UTM Projection
      Edition:  Version 1.0
      Geospatial_Data_Presentation_Form:  raster digital data
      Publication_Information:
        Publication_Place:  Menlo Park, CA
        Publisher: U.S. Geological Survey (USGS)
           

  Description:
    Abstract:
      SWWA98_500UTM is a digital bathymetric surface grid of the seafloor off
      the coast of Southwest Washington and Northwest Oregon.  
      Grid cell spacing is 500m and the projection is UTM Zone 10.
      The surface grid was produced by merging National Ocean Service (NOS)
      Hydrographic Surveys conducted between 1926 and 1927 with recent
      surveys conducted by the U.S. Army Corps of Engineers (USACE) in 1998
      around the entrances to Grays Harbor, Willapa Bay, and the Columbia
      River. The results of this work represent the best available estimate of
      the seafloor morphology for the time period circa 1998. The
      user is cautioned, however, to use this data set with full knowledge of
      the original intent, the limitations, and assumptions used to generate it.
    Purpose:
      This bathymetric surface grid is intended for use as a modern bathymetric
      base map for scientific research. It is not intended for navigational
      purposes.  The grid was originally intended for use in wave modelling
      experiments as part of the Southwest Washington Coastal Erosion Study
      (SWCES), a cooperative study by the US Geological Survey and the
      Washington State Department of Ecology.
    Supplemental_Information:
      The SWCES was initiated to examine coastal geology, processes, and
      natural hazards within the Columbia River littoral cell.  The study is
      jointly directed by the U.S. Geological Survey Coastal and Marine
      Geology Program and the Washington State Department of Ecology
      Shorelands and Environmental Assistance Program, with
      active participation of local communities in Pacific and Grays Harbor
      counties. Related USGS work in the Southwest Washington Coastal Erosion
      Study can be found online at:
      http://www.ecy.wa.gov/programs/sea/swce/ 

      The grid described here is part of a data release of sixteen similar
      bathymetric grids.  These include: 1926 and 1926-1998 merged
      Oregon/Washington (ORWA) and Southwest Washington study area (SWWA)
      grids, each at 500m and 750m grid spacing, in UTM Zone 10 (meters)
      and Washington State Plane South Zone 5626 (meters) projections.
      The ORWA data set extends from Heceta Head, Oregon to Cape Johnson,
      Washington, from the shoreline to about 2000m water depth; the SWWA data
      set extends from Tillamook Head Oregon to Pt. Grenville WA, from the
      shore to approximately 700m water depth. 

      The data used to create this bathymetric grid were collected between
      1926 and 1998. Most data were collected between 1926 and 1927.
      Refer to Gibbs and others, 2000 for details.

  Time_Period_of_Content:
    Time_Period_Information:
      Range_of_Dates/Times:
        Beginning_Date:  1926
        Ending_Date:  1998
    Currentness_Reference:  ground condition

  Status:
    Progress:  Complete
    Maintenance_and_Update_Frequency:  As needed
            
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -124.55891725
      East_Bounding_Coordinate: -123.91819534
      North_Bounding_Coordinate: 47.35233047
      South_Bounding_Coordinate: 45.87474294

  Keywords:
    Theme:
      Theme_Keyword_Thesaurus:  None
      Theme_Keyword:  Coastal Geology
      Theme_Keyword:  Marine Geology
      Theme_Keyword:  Bathymetry
      Theme_Keyword:  Hydrographic Data
      Theme_Keyword:  Southwest Washington Coastal Erosion Study
      Theme_Keyword:  Columbia River Littoral Cell
    Place:
      Place_Keyword_Thesaurus:  None
      Place_Keyword:  Southwest Washington
      Place_Keyword:  Northwest Oregon
      Place_Keyword:  Washington
      Place_Keyword:  Oregon
      Place_Keyword:  Grays Harbor
      Place_Keyword:  Willapa Bay
      Place_Keyword:  Columbia River
      Place_Keyword:  Pacific Ocean
      Place_Keyword:  Pacific Northwest
      Place_Keyword:  USA

  Access_Constraints:  None

  Use_Constraints:
    Please recognize the U.S. Geological Survey (USGS) as the source of
    this information.

    Although these data have been used by the U.S. Geological Survey,
    U.S. Department of the Interior, no warranty expressed or implied
    is made by the U.S. Geological Survey as to the accuracy of the
    data. The act of distribution shall not constitute any such warranty, and
    no responsibility is assumed by the U.S. Geological Survey in the
    use of this data, software, or related materials.

    This information is not intended for navigational purposes.

    Any use of trade, firm, or product names is for descriptive
    purposes only and does not imply endorsement by the U.S.
    Government.

    Feel free to use the data but please cite this publication:
    Gibbs, A.E., Buijsman, M.C., and Sherwood, C.R., 2000, 
    Non-navigational Gridded Bathymetry Data : The Washington-Oregon
    Coast, 1926-1998; A data release and description of methods. 
    USGS Open-File-Report OF 00-448.

  Point_of_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization:
          United States Geological Survey (USGS),
          Coastal and Marine Geology (CMG)
        Contact_Person: Ann E. Gibbs
      Contact_Position: Geologist
      Contact_Address:
        Address_Type: mailing address
        Address: USGS, MailStop 999, 345 Middlefield Road
        City: Menlo Park
        State_or_Province: CA
        Postal_Code: 94025-3561
        Country: USA
      Contact_Voice_Telephone: (650) 329-5060
      Contact_Facsimile_Telephone: (650) 329-5190
      Contact_Electronic_Mail_Address: agibbs@usgs.gov

  Data_Set_Credit:
    The authors would like to thank Eric Nelson of the Seattle District Army
    Corps of Engineers for the Grays Harbor and Willapa Bay survey data, and
    H. Rod Moritz of the Portland District Corps for Columbia River entrance
    surveys.

    This Program is jointly funded by the Washington State Department of
    Ecology and the US Geological Survey, Coastal & Marine Geology Program.

  Native_Data_Set_Environment:
    SunOS UNIX, ARC/INFO version 7.2.1, SURFER V.6

  Cross_Reference:
    Citation_Information:
      Originator:  Ann E. Gibbs and Guy Gelfenbaum
      Publication_Date:  1999
      Title: Bathymetric change off the Washington/Oregon Coast
      Series_Information:
        Series_Name:  Coastal Sediments '99
        Issue_Identification:
          Proceedings of the 4th International Symposium 
          on Coastal Engineering and Science 
          of Coastal Sediment Processes

  Cross_Reference:
    Citation_Information:
      Originator:  Gibbs, A.E., Buijsman, M.C., and Sherwood, C.R.,
      Publication_Date:  2000
      Title: 
       Non-navigational Gridded Bathymetry Data : The Washington-Oregon Coast,
       1926-1998; A data release and description of methods
      Series_Information:
        Series_Name: USGS Open-File-Report 
        Issue_Identification:
         OF 00-448

Data_Quality_Information:

  Attribute_Accuracy:
    Attribute_Accuracy_Report:
      The data have been thoroughly analyzed for for gross inaccuracies.  
      A discussion of errors and accuracies associated with the original
      data collection methodologies can be found in Gibbs and Gelfenbaum
      (1999).
  Logical_Consistency_Report:
    Only NOS sounding data with an original cartographic code of 711
    are included.  The data set was rigorously edited
    of obviously erroneous points.
  Completeness_Report:
    Gaps in the hydrographic survey point data exists west of Willapa Bay
    from approximately -124.034 to -124.363 degrees longitude and
    46.573 to 46.738 degrees latitude and northwest of Tillamook Bay
    from approximately -123.834 to -124.120 longitude and 
    45.472 to 45.626 latitude. The remaining data are considered complete.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report:  
        Horizontal accuracies for NOS surveys vary by water depth and
        distance from shore (see Gibbs and Gelfenbaum, 1999).
        Modern ACE surveys used DGPS and RTK positioning and
        have an accuracy of less than one meter.
    Vertical_Positional_Accuracy:
      Vertical_Positional_Accuracy_Report:  
        Vertical accuracies for NOS surveys vary by water depth and
        distance from shore (see Gibbs and Gelfenbaum, 1999).
        Modern ACE surveys used single-beam digital fathometers, RTK tides,
        heave and swell compensator, and have an accuracy of less than 
        one-half meter.
  Lineage:
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator:  National Geophysical Data Center
          Publication_Date:  1998
          Title:
            National Ocean Service Hydrographic Survey Data:
            US Coastal Waters. CD-ROM Set, Version 4.0.
            Data announcement 98-MGG-03.
            World Data Center for Marine Geology & Geophysics, Boulder CO
      Type_of_Source_Media:  CD-ROM
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Range_of_Dates/Times:
            Beginning_Date:  1926
            Ending_Date:  1974
        Source_Currentness_Reference:  ground condition
      Source_Citation_Abbreviation:  NOS_HSD
      Source_Contribution:
        All pre-1998 hydrographic data were obtained from this source.
    Process_Step:
      Process_Description:
        See Gibbs, A.E., 2000 for additional information
      Process_Date:  1999
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: US Army Corps of Engineers; Seattle District
          Publication_Date:  Unpublished material
          Title:  1998 Grays Harbor Approach and Conditions Survey
      Type_of_Source_Media:  online
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date:  1998
        Source_Currentness_Reference:  ground condition
      Source_Citation_Abbreviation:  GRAYS98
      Source_Contribution:
        Included in merged 1926/1998 data sets
    Process_Step:
      Process_Description:
        Converted from WASP 4602 feet to WASP 5626 meters
        and merged into data set.
        See Gibbs and others, 2000 for additional information
      Process_Date:  1999
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: US Army Corps of Engineers; Seattle District
                      and Waterways Experiment Station
          Publication_Date:  Unpublished material
          Title:  1998 Willapa Bay Hydrographic Survey
      Type_of_Source_Media:  online
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date:  1998
        Source_Currentness_Reference:  ground condition
      Source_Citation_Abbreviation:  WILLAPA98
      Source_Contribution:
        Included in merged 1926/1998 data sets
    Process_Step:
      Process_Description:
        Converted from WASP 4602 feet to WASP 5626 meters
        and merged into data set.
        See Gibbs and others, 2000 for additional information
      Process_Date:  1999
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: US Army Corps of Engineers; Portland District
          Publication_Date:  Unpublished material
          Title:  1998 MCR Approach Survey
      Type_of_Source_Media:  online
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date:  1998
        Source_Currentness_Reference:  ground condition
      Source_Citation_Abbreviation:  MCR_98_AP
      Source_Contribution:
        Included in merged 1926/1998 data sets
    Process_Step:
      Process_Description:
        Converted from OR SP 5076 feet NAD27, to WASP 5626 meters NAD83 and
        merged into data set.
        See Gibbs and others, 2000 for additional information
      Process_Date:  1999
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: US Army Corps of Engineers; Portland District
                      and US Geological Survey, CMG
          Publication_Date:  Unpublished material
          Title:  1998 MCR Extension survey
      Type_of_Source_Media:  online
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date:  1998
        Source_Currentness_Reference:  ground condition
      Source_Citation_Abbreviation:  MCR_98_EX
      Source_Contribution:
        Included in merged 1926/1998 data sets
    Process_Step:
      Process_Description:
        Converted from WASP 4602 feet to WASP 5626 meters and
        merged into data set.
        See Gibbs and others, 2000 for additional information
      Process_Date:  1999
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: US Geological Survey, CMG
          Publication_Date:  Unpublished material
          Title:  Point coverage SWWA26PTS_UTM
          Edition: Version 1.0
      Type_of_Source_Media:  online
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Range_of_Dates/Times:
            Beginning_Date:  1926
            Ending_Date:  1927
        Source_Currentness_Reference:  ground condition
      Source_Citation_Abbreviation:  SWWA26PTS_UTM
      Source_Contribution:
         Edited NOS hydrographic data points used for gridding.
    Process_Step:
      Process_Description:
        NOS_HSD data projected from Lat/Long NAD27 to WASP South
        Zone 5626, edited of erroneous points, and converted to UTM10.
        See Gibbs and others, 2000 for additional information
      Process_Date:  1999


Spatial_Data_Organization_Information:

  Direct_Spatial_Reference_Method:  Raster
  Raster_Object_Information:
    Raster_Object_Type:  Grid Cell
    Row_Count:  372
    Column_Count:  93


Spatial_Reference_Information:

  Horizontal_Coordinate_System_Definition:
    Planar:
      Grid_Coordinate_System:
        Grid_Coordinate_System_Name:  Universal Transverse Mercator
        Universal_Transverse_Mercator:
          UTM_Zone_Number:  10
          Transverse_Mercator:
            Scale_Factor_at_Central_Meridian:  0.9996
            Longitude_of_Central_Meridian:  -123.
            Latitude_of_Projection_Origin:  0.0
            False_Easting:  0.000
            False_Northing:  -500000
      Planar_Coordinate_Information:
        Planar_Coordinate_Encoding_Method:  row and column
        Coordinate_Representation:
          Abscissa_Resolution:  500
          Ordinate_Resolution:  500
        Planar_Distance_Units:  meters
    Geodetic_Model:
      Horizontal_Datum_Name:  North American Datum of 1983
      Ellipsoid_Name:  Geodetic Reference System 80
      Semi-Major_Axis: 6378206.4
      Denominator_of_Flattening_Ratio:  294.98

  Vertical_Coordinate_System_Definition:
    Depth_System_Definition:
      Depth_Datum_Name:  Mean lower low water
      Depth_Resolution:  1.0
      Depth_Distance_Units:  meters
      Depth_Encoding_Method:
        Explicit depth coordinate included with horizontal coordinates


Distribution_Information:

  Distributor:
      Contact_Information:
        Contact_Organization_Primary:
          Contact_Organization:
            United States Geological Survey (USGS),
            Coastal and Marine Geology (CMG)
          Contact_Person: Ann E. Gibbs
        Contact_Position: Geologist
        Contact_Address:
          Address_Type: mailing address
          Address: USGS, MailStop 999, 345 Middlefield Road
          City: Menlo Park
          State_or_Province: CA
          Postal_Code: 94025-3561
          Country: USA
        Contact_Voice_Telephone: (650) 329-5060
        Contact_Facsimile_Telephone: (650) 329-5190
        Contact_Electronic_Mail_Address: agibbs@usgs.gov

  Distribution_Liability:
    Please recognize the US Geological Survey and
    Southwest Washington Coastal Erosion Study
    as the source of this information

    Although these data have been used by the U.S.
    Geological Survey, U.S. Department of the Interior,
    no warranty expressed or implied is made by the U.S.
    Geological Survey as to the accuracy of the data.

    The act of distribution shall not constitute any such
    warranty, and no responsibility is assumed by the
    U.S. Geological Survey in the use of this data,
    software, or related materials.

Metadata_Reference_Information:

  Metadata_Date:  20001018

  Metadata_Contact:
      Contact_Information:
        Contact_Organization_Primary:
          Contact_Organization:
            United States Geological Survey (USGS),
            Coastal and Marine Geology (CMG)
          Contact_Person: Ann E. Gibbs
        Contact_Position: Geologist
        Contact_Address:
          Address_Type: mailing address
          Address: USGS, MailStop 999, 345 Middlefield Road
          City: Menlo Park
          State_or_Province: CA
          Postal_Code: 94025-3561
          Country: USA
        Contact_Voice_Telephone: (650) 329-5060
        Contact_Facsimile_Telephone: (650) 329-5190
        Contact_Electronic_Mail_Address: agibbs@usgs.gov
  
  Metadata_Standard_Name:  FGDC Content Standards for Digital Geospatial Metadata

  Metadata_Standard_Version: FGDC-STD-001-1998