Identification_Information:
  Citation:
    Citation_Information:
      Originator: Benthic Habitat Mapping Group, CRED, PIFSC, NOAA
      Publication_Date: 20100824
      Title: Gridded bathymetry of Ni'ihau Island, Hawaii, USA
      Geospatial_Data_Presentation_Form: raster digital data
      Online_Linkage: http://www.soest.hawaii.edu/pibhmc
      Online_Linkage: http://www.soest.hawaii.edu/pibhmc/pibhmc_mhi_nii_bathy.htm
  Description:
    Abstract: Gridded bathymetry of the shelf, bank and slope environments of Ni'ihau
      Island.  This 5m grid contains data between 0 and 100 meters.
      The multibeam data are from the Simrad EM300 and Reson 8101ER system aboard the         
      NOAA ship Hi'ialakai and R/V AHI as of July 2010.
    Purpose:
      The data were collected in support of Coral Reef Conservation Program goals 
      to map all shallow (0-30 m) coral reefs in US Pacific waters and priority 
      moderate (> 30 m) depth areas by 2009. The data are being used to provide 
      bathymetric and backscatter data for previously unmapped areas; in support 
      of ecosystem management requirements for benthic habitat mapping and 
      location of Essential Fish Habitat; and to study the geologic features of 
      the area.
    Supplemental_Information:
      Multibeam data were collected aboard the NOAA Ship Hi’ialakai, 
      218’ United States National Oceanographic and Atmospheric 
      Administration research ship. The NOAA Ship Hi'ialakai's survey 
      sensors include a 30 kHz Simrad EM300 sonar and a 300 kHz Simrad 
      EM3002d sonar, which provide bathymetry and imagery data, a 
      TSS/Applanix POS/MV Model 320, which measures position, velocity, 
      attitude and heading, and a Seabird SBE 9/11 plus CTD used to 
      measure sound velocity profiles.

      Multibeam data were also collected aboard the R/V AHI (Acoustic 
      Habitat Investigator), a 25’ survey launch owned and operated by 
      the NOAA Pacific Islands Fisheries Science Center in Honolulu,       
      HI. The R/V AHI’s survey sensors include a 240 kHz RESON 8101-ER 
      sonar providing bathymetry and imagery data, a TSS/Applanix 
      POS/MV Model 320 which measures position, velocity, attitude and 
      heading, and a Seabird SBE 19 CTD used to measure sound velocity 
      profiles.
      Specific equipment configurations are documented in cruise metadata from the                 
      following cruises:
      HI0504. These metadata can be accessed at:
      http://www.soest.hawaii.edu/pibhmc/pibhmc_cruise-catalog.htm            
  Time_Period_of_Content:
    Time_Period_Information:
      Range_of_Dates/Times:
        Beginning_Date: 20050613
        Ending_Date: 20050708
    Currentness_Reference: ground condition
  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: As needed
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -160.282350
      East_Bounding_Coordinate: -160.024013
      North_Bounding_Coordinate: 22.056460
      South_Bounding_Coordinate: 21.735042
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: CoRIS Theme Keyword Thesaurus
      Theme_Keyword: EARTH SCIENCE > Biosphere > Aquatic Habitat > Benthic Habitat
      Theme_Keyword: EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Mapping
    Place: 
      Place_Keyword_Thesaurus: CoRIS Place Thesaurus
      Place_Keyword: COUNTRY/TERRITORY > United States of America > Hawaii > Kauai > Niihau Island (21N160W0001)
  Access_Constraints: None
  Use_Constraints: These data are not to be used for navigation purposes.
    Please acknowledge the NOAA Coral Reef Ecosystem Division,
    Pacific Islands Fisheries Science Center and the Pacific Islands Benthic     
    Habitat Mapping Center, School of Ocean and Earth Science and Technology, University 
    of Hawaii as the sources of this information.
  Point_of_Contact: 
    Contact_Information: 
      Contact_Organization_Primary: 
        Contact_Organization: Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), 
          Pacific Islands Fisheries Science Center (PIFSC), NOAA National Marine Fisheries Service (NMFS)
      Contact_Address: 
        Address_Type: mailing and physical
        Address: 1680 East-West Road POST 833
        City: Honolulu
        State_or_Province: HI
        Postal_Code: 96822
        Country: USA
      Contact_Voice_Telephone: 808-956-5239
      Contact_Electronic_Mail_Address: pibhmc@soest.hawaii.edu
      Contact_Instructions: e-mail preferred
  Browse_Graphic:
    Browse_Graphic_File_Name: ftp://ftp.soest.hawaii.edu/pibhmc/website/data/mhi/bathymetry/NII_5m.jpg
    Browse_Graphic_File_Description: Gridded Bathymetry
    Browse_Graphic_File_Type: jpg
  Data_Set_Credit: Pacific Islands Benthic Habitat Mapping Center, Coral Reef Ecosystem Division
     (CRED), Pacific Islands Fisheries Science Center (PIFSC), NOAA
Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report: Data are collected for resource management
      and research purposes and are tested for internal consistency; however,
      no effort is made to compare these data to external references or to 
      other published data.  
  Logical_Consistency_Report: These data are believed to be logically consistent 
      though no tests were performed
  Completeness_Report: Complete
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report:
        Horizontal positioning system: GPS C/A
        Horizontal position accuracy: 25 meters
    Vertical_Positional_Accuracy:
      Vertical_Positional_Accuracy_Report: 
        Range resolution of sonar: varies with depth
        Raw sounding resolution: varies with depth
        Vertical accuracy of gridded product ~ 1% of water depth
  Lineage:
    Process_Step:
     Process_Description: 
      Multibeam swath files are acquired around the island 
      in the Generic Sensor Format (GSF) and are edited on a swath 
      by swath basis using SAIC's SABER editing software. The edited 
      swath files are then combined into a Pure File Magic (PFM) format 
      with a defined grid cell size (5 m) in SABER and area based                 
      editing is performed. The edited PFM is then exported as X,Y,Z 
      data with a value at each grid node. The X,Y,Z data are then 
      gridded using nearneighbor, a Generic Mapping Tools (GMT) 
      algorithm that converts an ASCII or binary table to a netCDF grid 
      file format. NetCDF grids are then converted to an ArcGIS ASCII 
      file format using LINUX/UNIX commands in combination with GMT. 
      GMT is an open source collection of tools for manipulating 
      geographic data sets. Additional information about GMT can be 
      found at: http://www.soest.hawaii.edu/gmt and additional 
      information about the multibeam data processing is recorded in the 
      cruise metadata.

     Process_Date: 20100715
Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Raster
  Raster_Object_Information:
    Raster_Object_Type: Grid Cell
    Row_Count: 7078
    Column_Count: 5285
    Vertical_Count: 1
Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Planar:
      Planar_Coordinate_Information:
        Planar_Coordinate_Encoding_Method: row and column
        Coordinate_Representation:
          Abscissa_Resolution: 5
          Ordinate_Resolution: 5
        Planar_Distance_Units: meters
      Grid_Coordinate_System:
        Grid_Coordinate_System_Name: Universal Transverse Mercator
        Universal_Transverse_Mercator:
          UTM_Zone_Number: 4N
          Transverse_Mercator:
            Scale_Factor_at_Central_Meridian: 0.9996
            Longitude_of_Central_Meridian: -159
            Latitude_of_Projection_Origin: 0
            False_Easting: 500000
            False_Northing: 1000000
    Geodetic_Model:
      Horizontal_Datum_Name: D_WGS_1984
      Ellipsoid_Name: WGS_1984
      Semi-major_Axis: 6378137.000000
      Denominator_of_Flattening_Ratio: 298.257224
  Vertical_Coordinate_System_Definition:
    Depth_System_Definition:
      Depth_Datum_Name: mean lower low water
      Depth_Resolution:  0.01 meters
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute values
Entity_and_Attribute_Information:
  Overview_Description:
    Entity_and_Attribute_Overview:
      Depth values are real values based on the average of the 
      soundings that fell within the extracted grid cells.  The number of 
      soundings per grid cell range from >1000 soundings in shallow depths
      to as few as 20 soundings in deeper areas.  A total error budget for
      this survey has not been developed. Therefore, the accuracy of depth
      measurements should be considered to be within 1 per cent of water depth.
    Entity_and_Attribute_Detail_Citation: none
Distribution_Information:
  Distributor:
    Contact_Information: 
      Contact_Organization_Primary: 
        Contact_Organization: Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), 
          Pacific Islands Fisheries Science Center (PIFSC), NOAA National Marine Fisheries Service (NMFS)
      Contact_Address: 
        Address_Type: mailing and physical
        Address: 1680 East-West Road POST 833
        City: Honolulu
        State_or_Province: HI
        Postal_Code: 96822
        Country: USA
      Contact_Voice_Telephone: 808-956-5239
      Contact_Electronic_Mail_Address: pibhmc@soest.hawaii.edu
      Contact_Instructions: e-mail preferred
  Resource_Description: Downloadable Data
  Distribution_Liability:
    These data are not to be used for navigational purposes.
    NOAA makes no warranty regarding these data, expressed or implied, nor
    does the fact of distribution constitute such a warranty. NOAA cannot
    assume liability for any damages caused by any errors or omissions in
    these data, nor as a result of the failure of these data to function
    on a particular system.
  Standard_Order_Process:
    Digital_Form: Arc ASCII
      Digital_Transfer_Information:
        Format_Name: Arc ASCII
        Format_Information_Content:
          Arc ASCII can be converted to Arc Raster using ArcToolbox Conversion Tools.
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: http://www.soest.hawaii.edu/pibhmc
    Fees: None
Metadata_Reference_Information:
  Metadata_Date: 20100715
  Metadata_Contact:
    Contact_Information: 
      Contact_Organization_Primary: 
        Contact_Organization: Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), 
          Pacific Islands Fisheries Science Center (PIFSC), NOAA National Marine Fisheries Service (NMFS)
      Contact_Address: 
        Address_Type: mailing and physical
        Address: 1680 East-West Road POST 833
        City: Honolulu
        State_or_Province: HI
        Postal_Code: 96822
        Country: USA
      Contact_Voice_Telephone: 808-956-5239
      Contact_Electronic_Mail_Address: pibhmc@soest.hawaii.edu
      Contact_Instructions: e-mail preferred
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Time_Convention: universal time
  Metadata_Access_Constraints: None
  Metadata_Use_Constraints: None