Identification_Information:
  Citation:
    Citation_Information:
      Originator: NOAA Pacific Islands Fisheries Science Center 
        Coral Reef Ecosystem Division Pacific Islands Benthic Habitat Mapping Center
      Publication_Date: 20110431      
      Title: Gridded multibeam bathymetry of Rota Island, Commonwealth 
        of the Northern Mariana Islands (CNMI) 
      Geospatial_Data_Presentation_Form: digital data
      Online_Linkage: http://www.soest.hawaii.edu/pibhmc
      Online_Linkage: http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_rot_bathy.htm
  Description:
    Abstract: Rota Island, CNMI. Bottom coverage was achieved in depths 
      between 0 and -1905 meters; this 5-m grid has data only to 
      -400 m.   The netCDF and Arc ASCII grids include multibeam 
      bathymetry from the Simrad EM300 and Reson 8101 multibeam sonars 
      collected as of May 2010 by the NOAA Coral Reef Ecosystem 
      Division.  The sonar frequencies are 30 and 240 kHz respectively. 
    Purpose:
      These netCDF and ASCII grids were created using data gathered from multibeam soundings for use as a 
      planning and reference document. The data are also being used for benthic habitat 
      mapping, for locating Essential Fish Habitat, and for studying geologic features of
      the area. Refer to supplemental information for description of instrument and survey.
    Supplemental_Information:
      Multibeam data were collected aboard the R/V AHI (Acoustic 
      Habitat Investigator) in 2003 and 2007, 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.

      Multibeam data were collected in 2007 aboard the NOAA Ship Hi’ialakai, a 
      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 NOAA Ship Oscar Elton Sette in 2010, a 224’ (68 m) United States 
      National Oceanographic and Atmospheric Administration research ship. The NOAA Ship 
      Sette's survey sensors included a 240-kHz pole-mounted Reson 8101ER sonar, which provides 
      bathymetry and imagery data, a TSS/Applanix POS/MV Model 320, which measures position,velocity, attitude and 	heading, and a Seabird SBE19 CTD used to measure sound velocity profiles.   

      Specific equipment configurations are documented in metadata from cruises AHI0307, AHI0702, HI0702 and 
      SE1002. 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: 20030922
        Ending_Date: 20100314
    Currentness_Reference: ground condition
  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: As needed
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: 145.107
      East_Bounding_Coordinate: 145.313
      North_Bounding_Coordinate: 14.225
      South_Bounding_Coordinate: 14.092
  Keywords: 
    Theme:
      Theme_Keyword_Thesaurus: CoRIS Theme Thesaurus
      Theme_Keyword: EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry
    Theme:
      Theme_Keyword_Thesaurus: ISO 19115 Topic Category
      Theme_Keyword: elevation
      Theme_Keyword: 006
    Theme:
      Theme_Keyword_Thesaurus: CoRIS Discovery Thesaurus
      Theme_Keyword: Geographic Information > Bathymetry
    Theme:
      Theme_Keyword_Thesaurus: None
      Theme_Keyword: Bathymetry
      Theme_Keyword: Multibeam sonar
    Place:
      Place_Keyword_Thesaurus: None
      Place_Keyword: UTM Zone 55
      Place_Keyword: Rota Island
      Place_Keyword: Commonwealth of the Northern Mariana Islands
      Place_Keyword: United States of America
    Place: 
      Place_Keyword_Thesaurus: CoRIS Place Thesaurus Version 1.0
      Place_Keyword: OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Mariana Islands > Rota Island 
  Access_Constraints: none
  Use_Constraints: These data are not to be used for navigation purposes.
    Please acknowledge NOAA and the Joint Institute for Marine and Atmospheric Research (JIMAR)
    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 Sciences Center (PIFSC), 
          NOAA National Marine Fisheries Service (NMFS)
      Contact_Address:
        Address_Type: mailing and physical address
        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_Facsimile_Telephone: 808-983-3730
      Contact_Electronic_Mail_Address:nmfs.pic.credinfo@noaa.gov
      Contact_Instructions: e-mail preferred
  Browse_Graphic:
    Browse_Graphic_File_Name: ftp://ftp.soest.hawaii.edu/pibhmc/website/data/cnmi-guam/bathymetry/Rot_5m_bathy.jpg
    Browse_Graphic_File_Description: Multibeam Bathymetry
    Browse_Graphic_File_Type: JPEG
  Data_Set_Credit: PIBHMC, CRED, PIFSC, NOAA and JIMAR
   Native_Data_Set_Environment: netCDF file created using the Generic 
     Mapping Tools (GMT) and ArcGIS ASCII file, both created in a 
     LINUX environment
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 (SPS)
        Horizontal position accuracy: 25 m
    Vertical_Positional_Accuracy:
      Vertical_Positional_Accuracy_Report: 1 m
        Raw sounding resolution: Variable
  Lineage:
    Process_Step:
      Process_Description:
        Multibeam swath files are acquired 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
        in SABER and area based editing is performed. The edited PFM is then exported 
        as X,Y,Z. The resulting X,Y,Z data are then gridded using xyz2grd, a Generic 
        Mapping Tools (GMT) algorithm that converts an ASCII or binary table to a netCDF 
        grid file format. GMT is an open source collection of tools for manipulating 
        geographic data sets. Grid nodes with more than one value are set to the average 
        value and unconstrained nodes are set to NaN. Finally, the netCDF grid is 
        clipped at a depth that minimizes data gaps for the specified grid cell size and 
        then converted to an ArcGIS ASCII file format using LINUX/UNIX commands in 
        combination with GMT. Additional information about GMT can be found at: 
        www.soest.hawaii.edu/gmt and additional information about the multibeam data 
        processing is recorded in the cruise metadata.
      Process_Date: 20110331
Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Raster
  Raster_Object_Information: Rota_5m_2010
    Raster_Object_Type: Grid Cell
    Row_Count: 4080
    Column_Count: 4507
    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: 55
          Transverse_Mercator:
            Scale_Factor_at_Central_Meridian: .9996
            Longitude_of_Central_Meridian: -147
            Latitude_of_Projection_Origin: 0
            False_Easting: 500000
            False_Northing: 0
    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 meter.
    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 Sciences Center (PIFSC), 
          NOAA National Marine Fisheries Service (NMFS)
      Contact_Address:
        Address_Type: mailing and physical address
        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_Facsimile_Telephone: 808-983-3730
      Contact_Electronic_Mail_Address:nmfs.pic.credinfo@noaa.gov
      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:
      Digital_Transfer_Information:
        Format_Name: netCDF and Arc ASCII
        Format_Information_Content:
         These data can be downloaded as either a 2-D binary netCDF raster
         grid or an ArcGIS ASCII text file. The netCDF grid
         is the default grid file format used by GMT (Generic Mapping 
         Tools), which created this file. More information can be located 
         at http://www.soest.hawaii.edu/gmt/and 
         http://www.unidata.ucar.edu/software/netcdf/. The Arc ASCII file, 
         for use in ESRI's (http://www.esri.com) GIS software, can be 
         converted to an Arc Raster Grid using ArcToolbox ASCII to Raster 
         conversion tool. 
      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: 20110331
  Metadata_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: Pacific Islands Benthic Habitat Mapping Center (PIBHMC), 
          Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Sciences Center (PIFSC), 
          NOAA National Marine Fisheries Service (NMFS)
      Contact_Address:
        Address_Type: mailing and physical address
        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_Facsimile_Telephone: 808-983-3730
      Contact_Electronic_Mail_Address:nmfs.pic.credinfo@noaa.gov
      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