Identification_Information:
  Citation:
    Citation_Information:
      Originator: NOAA Pacific Island Fisheries Science Center 
        Coral Reef Ecosystem Division Pacific Islands Benthic Habitat 
        Mapping Center
      Publication_Date: 20071230
      Title: Gridded multibeam bathymetry of Uracus (Farallon de Parajos), 
        Maug, and Asuncion Islands and Supply Reef, Commonwealth of the 
        Northern Mariana Islands (CNMI).
      Geospatial_Data_Presentation_Form: digital data
      Online_Linkage: http://www.soest.hawaii.edu/pibhmc
  Description:
    Abstract: Gridded bathymetry shelf, bank and slope environments of 
      Uracus (Farallon de Parajos), Maug, and Asuncion Islands and Supply 
      Reef, CNMI. Bottom coverage was achieved in depths between -4 and 
      -3275 meters. The netCDF and Arc ASCII grids include multibeam 
      bathymetry from the Simrad EM300 and Reson 8101 multibeam sonars 
      collected as of June 2007 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 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 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 metadata from 
      cruises AHI0703 and HI0703. 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: 20070525
        Ending_Date: 20070608
    Currentness_Reference: ground condition
  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: As needed
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: 144.817
      East_Bounding_Coordinate: 145.650
      North_Bounding_Coordinate: 20.717
      South_Bounding_Coordinate: 19.050
  Keywords: 
    Theme: 
      Theme_Keyword_Thesaurus: CoRIS Theme Thesaurus Version 1.0
      Theme_Keyword: EARTH SCIENCE > Oceans > Bathymetry/Seafloor 
        Topography > Bathymetry
    Theme:
      Theme_Keyword_Thesaurus: None
      Theme_Keyword: Bathymetry
      Theme_Keyword: Multibeam sonar
    Place:
      Place_Keyword_Thesaurus: None
      Place_Keyword: Uracus Island
      Place_Keyword: Farallon de Parajos
      Place_Keyword: Supply Reef
      Place_Keyword: Maug Islands
      Place_Keyword: Asuncion 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 > Uracus Island > Supply Reef > Maug Islands > 
        Asuncion Island
      Place_Keyword: COUNTRY/TERRITORY > United States of America > 
        Hawaii > Honolulu 
  Access_Constraints: none
  Use_Constraints: These data are not to be used for navigation 
      purposes. Please acknowledge NOAA Pacific Islands Fisheries 
      Science Center, 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 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: NMARN_60m.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 on and around each island and 
       bank 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 (60 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 and 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: 20070926
Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Raster
  Raster_Object_Information:
    Raster_Object_Type: Grid Cell
    Row_Count: 2860
    Column_Count: 1406
    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: 60
          Ordinate_Resolution: 60
        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: 0.9996
            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 these data have 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 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:
      Digital_Transfer_Information:
        Format_Name: netCDF or 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: 20071002
  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