netcdf ocean-time-series/Stellwagen/MYRTLEBEACH/7523fan_raw.cdf {
  dimensions:
    time = UNLIMITED;   // (606 currently)
    scan = 2322;
    points = 500;
  variables:
    int time(time=606);
      :units = "EPIC Julian Day";
      :type = "EVEN";
      :epic_code = 624S; // short

    int time2(time=606);
      :units = "msec since 0:00 GMT";
      :type = "EVEN";
      :epic_code = 624S; // short

    short scan(scan=2322);
      :units = "scan number";
      :type = "EVEN";

    short points(points=500);
      :units = "number of points";
      :type = "EVEN";

    float headangle(scan=2322);
      :long_name = "angle of xducer head during scan";
      :units = "degrees relative to head orientation";
      :valid_range = -180.0f, 180.0f; // float
      :_FillValue = 1.0E35f; // float
      :note1 = "headangle is computed from head_pos";

    short profile_range(time=606, scan=2322);
      :long_name = "first value above threshold";
      :units = "cm";
      :valid_range = 0S, 2048S; // short
      :_FillValue = -32767S; // short
      :note1 = "profile_range is returned in each scan header: combined into a vector";
      :note2 = "var_name matches Imagenex doc";

    short head_pos(time=606, scan=2322);
      :long_name = "Head position during scan";
      :units = "numeric location";
      :valid_range = 0S, 5000S; // short
      :_FillValue = -32767S; // short
      :note1 = "head_pos is returned in each scan header: combined into a vector";
      :note2 = "angle=deg/step*(head_pos-1400)";

    short raw_image(time=606, points=500, scan=2322);
      :long_name = "sonar return echo intensity";
      :units = "?";
      :valid_range = 0S, 252S; // short
      :sensor_type = "Imagenex Model 881 Digital tilt adjust imaging sonar";
      :_FillValue = -32767S; // short
      :scale_factor = 1S; // short
      :note1 = "raw image is matrix of return amplitudes as returned by logger";

    short nDataBytes(scan=2322);
      :long_name = "number of data bytes/scan";
      :units = "count";
      :valid_range = 0S, 550S; // short
      :_FillValue = -32767S; // short
      :note1 = "nDataBytes is returned in each scan header: combined into a vector";
      :note2 = "var_name matches Imagenex doc";

  // global attributes:
  :CREATION_DATE = "22-Apr-2008 13:21:38";
  :DATA_TYPE = "Sonar image data";
  :DATA_SUBTYPE = "MOORED";
  :DATA_ORIGIN = "USGS/WHFC";
  :EXPERIMENT = "Myrtle Beach";
  :PROJECT = "South Carolina Coastal Erosion Study";
  :MOORING = 7523.0f; // float
  :DELTA_T = "5049.5868 sec";
  :COMPOSITE = 1.0f; // float
  :DATA_CMNT = " ";
  :POS_CONST = 0.0f; // float
  :DEPTH_CONST = 0.0f; // float
  :WATER_MASS = "?";
  :DESCRIPT = "Site 7 sonar";
  :DRIFTER = 0.0f; // float
  :history = "Sonar data written to NetCDF by procsonarMM.m V 7.4.0.287 (R2007a); Sonar data downloaded from instrument";
  :start_time = "27-Jan-2004 21:50:00";
  :stop_time = "18-Mar-2004 19:50:00";
  :latitude = 33.7221f; // float
  :longitude = -78.7804f; // float
  :magnetic_variation = -8.22f; // float
  :INST_TYPE = "Imagenex Model 881 Digital tilt adjust imaging sonar";
  :Conventions = "EPIC";
  :Deployment_date = "29-Jan-2004";
  :Recovery_date = "23-Apr-2004";
  :COORD_SYSTEM = "GEOGRAPHIC";
  :WATER_DEPTH = "9.6 M";
  :VAR_FILL = 1.0E35f; // float
  :FILL_FLAG = 0.0f; // float
  :VAR_DESC = "points:scans:head_pos:Headangle:nDataBytes:profile_range:raw_image";
  :metadata_author = "Charlene Sullivan, USGS";
  :Height = 0.53f; // float
  :FirstSonarDay = "27-Jan-2004";
  :LastSonarDay = "19-Mar-2004";
  :RootDataDir = "c:\\home\\data\\processing\\mbch_sonar\\7523\\CLEAN";
  :SonartoAnimate = "Fan";
  :datayear = 2004.0f; // float
  :dxy = 0.02f; // float
  :sweep = 1.0f; // float
  :HeadID = 16.0; // double
  :Range = 5.0; // double
  :RangeOffset = 0.0; // double
  :RevHold = "Reverse Step Direction";
  :MasterSlave = "Send Data Slave Mode";
  :StartGain = 16.0; // double
  :LOGF = 20.0; // double
  :Absorption = 0.06; // double
  :TrainAngle = 0.0; // double
  :SectorWidth = 348.0; // double
  :StepSize = 0.6; // double
  :PulseLength = 10.0; // double
  :StepDirection = 0.0; // double
  :MoveRelative = 0.0; // double
  :DataPoints = 500.0; // double
  :DataBits = 8.0; // double
  :UpBaud = 6.0; // double
  :Profile = "OFF";
  :Calibrate = "Calibrate";
  :SwitchDelay = 2.0; // double
  :HeadType = "IGX";
  :NDataBytes = 500.0; // double
  :NReturnBytes = 513.0; // double
  :NOTE = "vector variables combined from scan headers; names match Imagenex documentation of headers";
  :OperatingFrequency = "1330 kHz";
}