netcdf ocean-time-series/Stellwagen/DIAMONDSHOALS/8553pen_raw.cdf {
  dimensions:
    time = UNLIMITED;   // (269 currently)
    scan = 884;
    points = 500;
  variables:
    int time(time=269);
      :units = "EPIC Julian Day";
      :type = "EVEN";
      :epic_code = 624S; // short

    int time2(time=269);
      :units = "msec since 0:00 GMT";
      :type = "EVEN";
      :epic_code = 624S; // short

    short scan(scan=884);
      :units = "scan number";
      :type = "EVEN";

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

    float headangle(scan=884);
      :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";
      :initial_sensor_height = 1.06f; // float
      :sensor_depth = 13.72f; // float
      :serial_number = "3937";

    short profile_range(time=269, scan=884);
      :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";
      :initial_sensor_height = 1.06f; // float
      :sensor_depth = 13.72f; // float
      :serial_number = "3937";

    short head_pos(time=269, scan=884);
      :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)";
      :initial_sensor_height = 1.06f; // float
      :sensor_depth = 13.72f; // float
      :serial_number = "3937";

    short raw_image(time=269, points=500, scan=884);
      :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";
      :initial_sensor_height = 1.06f; // float
      :sensor_depth = 13.72f; // float
      :serial_number = "3937";

    short nDataBytes(scan=884);
      :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";
      :initial_sensor_height = 1.06f; // float
      :sensor_depth = 13.72f; // float
      :serial_number = "3937";

  // global attributes:
  :CREATION_DATE = "20-Oct-2010 12:11:10";
  :DATA_TYPE = "Sonar image data";
  :DATA_SUBTYPE = " ";
  :DATA_ORIGIN = "USGS/WHSC";
  :EXPERIMENT = "Carolinas Coastal Change Proceses Program";
  :PROJECT = "USGS Coastal and Marine Geology Program";
  :MOORING = 855.0f; // float
  :DELTA_T = "21600";
  :COMPOSITE = 0.0f; // float
  :DATA_CMNT = " ";
  :POS_CONST = 0.0f; // float
  :DEPTH_CONST = 0.0f; // float
  :WATER_MASS = "?";
  :DESCRIPT = "North site, minipod, pen sonar data";
  :DRIFTER = 0.0f; // float
  :history = "Trimmed using trunc_img,  SVN $Revision: 1630 $ to select records in the range 11 to 279.  :Sonar data written to NetCDF by mkrawcdf, SVN $Revision: 1471 $, using Matlab 7.8.0.347 (R2009a); Sonar data downloaded from instrument";
  :start_time = "13-Jan-2009 01:15:00";
  :stop_time = "20-Mar-2009 14:15:00";
  :latitude = 35.1783f; // float
  :longitude = -75.4234f; // float
  :magnetic_variation = -10.78f; // float
  :INST_TYPE = "Imagenex Model 881A digital profiling sonar";
  :Conventions = "EPIC";
  :Deployment_date = "12-Jan-2009";
  :Recovery_date = "1-May-2009";
  :FILL_FLAG = 1.0f; // float
  :VAR_DESC = "points:scans:head_pos:Headangle:nDataBytes:profile_range:raw_image";
  :metadata_author = "Ellyn Montgomery, USGS";
  :SectorSweep = 132.0f; // float
  :AngleSweepAround = 0.0f; // float
  :StepSize = 0.3; // double
  :DataPoints = 500.0; // double
  :Height = 1.06f; // float
  :FirstSonarDay = "12-Jan-2009";
  :LastSonarDay = "20-Mar-2009";
  :RootDataDir = "C:\\home\\data\\processing\\Hatteras09\\855NorthMinipod\\855sonar\\im";
  :SonartoAnimate = "pen";
  :datayear = 2009.0f; // float
  :FillVal = 1.0E35f; // float
  :DegPerStep = 0.15f; // float
  :dxy = 0.01f; // float
  :PencilTime = 2454842.5f; // float
  :HeadID = 16.0; // double
  :Range = 3.0; // double
  :RevHold = "Reverse Step Direction";
  :MasterSlave = "Send Data Slave Mode";
  :StartGain = 20.0; // double
  :LOGF = 10.0; // double
  :Absorption = 0.6; // double
  :TrainAngle = 0.0; // double
  :SectorWidth = 132.0; // double
  :PulseLength = 10.0; // 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 = "Pencil data";
  :Frequency = "900 kHz";
  :WATER_DEPTH = 14.7828f; // float
  :serial_number = "3937";
}