netcdf ocean-time-series/Stellwagen/FI12/9212fan_raw.cdf {
  dimensions:
    time = UNLIMITED;   // (167 currently)
    scan = 4644;
    points = 500;
  variables:
    int time(time=167);
      :units = "EPIC Julian Day";
      :type = "EVEN";
      :epic_code = 624S; // short

    int time2(time=167);
      :units = "msec since 0:00 GMT";
      :type = "EVEN";
      :epic_code = 624S; // short

    short scan(scan=4644);
      :units = "scan number";
      :type = "EVEN";

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

    float headangle(scan=4644);
      :long_name = "angle of transducer head during scan";
      :units = "degrees relative to head orientation";
      :valid_range = -180.0f, 180.0f; // float
      :initial_sensor_height = 0.6f; // float
      :sensor_depth = 19.7302f; // float
      :height_depth_units = "m";
      :serial_number = "1751";
      :sensor_type = "Imagenex Model 881 Digital tilt adjusting imaging sonar";
      :_FillValue = 1.0E35f; // float
      :NOTE1 = "headangle is computed from head_pos";

    short profile_range(time=167, scan=4644);
      :long_name = "first value above threshold";
      :units = "cm";
      :valid_range = 0S, 2048S; // short
      :initial_sensor_height = 0.6f; // float
      :sensor_depth = 19.7302f; // float
      :height_depth_units = "m";
      :serial_number = "1751";
      :sensor_type = "Imagenex Model 881 Digital tilt adjusting imaging sonar";
      :_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=167, scan=4644);
      :long_name = "Head position during scan";
      :units = "numeric location";
      :valid_range = 0S, 5000S; // short
      :initial_sensor_height = 0.6f; // float
      :sensor_depth = 19.7302f; // float
      :height_depth_units = "m";
      :serial_number = "1751";
      :sensor_type = "Imagenex Model 881 Digital tilt adjusting imaging sonar";
      :_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=167, points=500, scan=4644);
      :long_name = "sonar return echo intensity";
      :units = "?";
      :valid_range = 0S, 252S; // short
      :initial_sensor_height = 0.6f; // float
      :sensor_depth = 19.7302f; // float
      :sensor_type = "Imagenex Model 881 Digital tilt adjusting imaging sonar";
      :height_depth_units = "m";
      :serial_number = "1751";
      :_FillValue = -32767S; // short
      :scale_factor = 1S; // short
      :NOTE1 = "raw image is matrix of return amplitudes as returned by logger";

    short nDataBytes(scan=4644);
      :long_name = "number of data bytes/scan";
      :units = "count";
      :valid_range = 0S, 550S; // short
      :initial_sensor_height = 0.6f; // float
      :sensor_depth = 19.7302f; // float
      :height_depth_units = "m";
      :serial_number = "1751";
      :sensor_type = "Imagenex Model 881 Digital tilt adjusting imaging sonar";
      :_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 = "30-Apr-2012 15:58:40";
  :DATA_TYPE = "TIME";
  :DATA_SUBTYPE = "MOORED";
  :DATA_ORIGIN = "USGS WHSC Sed Trans Group";
  :EXPERIMENT = "Fire Island 2012";
  :PROJECT = "USGS Coastal Marine Geology Program";
  :MOORING = "921";
  :DELTA_T = "3600";
  :COMPOSITE = 0; // int
  :DATA_CMNT = " ";
  :POS_CONST = 0; // int
  :DEPTH_CONST = 0; // int
  :WATER_MASS = "?";
  :DESCRIPTION = "Site 1 WHSC minipod, ridge";
  :DRIFTER = 0; // int
  :history = "Sonar data written to NetCDF by mkrawcdf, SVN $Revision: 1741 $, using Matlab 7.11.1.866 (R2010b) Service Pack 1; Sonar data downloaded from instrument";
  :start_time = "26-Jan-2012 03:45:00";
  :stop_time = "09-Mar-2012 17:08:00";
  :latitude = 40.604713f; // float
  :longitude = -73.108275; // double
  :magnetic_variation = -13.5f; // float
  :INST_TYPE = "Imagenex Model 881 Digital tilt adjusting imaging sonar";
  :Conventions = "PMEL/EPIC";
  :platform_type = "tripod";
  :SciPi = "J.C. Warner";
  :COORD_SYSTEM = "GEOGRAPHIC";
  :WATER_DEPTH = 20.3302f; // float
  :WATER_DEPTH_NOTE = "depth from bridge fathometer";
  :Deployment_date = "26-Jan-2012";
  :Recovery_date = "19-Apr-2012";
  :Data_Cmnt = "none";
  :metadata_author = "Ellyn Montgomery, USGS";
  :SonartoAnimate = "fan";
  :Height = 0.6f; // float
  :FirstSonarDay = "26-Jan-2012";
  :LastSonarDay = "19-Apr-2012";
  :RootDataDir = "C:\\home\\data\\FI2012\\sonar_post\\WHSC_logger\\raw";
  :sweeps = 2.0f; // float
  :datayear = 2012.0f; // float
  :serial_number = "1751";
  :VAR_DESC = "points:scans:head_pos:Headangle:nDataBytes:profile_range:raw_image";
  :HeadID = 16.0; // double
  :Range = 5.0; // double
  :RevHold = "Reverse Step Direction";
  :MasterSlave = "Send Data Slave Mode";
  :StartGain = 20.0; // double
  :LOGF = 20.0; // double
  :Absorption = 0.06; // double
  :TrainAngle = 0.0; // double
  :SectorWidth = 348.0; // double
  :StepSize = 0.15000000000000568; // double
  :PulseLength = 10.0; // double
  :DataPoints = 500.0; // double
  :DataBits = 8.0; // double
  :UpBaud = 6.0; // double
  :Profile = "OFF";
  :Calibrate = "Calibrate";
  :SwitchDelay = 2.0; // double
  :RangeOffset = 0.0; // double
  :StepDirection = 0.0; // double
  :MoveRelative = 0.0; // 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";
}