netcdf ocean-time-series/Stellwagen/FI14/9924hffan_raw.nc {
  dimensions:
    time = UNLIMITED;   // (2160 currently)
    scan = 1160;
    points = 500;
  variables:
    int time(time=2160);
      :units = "EPIC Julian Day";
      :type = "EVEN";
      :epic_code = 624S; // short

    int time2(time=2160);
      :units = "msec since 0:00 GMT";
      :type = "EVEN";
      :epic_code = 624S; // short

    short scan(scan=1160);
      :units = "scan number";
      :type = "EVEN";

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

    float headangle(scan=1160);
      :long_name = "angle of transducer head during scan";
      :units = "degrees relative to head orientation";
      :valid_range = -180.0f, 180.0f; // float
      :initial_sensor_height = 1.199f; // float
      :sensor_depth = 14.801f; // 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=2160, scan=1160);
      :long_name = "first value above threshold";
      :units = "cm";
      :valid_range = 0S, 2048S; // short
      :initial_sensor_height = 1.199f; // float
      :sensor_depth = 14.801f; // 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=2160, scan=1160);
      :long_name = "Head position during scan";
      :units = "numeric location";
      :valid_range = 0S, 5000S; // short
      :initial_sensor_height = 1.199f; // float
      :sensor_depth = 14.801f; // 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=2160, points=500, scan=1160);
      :long_name = "sonar return echo intensity";
      :units = "?";
      :valid_range = 0S, 252S; // short
      :initial_sensor_height = 1.199f; // float
      :sensor_depth = 14.801f; // 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=1160);
      :long_name = "number of data bytes/scan";
      :units = "count";
      :valid_range = 0S, 550S; // short
      :initial_sensor_height = 1.199f; // float
      :sensor_depth = 14.801f; // 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 = "18-Feb-2015 13:53:16";
  :DATA_TYPE = "TIME";
  :DATA_SUBTYPE = "MOORED";
  :DATA_ORIGIN = "USGS WHCMSC Sediment Transport Group";
  :EXPERIMENT = "Fire Island 2014";
  :PROJECT = "USGS Coastal Marine Geology Program";
  :MOORING = "992";
  :DELTA_T = "3600";
  :COMPOSITE = 0; // int
  :DATA_CMNT = "";
  :POS_CONST = 0.0f; // float
  :DEPTH_CONST = 0.0f; // float
  :WATER_MASS = "?";
  :DESCRIPTION = "Site 3";
  :DRIFTER = 0.0f; // float
  :history = "Trimmed using trunc_cdfNative,  SVN $Revision: 3342 $ to select records in the range 68 to 2227.  :Sonar data written to NetCDF by mkraw_irishffan, SVN $Revision $, using Matlab 7.14.0.739 (R2012a); ";
  :start_time = "07-Feb-2014 16:00:24";
  :stop_time = "08-May-2014 15:00:23";
  :latitude = 40.61925f; // float
  :longitude = -73.18402f; // float
  :magnetic_variation = -13.43f; // float
  :INST_TYPE = "Imagenex Model 881 Digital tilt adjusting imaging sonar";
  :Conventions = "PMEL/EPIC";
  :platform_type = "minipod tripod";
  :SciPi = "J. Warner";
  :COORD_SYSTEM = "GEOGRAPHIC";
  :WATER_DEPTH = 16.0f; // float
  :WATER_DEPTH_NOTE = "(meters), ships fathometer";
  :Deployment_date = "7-Feb-2014";
  :Recovery_date = "5-May-2014";
  :institution = "United States Geological Survey, Woods Hole Coastal and Marine Science Center";
  :institution_url = "http://woodshole.er.usgs.gov";
  :metadata_author = "Ellyn Montgomery, USGS";
  :SonartoAnimate = "hffan";
  :Height = 1.199f; // float
  :FirstSonarDay = "05-Feb-2014";
  :LastSonarDay = "15-Jun-2014";
  :RootDataDir = "C:\\home\\data\\proc\\FI14\\iris1008_hffan\\DATA\\";
  :sweeps = 1.0f; // float
  :gains = 22.0f; // float
  :start_min = 0.0f; // float
  :datayear = 2014.0f; // float
  :mkplt = "n";
  :serial_number = "1751";
  :VAR_DESC = "points:scans:head_pos:Headangle:nDataBytes:profile_range:raw_image";
  :StartGain = 22.0; // double
  :LOGF = 0.0; // double
  :Absorption = 1.7; // double
  :TrainAngle = 180.0; // double
  :SectorWidth = 348.0; // double
  :StepSize = 0.3; // double
  :PulseLength = 10.0; // double
  :Profile = "Off";
  :HeadType = "IGX";
  :HeadID = "16";
  :Range = 5.0; // double
  :NDataBytes = 500.0; // double
  :DataPoints = "500";
  :TotalBytes = 640.0; // double
  :nToRead = 513.0; // double
  :OperatingFrequency = "2250 kHz";
  :NOTE = "hffan data collected by IRIS logger";
}