netcdf ocean-time-series/Stellwagen/FI14/9894fan_raw.nc {
  dimensions:
    time = UNLIMITED;   // (260 currently)
    scan = 4644;
    points = 500;
  variables:
    int time(time=260);
      :units = "EPIC Julian Day";
      :type = "EVEN";
      :epic_code = 624S; // short

    int time2(time=260);
      :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 = 0.562f; // float
      :sensor_depth = 10.938f; // 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=260, scan=4644);
      :long_name = "first value above threshold";
      :units = "cm";
      :valid_range = 0S, 2048S; // short
      :initial_sensor_height = 0.562f; // float
      :sensor_depth = 10.938f; // 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=260, scan=4644);
      :long_name = "Head position during scan";
      :units = "numeric location";
      :valid_range = 0S, 5000S; // short
      :initial_sensor_height = 0.562f; // float
      :sensor_depth = 10.938f; // 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=260, points=500, scan=4644);
      :long_name = "sonar return echo intensity";
      :units = "?";
      :valid_range = 0S, 252S; // short
      :initial_sensor_height = 0.562f; // float
      :sensor_depth = 10.938f; // 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 = 0.562f; // float
      :sensor_depth = 10.938f; // 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 12:34:25";
  :DATA_TYPE = "TIME";
  :DATA_SUBTYPE = "MOORED";
  :DATA_ORIGIN = "USGS WHCMSC Sediment Transport Group";
  :EXPERIMENT = "Fire Island 2014";
  :PROJECT = "USGS Coastal Marine Geology Program";
  :MOORING = "989";
  :DELTA_T = "28800";
  :COMPOSITE = 0; // int
  :DATA_CMNT = "";
  :POS_CONST = 0.0f; // float
  :DEPTH_CONST = 0.0f; // float
  :WATER_MASS = "?";
  :DESCRIPTION = "Site 2";
  :DRIFTER = 0.0f; // float
  :history = "Trimmed using trunc_cdfNative,  SVN $Revision: 3342 $ to select records in the range 10 to 269.  :Sonar data written to NetCDF by mkrawcdf, SVN $Revision: 4353 $, using Matlab 7.14.0.739 (R2012a); Sonar data downloaded from instrument";
  :start_time = "07-Feb-2014 20:57:00";
  :stop_time = "05-May-2014 20:58:00";
  :latitude = 40.62441f; // float
  :longitude = -73.19614f; // float
  :magnetic_variation = -13.42f; // 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 = 11.5f; // 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 = "fan";
  :Height = 0.562f; // float
  :FirstSonarDay = "4-Feb-2014";
  :LastSonarDay = "5-May-2014";
  :RootDataDir = "C:\\home\\data\\proc\\FI14\\9893whlogger\\RAW\\";
  :sweeps = 2.0f; // float
  :OperatingFreq = "1.33MHz";
  :datayear = 2014.0f; // 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 = 16.0; // 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
  :OperatingFrequency = "1330 kHz";
  :HeadType = "IGX";
  :NDataBytes = 500.0; // double
  :NReturnBytes = 513.0; // double
  :NOTE = "vector variables combined from scan headers; names match Imagenex documentation of headers";
}