netcdf frf/oceanography/waves/xp125m/xp125m.ncml {
  dimensions:
    station_name_length = 35;
    waveFrequency = 62;
    time = 20865;
  variables:
    char station_name(station_name_length=35);
      :units = ;
      :long_name = "station name";
      :cf_role = "timeseries_id";
      :short_name = "station_name";
      :_ChunkSizes = 35U; // uint

    double latitude;
      :_FillValue = -999.0; // double
      :units = "degrees_north";
      :standard_name = "latitude";
      :long_name = "Latitude";
      :short_name = "Lon";

    double longitude;
      :_FillValue = -999.0; // double
      :units = "degrees_east";
      :standard_name = "longitude";
      :long_name = "Longitude";
      :short_name = "Lon";

    float nominalDepth;
      :_FillValue = -999.0f; // float
      :units = "m";
      :long_name = "Nominal bottom vertical location from NAVD88";
      :short_name = "Bottom Elevation";

    float gaugeElevation;
      :_FillValue = -999.0f; // float
      :units = "m";
      :description = "Gauge Vertical Position from NAVD88";
      :long_name = "Gauge Elevation";
      :short_name = "Gauge Elevation";

    float waveFrequency(waveFrequency=62);
      :_FillValue = -999.0f; // float
      :units = "s-1";
      :standard_name = "wave_frequency";
      :long_name = "Spectral Band Center Frequency";
      :short_name = "Frequency";
      :_ChunkSizes = 62U; // uint

    double time(time=20865);
      :_FillValue = -999.0; // double
      :units = "seconds since 1970-01-01 00:00:00";
      :standard_name = "time";
      :long_name = "UTC Sample Time";
      :calendar = "gregorian";
      :short_name = "time";
      :_ChunkSizes = 1000U; // uint

    float depth(time=20865);
      :standard_name = "sea_floor_depth_below_sea_surface";
      :long_name = "Water Depth (positive) Using Pressure Data";
      :description = "Sensor depth estimate from gauge mean pressure, barometrically corrected ";
      :short_name = "Depth";
      :_FillValue = -999.0f; // float
      :units = "m";
      :_ChunkSizes = 1U; // uint

    float waveHs(time=20865);
      :_FillValue = -999.0f; // float
      :units = "m";
      :standard_name = "sea_surface_wave_significant_height";
      :long_name = "Significant Wave Height";
      :description = "Significant wave height for frequencies between 0.04 and 0.5 Hz";
      :short_name = "Wave Height";
      :coordinates = "lat lon";
      :_ChunkSizes = 1U; // uint

    float waveHsIg(time=20865);
      :_FillValue = -999.0f; // float
      :units = "m";
      :long_name = "Significant Wave Height Infragravity Band";
      :description = "Significant wave height for frequencies less than 0.04 Hz";
      :short_name = "Wave Height Infragravity Band";
      :coordinates = "lat lon";
      :_ChunkSizes = 1U; // uint

    float waveTp(time=20865);
      :_FillValue = -999.0f; // float
      :units = "s";
      :standard_name = "sea_surface_wave_frequency_at_variance_spectral_density_maximum";
      :description = "Period of a parobolic fit to the peak of the energy density spectrum using the peak and two surrounding points.  Computed for wave periods between 2 and 25 seconds";
      :long_name = "Peak spectral period Between 2 and 20 seconds";
      :coordinates = "lat lon";
      :short_name = "Tp";
      :_ChunkSizes = 1U; // uint

    float waveTpfb(time=20865);
      :_FillValue = -999.0f; // float
      :units = "s";
      :standard_name = "sea_surface_wave_frequency_at_variance_spectral_density_maximum";
      :description = "Period of a parobolic fit to the peak of the energy density spectrum using the peak and two surrounding points. Computed over entire spectrum";
      :long_name = "Peak spectral period over full spectrum";
      :coordinates = "lat lon";
      :short_name = "Tpfb";
      :_ChunkSizes = 1U; // uint

    float waveTm(time=20865);
      :_FillValue = -999.0f; // float
      :units = "s";
      :standard_name = "sea_surface_wave_mean_period_from_variance_spectral_density_inverse_frequency_moment";
      :description = "Period for the mean of the energy density spectrum";
      :long_name = "Mean Spectral Period";
      :coordinates = "lat lon";
      :short_name = "Tm";
      :_ChunkSizes = 1U; // uint

    float waveTm1(time=20865);
      :_FillValue = -999.0f; // float
      :units = "s";
      :standard_name = "sea_surface_wave_mean_period_from variance_spectral_density_first_frequency_moment";
      :description = "Period for the 1st moment mean of the energy density spectrum";
      :long_name = " 1st Moment Mean Spectral Period";
      :coordinates = "lat lon";
      :short_name = "Tm1";
      :_ChunkSizes = 1U; // uint

    float waveTm2(time=20865);
      :_FillValue = -999.0f; // float
      :units = "s";
      :standard_name = "sea_surface_wave_mean_period_from variance_spectral_density_second_frequency_moment";
      :description = "Period for the 2nd moment mean of the energy density spectrum";
      :long_name = " 2nd Moment Mean Spectral Period";
      :coordinates = "lat lon";
      :short_name = "Tm2";
      :_ChunkSizes = 1U; // uint

    float pressureEnergyDensity(time=20865, waveFrequency=62);
      :_FillValue = -999.0f; // float
      :units = "m2 s";
      :description = "Presure wave variance spectral density, not corrected for attenuation";
      :long_name = "Band Energy Density";
      :short_name = "1D Wave Energy";
      :_ChunkSizes = 1U, 62U; // uint

    float waveEnergyDensity(time=20865, waveFrequency=62);
      :_FillValue = -999.0f; // float
      :units = "m2 s";
      :standard_name = "sea_surface_wave_variance_spectral_density";
      :long_name = "Band Energy Density";
      :short_name = "1D Wave Energy";
      :_ChunkSizes = 1U, 62U; // uint

    float depthElevation(time=20865);
      :_FillValue = -999.0f; // float
      :units = "m";
      :long_name = "Bottom Location From Sea Surface (NAVD88)";
      :description = "Bottom vertical location from NAVD88 computed from the surveyed gauge depth and gauge height off the bottom based on altimeter or survey data, or nominal data.  See depthSource.)";
      :short_name = "BottomZ";
      :coordinates = "lat lon";
      :_ChunkSizes = 1U; // uint

    double depthTime(time=20865);
      :_FillValue = -999.99; // double
      :units = "seconds since 1970-01-01 00:00:00";
      :long_name = "Time of depth estimate";
      :description = "Time of depth estimate from altimeter, or survey, or initial deployment (nominal depth)";
      :short_name = "BottomZ";
      :coordinates = "lat lon";
      :_ChunkSizes = 1U; // uint

    byte sourceZ(time=20865);
      :_FillValue = -99B; // byte
      :units = ;
      :long_name = "Source of determining bottom location relative to sensor (0=nominal depth, 1=altimeter, 2=bathymetric survey)";
      :short_name = "BottomZ";
      :coordinates = "lat lon";
      :_ChunkSizes = 1U; // uint

    byte qcFlagE(time=20865);
      :_FillValue = -99B; // byte
      :units = ;
      :description = "Realtime QC flags for Spectral Estimates";
      :long_name = "Quality control flag value for energy estimates";
      :flag_meanings = "1=passed, 2=not set, 3=questionable, 4=failed";
      :coordinates = "lat lon";
      :short_name = "QC_flag_E";
      :_ChunkSizes = 1U; // uint

    float waterLevel(time=20865);
      :_FillValue = -999.0f; // float
      :units = "m";
      :standard_name = "water_surface_height_above_reference_datum";
      :long_name = "Water Level Height";
      :description = "Water level based on sensor mean pressure and surveyed location of sensor (NAVD88), barometrically corrected, see mbar value";
      :short_name = "Water Level";
      :coordinates = "time lat lon";
      :_ChunkSizes = 1U; // uint

    float airPressure(time=20865);
      :_FillValue = -999.0f; // float
      :units = "mbar";
      :standard_name = "air_pressure";
      :long_name = "Barometric Pressure";
      :description = "Atmospheric pressure at sea level measured with a shore based sensor, averaged over wave record";
      :short_name = "Barom Pressure";
      :coordinates = "time lat lon";
      :_ChunkSizes = 1U; // uint

  // global attributes:
  :featureType = "timeSeries";
  :title = "FRF Paros Cross-Shore (125m) Sensor";
  :summary = "USACE/CHL/COAB collected non-directional wave data using a Paroscientific pressure sensor the FRF (Duck, NC) cross-shore array (FRF cross-shore coordinates X=124.42, Y=939.26 m).   The sensor was buried in the beach to help reduce pressure bias from currents (Bernouli  effect).  Record are collected hourly, 34 minutes with long, starting at the top of the hour.  Data were sampled at 2 Hz.  Frequency spectra were computed using 512 point  ensembles and the Welch method of 50% ensemble overlap.  Spectra were smoothed with  3-point frequency band averaging then interpolated to 0.0075 Hz bands between 0.04 and  0.5 Hz. Paros frequency signals are converted to analog voltage using COAB frequency to voltage converters and collected with a 16-bit A/D data logger. If the Paros gauge is believed to be buried less than 15cm (or not buried) then a linear  wave theory pressure correction (PRF) is applied to the pressure spectra to get surface  variance spectra.  If the gauge is believed buried by more than 15 cm then a PRF for  burried sensors was applied using the Raubenheimer method (Raubenheimer, B., Elgar, S.,  and Guza R.T. 1998.  Journal or Waterway, Port, Coastal, and Ocean Engineering.  Vol.  124, No. 3). PRF corrections exceeding 100x in energy are not applied at the high frequency  end of the spectra. Data that use the survey or nominal depths for pressure correcting should be considered  suspect (see the Zsource and depthTime variables).\n";
  :history = "2015-10-02:dataset created";
  :source = "In situ observations from FRF-ocean_waves_xparos125m_YYYYMM.mat";
  :sourceUrl = "(local files)";
  :standard_name_vocabulary = "CFv25";
  :Metadata_Conventions = "Unidata Dataset Discovery v1.0, CF-1.6";
  :metadata_link = "N/A";
  :Conventions = "CF-1.6";
  :creator_name = "USACE/CHL/COAB";
  :creator_url = "http://frf.usace.army.mil";
  :creator_email = "frfwebmaster@usace.army.mil";
  :license = "These data may be redistributed and used without restriction. Data are intended for scholarly use by the research community, with the express agreement that users will properly acknowledge the USACE Field Research Facility and the supporting investigator(s). Use or reproduction of these data for commercial purposes is prohibited without prior written permission.";
  :keywords_vocabulary = "Global Change Master Directory (GCMD) Earth Science Keywords; CF Standard Name Table (v23, 23 March 2013)";
  :keywords = "Oceans > Ocean Waves > Wave Frequency, Oceans > Ocean Waves > Wave Height, Oceans > Ocean Waves > Wave Period, Oceans > Ocean Waves > Wave Spectra, DOD > DOD/USARMY/USACE/CHL/FRF > Field Research Facility, Coastal And Hydraulics Laboratory,U. S. Army Corps Of Engineers, U.S. Army, U. S. Department Of Defense, sea_surface_wave_variance_spectral_density, sea_surface_wave_significant_height\"";
  :processing = "realtime";
  :organization = "U.S. Army Corps of Engineers (USACE), Engineering Research and Development Center (ERDC), Coastal Hydraulics Laboratory (CHL), Observation and Analysis Branch (COAB)";
  :publisher_url = "http://frf.usace.army.mil";
  :infoUrl = "http://frf.usace.army.mil";
  :publisher_email = "frfwebmaster@usace.army.mil";
  :publisher_name = "USACE/CHL/COAB";
  :format_version = "v1.0";
  :institution = "USACE/CHL/COAB";
  :contact = "USACE/CHL/COAB";
  :contact_info = "USACE/CHL/COAB";
  :contact_role = "Owner";
  :contributor_name = "USACE/CHL/COAB";
  :contributor_role = "USACE/CHL/COAB";
  :naming_authority = "FRF";
  :origin = "USACE/CHL/COAB";
  :date_created = "2018-09-30";
  :date_issued = "2018-09-30";
  :acknowledgement = "Data are provided by the Coastal Observations and Analysis Branch, Coastal and Hydraulics Laboratory, US Army Corps of Engineers, Duck, North Carolina.";
  :project = "USACE/FRF observations";
  :id = "FRF-ocean_waves_xp125m";
  :processing_level = "L1";
  :geospatial_vertical_units = "m";
  :geospatial_vertical_resolution = 0.0; // double
  :geospatial_vertical_min = -1.8; // double
  :geospatial_vertical_max = -1.8; // double
  :geospatial_vertical_origin = "NAVD88";
  :geospatial_lat_min = 36.1859903; // double
  :geospatial_lat_max = 36.1859903; // double
  :geospatial_lat_units = "degrees_north";
  :geospatial_lon_min = -75.7516238; // double
  :geospatial_lon_max = -75.7516238; // double
  :geospatial_lon_units = "degrees_east";
  :geospatial_vertical_positive = "up";
  :time_coverage_start = "2018-09-30T23:00:00";
  :time_coverage_end = "2018-09-30T23:00:00";
  :deployment_start = "2015-10-02T21:00:00Z";
  :platform = "FRF Cross-shore pipe 125m";
  :instrument = "Paroscientific pressure gauge, xp125m";
  :cross_shore_angle_units = "NA";
  :cross_shore_angle_description = "NA";
  :cross_shore_angle = "NA";
}