netcdf frf/projects/Dunex/UW_drifters/mission_30.nc {
  dimensions:
    time = 12961;
    trajectory = 14;
    single_value = 1;
  variables:
    double time(time=12961);
      :units = "seconds since 1970-01-01 00:00:00";
      :calendar = "gregorian";
      :standard_name = "time";
      :long_name = "time";

    int trajectory(trajectory=14);
      :cf_role = "trajectory_id";
      :long_name = "trajectory name";
      :description = "microSWIFT drift track ID. The ID number is the same as the ID number of the microSWIFT wave buoy.";

    int gps_freq(single_value=1);
      :long_name = "GPS module sampling frequency";
      :units = "s-1";

    int imu_freq(single_value=1);
      :long_name = "IMU module sampling frequency";
      :units = "s-1";

    double latitude(trajectory=14, time=12961);
      :data_level = "Level 1";
      :coordinates = "time latitude longitude";
      :axis = "Y";
      :units = "degrees_north";
      :standard_name = "latitude";

    double longitude(trajectory=14, time=12961);
      :coordinates = "time latitude longitude";
      :axis = "X";
      :standard_name = "longitude";
      :units = "degrees_east";
      :data_level = "Level 1";

    double acceleration_x_body(trajectory=14, time=12961);
      :description = "Acceleration across the major horizontal axis of the buoy in the reference frame of the buoy.";
      :coordinates = "time latitude longitude";
      :long_name = "X-axis acceleration in buoy reference frame";
      :units = "m s-2";
      :data_level = "Level 1";

    double acceleration_y_body(trajectory=14, time=12961);
      :description = "Acceleration across the minor horizontal axis of the buoy in the reference frame of the buoy.";
      :coordinates = "time latitude longitude";
      :long_name = "Y-axis acceleration in buoy reference frame";
      :units = "m s-2";
      :data_level = "Level 1";

    double acceleration_z_body(trajectory=14, time=12961);
      :description = "Acceleration across the vertical axis of the buoy in the reference frame of the buoy (positive is down).";
      :coordinates = "time latitude longitude";
      :long_name = "Z-axis acceleration in buoy reference frame";
      :units = "m s-2";
      :data_level = "Level 1";

    double rotation_rate_x(trajectory=14, time=12961);
      :units = "degrees s-1";
      :data_level = "Level 1";
      :coordinates = "time latitude longitude";
      :long_name = "X-axis gyroscope measurements in buoy reference frame";
      :description = "Rotation rate around the major horizontal axis of the buoy.";

    double rotation_rate_y(trajectory=14, time=12961);
      :data_level = "Level 1";
      :coordinates = "time latitude longitude";
      :long_name = "Y-axis gyroscope measurements in buoy reference frame";
      :description = "Rotation rate around the minor horizontal axis of the buoy.";
      :units = "degrees s-1";

    double rotation_rate_z(trajectory=14, time=12961);
      :description = "Rotation rate around the vertical axis of the buoy.";
      :units = "degrees s-1";
      :data_level = "Level 1";
      :coordinates = "time latitude longitude";
      :long_name = "Z-axis gyroscope measurements in buoy reference frame";

    double magnetic_flux_density_x(trajectory=14, time=12961);
      :data_level = "Level 1";
      :coordinates = "time latitude longitude";
      :long_name = "X-axis magnetic flux density measurements in buoy reference frame";
      :description = "Magnetic flux density along the major horizontal axis of the buoy.";
      :units = "uTesla";

    double magnetic_flux_density_y(trajectory=14, time=12961);
      :description = "Magnetic flux density along the minor horizontal axis of the buoy.";
      :units = "uTesla";
      :data_level = "Level 1";
      :coordinates = "time latitude longitude";
      :long_name = "Y-axis magnetic flux density measurements in buoy reference frame";

    double magnetic_flux_density_z(trajectory=14, time=12961);
      :coordinates = "time latitude longitude";
      :long_name = "Z-axis magnetic flux density measurements in buoy reference frame";
      :description = "Magnetic flux density along the major horizontal axis of the buoy.";
      :units = "uTesla";
      :data_level = "Level 1";

    double acceleration_ns(trajectory=14, time=12961);
      :description = "Acceleration in the North-South direction in the Earth reference frame. This is a Level 2 data product that has been rotated by the MATLAB AHRS indirect Kalman filter (https://www.mathworks.com/help/fusion/ref/ahrsfilter-system-object.html) and despiked using a PCHIP interpolation scheme(https://www.mathworks.com/help/matlab/ref/filloutliers.html).";
      :coordinates = "time latitude longitude";
      :long_name = "North-South acceleration in Earth reference frame";
      :units = "m s-2";
      :data_level = "Level 2";

    double acceleration_ew(trajectory=14, time=12961);
      :description = "Acceleration in the East-West direction in the Earth reference frame. This is a Level 2 data product that has been rotated by the MATLAB AHRS indirect Kalman filter (https://www.mathworks.com/help/fusion/ref/ahrsfilter-system-object.html) and despiked using a PCHIP interpolation scheme(https://www.mathworks.com/help/matlab/ref/filloutliers.html).";
      :units = "m s-2";
      :data_level = "Level 2";
      :coordinates = "time latitude longitude";
      :long_name = "East-West acceleration in Earth reference frame";

    double acceleration_ud(trajectory=14, time=12961);
      :description = "Acceleration in the Up-Down direction in the Earth reference frame. This is a Level 2 data product that has been rotated by the MATLAB AHRS indirect Kalman filter (https://www.mathworks.com/help/fusion/ref/ahrsfilter-system-object.html) and despiked using a PCHIP interpolation scheme(https://www.mathworks.com/help/matlab/ref/filloutliers.html). Down is Positive.";
      :long_name = "Up-Down acceleration in Earth reference frame";
      :units = "m s-2";
      :data_level = "Level 2";
      :coordinates = "time latitude longitude";

    double velocity_ew(trajectory=14, time=12961);
      :coordinates = "time latitude longitude";
      :data_level = "Level 1";
      :long_name = "East-West Velocity in Earth reference frame";
      :description = "Velocity in the East-West direction measured from the GPS module. This is a Level 1 data product that has been despiked and linearly interpolated onto the time dimension.";
      :units = "m s-1";

    double velocity_ns(trajectory=14, time=12961);
      :coordinates = "time latitude longitude";
      :long_name = "North-South Velocity in Earth reference frame";
      :description = "Velocity in the North-South direction measured from the GPS module. This is a Level 1 data product that has been despiked and linearly interpolated onto the time dimension.";
      :data_level = "Level 1";
      :units = "m s-1";

    double velocity_ud(trajectory=14, time=12961);
      :coordinates = "time latitude longitude";
      :long_name = "Up-Down Velocity in Earth reference frame";
      :description = "Velocity in the Up-Down direction integrated from the Up-Down acceleration in the Earth reference frame. This is a Level 2 data product that has been integrated, filtered and despiked. ";
      :units = "m s-1";
      :data_level = "Level 2";

    double xFRF(trajectory=14, time=12961);
      :description = "This is the cross-shore coordinate in the local FRF coordinate system. Transformed from the measured GPS locations.";
      :units = "m";
      :data_level = "Level 1";
      :coordinates = "time latitude longitude";
      :long_name = "x-coordinate in Local FRF Cartesian system";

    double yFRF(trajectory=14, time=12961);
      :long_name = "y-coordinate in Local FRF Cartesian system";
      :description = "This is the along-shore coordinate in the local FRF coordinate system. Transformed from the measured GPS locations.";
      :units = "m";
      :data_level = "Level 1";
      :coordinates = "time latitude longitude";

    double sea_surface_elevation(trajectory=14, time=12961);
      :description = "This is the computed instantaneous sea surface elevation. This is a highly computed Level 2 data product. This is computed from the rotated Up-Down acceleration, double-integrated, filtered, and despiked.";
      :data_level = "Level 2";
      :coordinates = "time latitude longitude";
      :long_name = "Instantaneous sea surface elevation";
      :units = "m";

  // global attributes:
  :title = "DUNEX microSWIFT drifter - Mission 30";
  :summary = "University of Washington - Applied Physics Lab team collected these data using microSWIFT wave buoys at the USACE Field Research Facility as part of the USCRP funded project DUNEX (During Nearshore Events Experiment). The file contains both directly measured and computed quantities from the drifting wave buoys. The collection and processing of these data is explained in the github repository at https://github.com/SASlabgroup/DUNEXMainExp along with examples of how these data can be used.";
  :institution = "University of Washington - Applied Physics Lab";
  :source = "Observations from microSWIFT drifters deployed in the DUring Nearshore Events eXperiment (DUNEX)";
  :Conventions = "CF-1.6";
  :Metadata_Conventions = "Unidata Dataset Discovery v1.0";
  :creator_country = "USA";
  :creator_email = "erainvil@uw.edu";
  :creator_name = "EJ Rainville, Jim Thomson, Melissa Moulton, and Morteza Derakhti at University of Washington - Applied Physics Lab";
  :creator_phone = "(303) 653-1226";
  :creator_sector = "academic";
  :creator_state = "Washington";
  :featureType = "trajectory";
  :cdm_data_type = "Trajectory";
  :platform = "microSWIFT wave buoy";
  :publisher_country = "USA";
  :publisher_email = "frfwebmaster@usace.army.mil";
  :publisher_name = "USACE/CHL/COAB";
  :history = "2023-01-25 01:10:01.289097 Python";
  :references = "https://github.com/SASlabgroup/microSWIFT and https://github.com/SASlabgroup/DUNEXMainExp";
  :acknowledgement = "These data were collected as part of the During Nearshore Event Experiment (DUNEX), which was facilitated by the U.S. Coastal Research Program (USCRP). We thank USCRP for their support of this effort through funding for logistics and coordination. We also thank the U.S. Army Engineer Research and Development Center\'s Field Research Facility for the use of their facility and support staff. We would like to specifically thank Patrick Dickhudt, Mike Forte, Spicer Bak, the Town of Duck surf rescue, and many others at the field research facility for all the help they provided in collection and publication of these data.";
  :license = "Data are intended for scholarly use by the research community, with the express agreement that users will properly acknowledge the U.S. Coastal Research Program (USCRP). Use or reproduction of these data for commercial purposes is prohibited without prior written permission.";
  :contributor_names = "Christine Baker, Melissa Moulton, Joe Talbert, EJ Rainville";
  :contributor_role = "Data Collectors";
  :deployment_method = "jetski";
  :array_type = "along shore lines on north side of pier";
  :mission_start_time = "2021-10-13T14:20:00";
  :mission_end_time = "2021-10-13T14:38:00";
  :deployment_notes = "No Additional Notes";
  :data_cleaning_notes = "Mission 30(Cleaned on 01/28/22): Adjusted start time from 2021-10-13T14:04:00 to 2021-10-13T14:20:00 and end time from 2021-10-13T14:53:00 to 2021-10-13T14:38:00 since all of the microSWIFTs were still on the jetski at this point which can be seen by the movement towards the north side from the pier and non-wave-like signals in the IMU.\n                                 Adjusted end time from 2021-10-13T15:15:00 to 2021-10-13T14:53:00 since all of the microSWIFTs made it to the beach in this time as seen by the signals being cut off by the spatial mask.\n                                 Removed microSWIFT 13 since it has bad gyroscope measurements(no fluctuations)\n                                 Note that microSWIFT 3 has a bad magnetometer(no fluctuations in measurements)\n                                 Mask microSWIFT 42 from index 15000 to the end since it made it to the beach but then rolled back down briefly.";
}