netcdf frf/projects/Dunex/UW_drifters/mission_2.nc {
  dimensions:
    time = 5761;
    trajectory = 3;
    single_value = 1;
  variables:
    double time(time=5761);
      :units = "seconds since 1970-01-01 00:00:00";
      :calendar = "gregorian";
      :standard_name = "time";
      :long_name = "time";

    int trajectory(trajectory=3);
      :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=3, time=5761);
      :data_level = "Level 1";
      :coordinates = "time latitude longitude";
      :axis = "Y";
      :units = "degrees_north";
      :standard_name = "latitude";

    double longitude(trajectory=3, time=5761);
      :coordinates = "time latitude longitude";
      :axis = "X";
      :standard_name = "longitude";
      :units = "degrees_east";
      :data_level = "Level 1";

    double acceleration_x_body(trajectory=3, time=5761);
      :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=3, time=5761);
      :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=3, time=5761);
      :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=3, time=5761);
      :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=3, time=5761);
      :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=3, time=5761);
      :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=3, time=5761);
      :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=3, time=5761);
      :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=3, time=5761);
      :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=3, time=5761);
      :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=3, time=5761);
      :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=3, time=5761);
      :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=3, time=5761);
      :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=3, time=5761);
      :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=3, time=5761);
      :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=3, time=5761);
      :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=3, time=5761);
      :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=3, time=5761);
      :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 2";
  :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 01:09:44.362636 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 = "Alex de Klerk, Sean McGill, Christine Baker, EJ Rainville";
  :contributor_role = "Data Collectors";
  :deployment_method = "surf board";
  :array_type = "clusters and people watched them to make sure they don\'t drift too far";
  :mission_start_time = "2021-10-05T14:42:00";
  :mission_end_time = "2021-10-05T14:50:00";
  :deployment_notes = "\"8:53 - 003 isn\'t getting GPS signal and 006 is not able to initialize the modem\n9:00 - 003 has gotten GPS signal and 006 has initialized the modem after a reboot\n10:30 - micros deployed with a strong northerly alongshore current\n10:38 - Christine reports feeling current reversals while swimming in bar trough\n10:45 - micros are reset close to the original location\n11:00 - All micros Received from first deployment but entered surf zone and exited during send window\n11:10 - All micros headed back out in the same array\n11:17 - All micros enter the whitewater\n11:25 - All micros are retrieved\n11:35 - All micros headed back out \n11:40 - All micros in the water\n11:55 - All micros retrieved\"";
  :data_cleaning_notes = "Mission 2(Cleaned on 02/24/22): Adjusted start time from 2021-10-05T14:30:00 to 2021-10-05T14:41:00 since the microSWIFTs were still on surfboards until this point.\n\t\t\t\tAdjusted end time from 2021-10-05T16:00:00 to 2021-10-05T14:50:00 since all of the microSWIFTs have reached the beach at this point. \n\t\t\t\tMasked microSWIFT 4 from the start to index 200 since it was still on a surfboard as seen by smaller signals then a large spike in acceleration as it is thrown in.\n\t\t\t\tMasked microSWIFT 5 from the start to index 200 since it was still on a surfboard as seen by smaller signals then a large spike in acceleration as it is thrown in.\n\t\t\t\tMasked microSWIFT 3 from the start to index 200 since it was still on a surfboard as seen by smaller signals then a large spike in acceleration as it is thrown in.";
}