Data from the Surface Wave Instrument Float with Tracking (SWIFT) are calculated as 10-minute ensembles and stored in a single structure in Matlab. The structure is a collection of individual structures, with data for each 10-minute ensemble. Use square brackets to index all ensembles, i.e.: >> plot([SWIFT.time],[SWIFT.sigwaveheight],'x') The full variable list and units are as follows: SWIFT.uplooking.tkedissipationrate: vertical profiles of turbulent dissipation rate in W/kg (= m^2 / s^3) beneath the wave-following free surface. SWIFT.uplooking.z: depth bins, in meters, for the tke dissipation rate profiles SWIFT.downlooking.velocityprofile: vertical profiles of horizontal velocity magnitude, in m/s, relative to the float (not corrected for drift) SWIFT.downlooking.z: depth bins, in meters, for the velocity profiles SWIFT.winddirT: true wind direction, in degrees FROM North SWIFT.winddirTstddev: standard deviation of true wind direction, in degrees SWIFT.windspd: wind speed, in m/s, at 1 m height above the wave-following surface SWIFT.windspdstddev: standard deviation, in m/s, of wind speed SWIFT.time: UTC timestamp in MATLAB datenum format (serial days since 0 Jan 0000) SWIFT.date: human readable date as day, month, year SWIFT.airtemp: air temperature, in deg C, at 1 m height above the wave-following surface SWIFT.airtempstddev: standard deviation of air temperature, in deg C SWIFT.sigwaveheight: significant wave height, in meters SWIFT.peakwaveperiod: peak of period orbital velocity spectra (note convention is usually wave height spectrum) SWIFT.peakwavedirT: wind direction, in degrees FROM North SWIFT.wavespectra.energy: wave energy spectral density, in m^2/Hz, as a function of frequency. Note that this is derived from orbital motions and is thus insensitive to low-energy swell conditions. The technique is best suited to measuring short wind waves. SWIFT.wavespectra.freq: spectral frequencies, in Hz SWIFT.wavespectra.a1: normalized spectral directional moment (positive east) SWIFT.wavespectra.b1: normalized spectral directional moment (positive north) SWIFT.wavespectra.a2: normalized spectral directional moment (east-west) SWIFT.wavespectra.b2: normalized spectral directional moment (north-south) SWIFT.lat: latitude in decimal degrees SWIFT.lon: longitude in decimal degrees SWIFT.watertemp: water temperature, in deg C, at 0.5 m below the surface SWIFT.salinity: water salinity, in PSU, at 0.5 m below the surface SWIFT.puck: three color channels of a WetLabs puck flourometer SWIFT.driftdirT: drift direction TOWARDS, in degrees True (equivalent to "course over ground") SWIFT.dirftspd: drift speed in m/s (equivalent to "speed over ground") SWIFT.z: reconstruction (via post-processing IMU data) of vertical displacements at 25 Hz SWIFT.x: reconstruction (via post-processing IMU data) of horizontal east-west displacements at 25 Hz SWIFT.y: reconstruction (via post-processing IMU data) of horizontal north-south displacements at 25 Hz SWIFT.u: east-west GPS velocities at 4 Hz SWIFT.v: north-south GPS velocities at 4 Hz