Level 3 data (shear probes): Difference between revisions

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{| class="wikitable sortable"
{| class="wikitable sortable"
! Dimension short name
! Dimension name !! description
! description
|-
|-
| TIME_SPECTRA
| TIME_SPECTRA || length of the record of average times of spectral segments. This also equals time of dissipation estimates.
| Time axis for the spectral estimates
|-
|-
| WAVENUMBER
| WAVENUMBER || length of the wavenumber array
| Wavenumber for spectral estimates
|-
|-
|N_SHEAR_SENSORS
|N_SHEAR_SENSORS || number of shear channels (shear sensors)
|number of shear channels
|-
|N_***_SENSORS
|number of *** channels (such as ACC and VIB)
|-
|-
|N_***_SENSORS || number of *** channels (such as ACC and VIB)
|}
|}
</div>
</div>

Revision as of 20:14, 25 May 2022

Level 3 data contains the raw (and optionally cleaned) spectra derived from level 2 time series. Level 3 parameters are defined along a new TIME dimension, which is the average time of the individual spectral segments. The length of the TIME dimension equals the number of spectral segments. Parameter for the calculation of the spectra, e.g. segment length, are provided in the meta data.


Dimensions


Dimension name description
TIME_SPECTRA length of the record of average times of spectral segments. This also equals time of dissipation estimates.
WAVENUMBER length of the wavenumber array
N_SHEAR_SENSORS number of shear channels (shear sensors)
N_***_SENSORS number of *** channels (such as ACC and VIB)

Required Variables


Parameter Name Standard Name Units of measurement dimension
TIME time Days since YYYY-MM-DDT00:00:00Z TIME_SPECTRA
SECTION_NUMBER dimensionless TIME_SPECTRA
PSPD_REL platform_speed_wrt_sea_water m s-1 TIME_SPECTRA
SH_SPEC shear_probe_spectrum s-2 cpm-1 [TIME_SPECTRA, WAVENUMBER, N_SHEAR_SENSORS]
KCYC Cyclic wavenumber cpm WAVENUMBER
DOF degrees_of_freedom_of_spectrum - 1

Optional Level 3 Variables


Parameter Name Standard Name Units of measurement dimension
PRES water_pressure dbar TIME_SPECTRA
SH_SPEC_CLEAN shear_probe_spectrum_clean s-2 cpm-1 [TIME_SPECTRA, WAVENUMBER, N_SHEAR_SENSORS]
ACC_SPEC acceleration_sensor_spectrum m2 s-4 cpm-1 [TIME_SPECTRA, WAVENUMBER, N_ACCEL_SENSORS]
VIB_SPEC vibration_sensor_spectrum - [TIME_SPECTRA, WAVENUMBER, N_VIB_SENSORS]
SH_ACC_SPEC shear_and_acceleration_cross-spectral_matrix - [TIME_SPECTRA, WAVENUMBER, N_ACCEL_SENSORS*N_SHEAR_SENSORS]

Return Dataset requirements for shear probes
go to next: Level 4 data.

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