Level 3 data (shear probes)
From Atomix
Level 3 data (shear probes)
Level 3 data contains the raw and cleaned spectra derived from level 2 data. 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 short name | description |
|---|---|
| TIME_SPECTRA | Time axis for the spectral estimates |
| WAVENUMBER | Wavenumber for spectral estimates |
| N_SHEAR_SENSORS | number of shear channel |
| N_***_SENSORS | number of *** channel (such as acceleration and vibration) |
Required Variables
| Parameter Name | Standard Name | Units of measurement | dimension |
|---|---|---|---|
| TIME | time | YYYY-MM-DDT00:00:00Z | TIME_SPECTRA |
| SECTION_NUMBER | dimensionless | TIME_SPECTRA | |
| SH_SPEC | shear_probe_spectrum | s-2 cpm-1 | [TIME_SPECTRA, WAVENUMBER, N_SHEAR_SENSORS] |
| KCYC | Cyclic wavenumber | cpm | WAVENUMBER |
Optional Level 3 Variables
| Parameter Name | Standard Name | Units of measurement | dimension |
|---|---|---|---|
| PSPD_REL | platform_speed_wrt_sea_water | m s-1 | TIME_SPECTRA |
| PRES | water_pressure | dbar | TIME_SPECTRA |
| SH_SPEC_CLEAN | shear_probe_spectrum_clean | s-2 cpm-1 | [TIME_SPECTRA, WAVENUMBER, N_SHEAR_SENSORS] |
| A_SPEC | acceleration_sensor_spectrum | m2 s-4 cpm-1 | [TIME_SPECTRA, WAVENUMBER, N_ACCEL_SENSORS] |
| AP_SPEC | vibration_sensor_spectrum | NA | [TIME_SPECTRA, WAVENUMBER, N_VIB_SENSORS] |
| SH_A_SPEC | shear_and_acceleration_cross-spectral_matrix | [TIME_SPECTRA, WAVENUMBER, N_ACCEL_SENSORS*N_SHEAR_SENSORS] | |
| SH_AP_SPEC | shear_and_vibration_cross-spectral_matrix | [TIME_SPECTRA, WAVENUMBER, N_VIB_SENSORS*N_SHEAR_SENSORS] |
