Level 3 data (shear probes): Difference between revisions
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Level 3 data contains the raw and cleaned [[Spectrum|spectra]] derived from level 2 | Level 3 data contains the raw (and optionally cleaned) [[Spectrum|spectra]] derived from level 2 time series. Level 3 parameters are defined along a new TIME [[Netcdf dimensions (shear probes)|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 [[Netcdf meta data (shear probes)|meta data]]. | ||
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=Dimensions= | |||
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|N_SHEAR_SENSORS | |N_SHEAR_SENSORS | ||
|number of shear | |number of shear channels | ||
|- | |- | ||
|N_***_SENSORS | |N_***_SENSORS | ||
|number of *** | |number of *** channels (such as ACC and VIB) | ||
|- | |- | ||
|} | |} | ||
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=Required Variables= | |||
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| KCYC || Cyclic wavenumber || cpm || WAVENUMBER | | KCYC || Cyclic wavenumber || cpm || WAVENUMBER | ||
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=Optional Level 3 Variables= | |||
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| SH_AP_SPEC || shear_and_vibration_cross-spectral_matrix || || [TIME_SPECTRA, WAVENUMBER, N_VIB_SENSORS*N_SHEAR_SENSORS] | | SH_AP_SPEC || shear_and_vibration_cross-spectral_matrix || || [TIME_SPECTRA, WAVENUMBER, N_VIB_SENSORS*N_SHEAR_SENSORS] | ||
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Revision as of 11:14, 7 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 short name | description |
|---|---|
| TIME_SPECTRA | Time axis for the spectral estimates |
| WAVENUMBER | Wavenumber for spectral estimates |
| N_SHEAR_SENSORS | number of shear channels |
| N_***_SENSORS | number of *** channels (such as ACC and VIB) |
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] |
