Level 3 data (shear probes): Difference between revisions

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== Level 3 data (shear probes) ==
== Level 3 data (shear probes) ==


Level 3 data contains the raw and cleaned [[Spectrum|spectra]] derived from level 2 data. Level 3 parameters are defined along a new time [[Netcdf dimensions (shear probe)|dimension]], TIME_SPECTRA, which is the average time of the individual spectral segments. The length of the TIME_SPECTRA 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]]. We repeated level 1 and 2 parameters as average over the segment length.
Level 3 data contains the raw and cleaned [[Spectrum|spectra]] derived from level 2 data. Level 3 parameters are defined along a new TIME [[Netcdf dimensions (shear probe)|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]].


{| class="wikitable sortable"
{| class="wikitable sortable"
|-
|-
! Parameter Name !! CF parameter !! Standard Name !! Units of measurement !! dimension !! Comment
! Parameter Name !! Standard Name !! Units of measurement !! dimension !! Comment
|-
|-
| FLOWPS || 0 || flow_past_sensor || m s-1 || TIME_SPECTRA ||
| FLOWPS || flow_past_sensor || m s-1 || TIME ||
|-
|-
| PRES || 1<br /> 0 || sea_water_pressure<br /> water_pressure || dbar || TIME_SPECTRA ||
| PRES || sea_water_pressure<br /> water_pressure || dbar || TIME ||
|-
|-
| TIME || 1 || time || days since 1950-01-01 00:00:00 UTC || TIME_SPECTRA ||
| TIME || time || days since 1950-01-01 00:00:00 UTC || TIME ||
|-
|-
| TEMP || 1<br /> 0 || sea_water_temperature<br /> water_temperature || degree_Celsius || TIME_SPECTRA ||
| TEMP || sea_water_temperature<br /> water_temperature || degree_Celsius || TIME ||
|-
|-
| SECTION_NUMBER || 0 || || dimensionless || TIME_SPECTRA ||
| SECTION_NUMBER || || dimensionless || TIME ||
|-
|-
| SH_SPEC || || shear_probe_spectrum || s-2 cpm-1 || [TIME_SPECTRA, WAVENUMBER, n_shear_sensors] || from shear probes (dirty)
| SH_SPEC || shear_probe_spectrum || s-2 cpm-1 || [TIME, WAVENUMBER, N_SHEAR_SENSORS] || from shear probes (dirty)
|-
|-
| SH_SPEC_CLEAN || || shear_probe_spectrum_clean || s-2 cpm-1 || [TIME_SPECTRA, WAVENUMBER, n_shear_sensors] || cleaned using [[Goodman algorithm]]
| SH_SPEC_CLEAN || shear_probe_spectrum_clean || s-2 cpm-1 || [TIME, WAVENUMBER, N_SHEAR_SENSORS] || cleaned using [[Goodman algorithm]]
|-
|-
| A_SPEC || || acceleration_sensor_spectrum || m2 s-4 cpm-1 || [TIME_SPECTRA, WAVENUMBER, n_acc_sensors] ||
| A_SPEC || acceleration_sensor_spectrum || m2 s-4 cpm-1 || [TIME, WAVENUMBER, N_ACCEL_SENSORS] ||
|-
|-
| AP_SPEC || || vibration_sensor_spectrum || NA || [TIME_SPECTRA, WAVENUMBER, n_vibration_sensors] ||
| AP_SPEC || vibration_sensor_spectrum || NA || [TIME, WAVENUMBER, N_VIB_SENSORS] ||
|-
|-
| SH_A_SPEC || || Complex cross-spectral matrix of shear and acceleration || || [TIME_SPECTRA, WAVENUMBER, ???] ||
| SH_A_SPEC || Complex cross-spectral matrix of shear and acceleration || || [TIME, WAVENUMBER, N_ACCEL_SENSORS*N_SHEAR_SENSORS] ||
|-
|-
| SH_AP_SPEC || || Complex cross-spectral matrix of shear and vibrations || || [TIME_SPECTRA, WAVENUMBER, ???] ||  
| SH_AP_SPEC || Complex cross-spectral matrix of shear and vibrations || || [TIME, WAVENUMBER, N_ACCEL_SENSORS*N_SHEAR_SENSORS] ||  
|-
|-
| KCYC || || Cyclic wavenumber || cpm || WAVENUMBER ||
| KCYC || Cyclic wavenumber || cpm || WAVENUMBER ||
|-
|-
| KMAX || || maximum_wavenumber || cpm || TIME_SPEC || maximum wavenumber for integration of shear spectrum
| KMAX || maximum_wavenumber || cpm || TIME || maximum wavenumber for integration of shear spectrum
|}
|}




[[Category: Shear probes]]
[[Category: Shear probes]]

Revision as of 05:00, 9 November 2021

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.

Parameter Name Standard Name Units of measurement dimension Comment
FLOWPS flow_past_sensor m s-1 TIME
PRES sea_water_pressure
water_pressure		 dbar TIME
TIME time days since 1950-01-01 00:00:00 UTC TIME
TEMP sea_water_temperature
water_temperature		 degree_Celsius TIME
SECTION_NUMBER dimensionless TIME
SH_SPEC shear_probe_spectrum s-2 cpm-1 [TIME, WAVENUMBER, N_SHEAR_SENSORS] from shear probes (dirty)
SH_SPEC_CLEAN shear_probe_spectrum_clean s-2 cpm-1 [TIME, WAVENUMBER, N_SHEAR_SENSORS] cleaned using Goodman algorithm
A_SPEC acceleration_sensor_spectrum m2 s-4 cpm-1 [TIME, WAVENUMBER, N_ACCEL_SENSORS]
AP_SPEC vibration_sensor_spectrum NA [TIME, WAVENUMBER, N_VIB_SENSORS]
SH_A_SPEC Complex cross-spectral matrix of shear and acceleration [TIME, WAVENUMBER, N_ACCEL_SENSORS*N_SHEAR_SENSORS]
SH_AP_SPEC Complex cross-spectral matrix of shear and vibrations [TIME, WAVENUMBER, N_ACCEL_SENSORS*N_SHEAR_SENSORS]
KCYC Cyclic wavenumber cpm WAVENUMBER
KMAX maximum_wavenumber cpm TIME maximum wavenumber for integration of shear spectrum
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