Level 3 data (shear probes): Difference between revisions
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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]]. | Level 3 data contains the raw (and optionally cleaned) [[Spectrum|spectra]] derived from level 2 time series and is saved in the NetCDF group "L3_spectra". 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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! Dimension name !! description | ! Dimension name !! description | ||
|- | |- | ||
| TIME_SPECTRA || length of the record of average times of spectral segments | | TIME_SPECTRA || length of the record of average times of spectral segments | ||
|- | |- | ||
| | | N_WAVENUMBER || length of the wavenumber array | ||
|- | |- | ||
|N_SHEAR_SENSORS || number of shear channels (shear sensors) | | N_SHEAR_SENSORS || number of shear channels (shear sensors) | ||
|- | |- | ||
|N_***_SENSORS || number of *** channels ( | | N_***_SENSORS || number of *** channels | ||
|- | |||
| N_SH_ACC_SPEC || number of shear-acceleration cross spectra | |||
|- | |||
| N_SH_VIB_SPEC || number of shear-vibration cross spectra | |||
|- | |||
| N_GLOBAL_VALUES <math>^a</math> || dimension for 1 data point (for the entire analysis) | |||
|} | |} | ||
</div> | </div> | ||
= | <math>^a</math> Dimension for variables of the size 1x1 for variables such as N_FFT_SEGMENTS and DOF. <br> | ||
=Variables= | |||
<div class="mw-collapsible mw-expand" data-collapsetext="Collapse" data-expandtext="Expand"> | <div class="mw-collapsible mw-expand" data-collapsetext="Collapse" data-expandtext="Expand"> | ||
<br> | <br> | ||
{| class="wikitable sortable" | {| class="wikitable sortable" | ||
|- | |- | ||
! Parameter Name !! Standard Name !! Units of measurement !! dimension | ! Parameter Name !! Req.<math>^a</math> !! Standard Name !! Units of measurement !! dimension | ||
|- | |- | ||
| TIME || time || | | TIME || R || time || [http://cfconventions.org/cf-conventions/cf-conventions CF-Convention]<math>^b</math> || TIME_SPECTRA | ||
|- | |- | ||
| SECTION_NUMBER || || | | SECTION_NUMBER || R || unique_identifier_for_each_section_ of_data_from_timeseries || - || TIME_SPECTRA | ||
|- | |- | ||
| PSPD_REL || | | PSPD_REL || R || platform_speed_wrt_[sea]<math>^c</math>_water || m s-1 || TIME_SPECTRA | ||
|- | |- | ||
| SH_SPEC || shear_probe_spectrum || s-2 cpm-1 || | | SH_SPEC || R || shear_probe_spectrum || s-2 cpm-1 || TIME_SPECTRA, N_WAVENUMBER, N_SHEAR_SENSORS | ||
|- | |- | ||
| KCYC || | | KCYC || R || cyclic_wavenumber || cpm || TIME_SPECTRA, N_WAVENUMBER | ||
|- | |- | ||
| | | SH_SPEC_CLEAN || R || shear_probe_spectrum_clean || s-2 cpm-1 || TIME_SPECTRA, N_WAVENUMBER, N_SHEAR_SENSORS | ||
| | |- | ||
| N_FFT_SEGMENTS || R || number_of_fft_segments || - || N_GLOBAL_VALUES | |||
|- | |||
| N_VIB_SENSORS || R || number_of_vibration_sensors_used_for_cleaning_spectra || - || N_GLOBAL_VALUES | |||
|- | |||
| SPEC_STD || R || standard_deviation_uncertainty_of_shear_spectrum || - || N_GLOBAL_VALUES | |||
|- | |- | ||
| PRES || HR || [sea]<math>^c</math>_water_pressure || dbar || TIME_SPECTRA | |||
|- | |- | ||
| | | ACC_SPEC || O || acceleration_sensor_spectrum || m2 s-4 cpm-1 || TIME_SPECTRA, N_WAVENUMBER, N_ACCEL_SENSORS | ||
|- | |- | ||
| | | VIB_SPEC || O || vibration_sensor_spectrum || - || TIME_SPECTRA, WAVENUMBER, N_VIB_SENSORS | ||
|- | |- | ||
| | | SH_VIB_SPEC || O || shear_and_vibration_cross-spectral_matrix || - || TIME_SPECTRA, N_WAVENUMBER, N_SH_VIB_SPEC | ||
|- | |- | ||
| | | SH_ACC_SPEC || O || shear_and_acceleration_cross-spectral_matrix || - || TIME_SPECTRA, N_WAVENUMBER, N_SH_ACC_SPEC | ||
|- | |- | ||
| | | DOF || O || degrees_of_freedom_of_spectrum || - || N_GLOBAL_VALUES | ||
|} | |} | ||
<math>^a</math>: Code for the requirement of variable, R: Required, HR: Highly recommended, O: Optional | |||
<br><math>^b</math>: Unit and offset need to be compatible with the Climate and Forecast (CF)-convention | |||
<br><math>^c</math>: User can choose between water or sea_water depending on the environment | |||
</div> | </div> | ||
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----- | ----- | ||
Return [[Dataset requirements for shear probes]]<br> | Return [[Dataset requirements for shear probes]]<br> | ||
go to previous: [[Level 2 data (shear probes)| Level 2 data]]<br> | |||
go to next: [[Level 4 data (shear probes)| Level 4 data]]. | go to next: [[Level 4 data (shear probes)| Level 4 data]]. | ||
Latest revision as of 19:56, 24 May 2024
Level 3 data contains the raw (and optionally cleaned) spectra derived from level 2 time series and is saved in the NetCDF group "L3_spectra". 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
[math]\displaystyle{ ^a }[/math] Dimension for variables of the size 1x1 for variables such as N_FFT_SEGMENTS and DOF.
Variables
Return Dataset requirements for shear probes
go to previous: Level 2 data
go to next: Level 4 data.
