Level 2 data (shear probes): Difference between revisions

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Level 2 data are the full resolution, cleaned and despiked parameters from level 1. The initial data set is subdivided in [[Section|sections]] and labeled accordingly in the parameter SECTION_NUMBER with integers. Level 2 data is ready for estimating spectra. In addition to cleaned and despiked level 1 data channels, level 2 data comprises the additional parameter summarized in the table below.  
Level 2 data, that is saved in the NetCDF group "L2_cleaned", are the full resolution, cleaned and despiked parameters from level 1. The initial data set is subdivided in [[Section|sections]] and labeled accordingly in the parameter SECTION_NUMBER with integers. Level 2 data is ready for estimating spectra. In addition to cleaned and despiked level 1 data channels, level 2 data comprises the additional parameter summarized in the table below.  


It is important that the platform speed with respect to water, as used in the dissipation estimates, is included in this level. Also note that the shear probe time series (and optionally acceleration and vibration) must be cleaned and filtered as needed at this level, and will not be altered further when estimating dissipation rates.
It is important that the platform speed with respect to water, as used in the dissipation estimates, is included in this level. Also note that the shear probe time series (and optionally acceleration and vibration) must be cleaned and filtered as needed at this level, and will not be altered further when estimating dissipation rates.
On all levels, "sea_water" in the standard name can be replaced by "water" for limnologic applications.


=Dimensions=
=Dimensions=
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<br>
<br>
{| class="wikitable sortable"
{| class="wikitable sortable"
! Dimension short name !! description
! Dimension !! Description
|-
|-
| TIME <math>^a</math> || length of the record from turbulence (fast) data channels
| TIME || length of the record from turbulence (fast) data channels
|-
|-
|N_SHEAR_SENSORS ||number of shear channel (shear sensors)
|N_SHEAR_SENSORS ||number of shear channels (shear sensors)
|-
|-
|N_***_SENSORS <math>^b</math>  ||number of *** channel (sensors)
|N_***_SENSORS <math>^a</math>  ||number of *** channel (sensors)
|-
|-
|}
|}
<math>^a</math> At this level platform speed must be provided. We require that this is given at the shear probe time (not TIME_SLOW or TIME_CTD. Please interpolate if needed.
<math>^a</math> Example dimension names would be: N_VIB_SENSORS for vibration (piezo-acceleration) sensors, N_ACC_SENSORS for
<br>
vibration acceleration sensors.
<math>^b</math> Please use these examples for related sensors, e.g.:<br>
N_VIB_SENSORS for vibration (piezo-acceleration) sensors <br>
N_ACC_SENSORS for vibration acceleration sensors  
</div>
</div>


=Variables=


=Required 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
! Variable Name !! Req.<math>^a</math> !! Standard Name !! Units of measurement !! Dimensions
|-
|-
| SECTION_NUMBER || || dimensionless || TIME
| TIME || R || time || [http://cfconventions.org/cf-conventions/cf-conventions CF-Convention]<math>^b</math> || TIME
|-
|-
| TIME || time || Days since YYYY-MM-DDT00:00:00Z || TIME  
| SHEAR || R || [sea]<math>^c</math>_water_velocity_shear || s-1 || TIME, N_SHEAR_SENSORS
|-
|-
| SHEAR || sea_water_velocity_shear || s-1 || [TIME, N_SHEAR_SENSORS]  
| PSPD_REL || R || platform_speed_wrt_[sea]<math>^c</math>_water || m s-1 || TIME
|-
| PSPD_REL ||  platform_speed_wrt_sea_water || m s-1 || TIME
|}
</div>
 
=Optional Level 2 Variables=
<div class="mw-collapsible mw-expand" data-collapsetext="Collapse" data-expandtext="Expand">
<br>
{| class="wikitable sortable"
|-
|-
! Parameter Name !! Standard Name !! Units of measurement !! dimension
| SECTION_NUMBER || R || unique_identifier_for_each_section_ of_data_from_timeseries || - || TIME
|-
|-
| VIB || platform_vibration || NA || [TIME, N_VIB_SENSORS]
| VIB || HR || platform_vibration || m s-2, or -<math>^d</math> || TIME, N_VIB_SENSORS  
|-
|-
| ACC || platform_acceleration || m s-2 || [TIME <math>^a</math>, N_ACC_SENSORS]
| ACC || O || platform_acceleration || m s-2, or -<math>^d</math> || TIME , N_ACC_SENSORS  
|}
|}
<math>^a</math> If using TIME_SLOW or TIME_ACC, this must be provided in addition to the TIME record.  
<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
<br><math>^d</math>: Acceleration and vibration sensors are sometimes not calibrated and their records are used as raw values.
</div>
</div>


Latest revision as of 19:55, 24 May 2024

Level 2 data, that is saved in the NetCDF group "L2_cleaned", are the full resolution, cleaned and despiked parameters from level 1. The initial data set is subdivided in sections and labeled accordingly in the parameter SECTION_NUMBER with integers. Level 2 data is ready for estimating spectra. In addition to cleaned and despiked level 1 data channels, level 2 data comprises the additional parameter summarized in the table below.

It is important that the platform speed with respect to water, as used in the dissipation estimates, is included in this level. Also note that the shear probe time series (and optionally acceleration and vibration) must be cleaned and filtered as needed at this level, and will not be altered further when estimating dissipation rates.

Dimensions


Dimension Description
TIME length of the record from turbulence (fast) data channels
N_SHEAR_SENSORS number of shear channels (shear sensors)
N_***_SENSORS [math]\displaystyle{ ^a }[/math] number of *** channel (sensors)

[math]\displaystyle{ ^a }[/math] Example dimension names would be: N_VIB_SENSORS for vibration (piezo-acceleration) sensors, N_ACC_SENSORS for vibration acceleration sensors.

Variables


Variable Name Req.[math]\displaystyle{ ^a }[/math] Standard Name Units of measurement Dimensions
TIME R time CF-Convention[math]\displaystyle{ ^b }[/math] TIME
SHEAR R [sea][math]\displaystyle{ ^c }[/math]_water_velocity_shear s-1 TIME, N_SHEAR_SENSORS
PSPD_REL R platform_speed_wrt_[sea][math]\displaystyle{ ^c }[/math]_water m s-1 TIME
SECTION_NUMBER R unique_identifier_for_each_section_ of_data_from_timeseries - TIME
VIB HR platform_vibration m s-2, or -[math]\displaystyle{ ^d }[/math] TIME, N_VIB_SENSORS
ACC O platform_acceleration m s-2, or -[math]\displaystyle{ ^d }[/math] TIME , N_ACC_SENSORS

[math]\displaystyle{ ^a }[/math]: Code for the requirement of variable, R: Required, HR: Highly recommended, O: Optional
[math]\displaystyle{ ^b }[/math]: Unit and offset need to be compatible with the Climate and Forecast (CF)-convention
[math]\displaystyle{ ^c }[/math]: User can choose between water or sea_water depending on the environment
[math]\displaystyle{ ^d }[/math]: Acceleration and vibration sensors are sometimes not calibrated and their records are used as raw values.

Return Dataset requirements for shear probes
go to previous: Level 1 data
go to next: Level 3 data.

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