Netcdf meta data (shear probes): Difference between revisions

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== Meta data (shear probes) ==
<br>
Below we list the metadata '''required''' in a NetCDF data file, as well as the optional meta data we '''highly recommend''' that are included with the data set.


In progress
The parameter names should be used as listed (attention to underscores). The descriptions are example text or several options that are available for that parameter.
<tab class=wikitable head=top>
Parameter name brief description comment
title e.g., Vertical micostructur eprofiler data from cruise XXX
history e.g., Version 1
summary required by ACDD
comment required by CF
type
creation_time yyyy-mm-ddTHH:MM:SSZ
date_created
date_update
conventions CF-1.6, ACDD-1.3
data_mode D for delayed mode
platform_type e.g., research vessel, sub-surface glider etc
area
geospatial_lat_min
geospatial_lat_max
geospatial_lon_min
geospatial_lon_max
time_coverage_start format: yyyy-mm-ddTHH:MM:SSZ
time_coverage_end format: yyyy-mm-ddTHH:MM:SSZ
institution
principal_investigator
authors
contact
project_name
cruise Non-standard
vessel Non-standard
source From the SeaVoX Platform Categories vocabulary (L06) list, usually one of the following:  “subsurface mooring”, ”ship”, ""sub-surface gliders"", ""autonomous underwater vehicle"" (CF)
references
keywords
creator_name
creator_email
creator_url
acknowledgement
total_depth Non-standard
station_name Non-standard
fs_slow sampling freq, slow channels Non-standard
fs_fast sampling freq, fast channels Non-standard
profiling_direction Non-standard


</tab>
 
=Required Metadata=
<div class="mw-collapsible mw-expand" data-collapsetext="Collapse" data-expandtext="Expand">
<br> 
{| class="wikitable sortable"
|-
! Attibute Name !! Description !! Convention
|-
|title || A comprehensive title for the dataset including the time and location aspect || CF, ACDD
|-
|authors ||  A list of authors || ATOMIX
|-
|summary || An abstract describing the dataset || ACCD
|-
|comment|| Supplementary technical details about the collecting and processing of the dataset || CF, ACDD
|-
|platform_type || The platform from which the data are collected, e.g., sub-surface mooring, research vessel, sub-surface glider || ACDD
|-
|source || The instrument used for collecting the data. For example, vertical microstructure profiler, VMP2000 SN009 || CF, ACDD
|-
|date_created || The date on which the data were created, yyyy-mm-ddTHH:MM:SSZ || ACDD
|-
|date_modified || The date on which the data were last modified, yyyy-mm-ddTHH:MM:SSZ || ACDD
|-
|time_reference_year || Year for time reference || ATOMIX
|-
|time_coverage_start || Time of the first data point in the dataset, yyyy-mm-ddTHH:MM:SSZ || ACDD
|-
|time_coverage_end || Time of thelast data point in the dataset, yyyy-mm-ddTHH:MM:SSZ ||ACDD
|-
|geospatial_lat_min || Southern bound of data, decimal degrees, negative for South || ACDD
|-
|geospatial_lat_max || Northern bound of data, decimal degrees, negative for South || ACDD
|-
|geospatial_lon_min || Western bound of data, decimal degrees, negative for West || ACDD
|-
|geospatial_lon_max || Eastern bound of data, decimal degrees, negative for West || ACDD
|-
| fs_fast || Sampling frequency for fast (turbulence) channels || ATOMIX
|-
| fs_slow <math>^a</math> || Sampling frequency for slow channels (if exists). Alternative names could be, e.g., fs_CTD || ATOMIX
|-
| profiling_direction || Direction along which the section was collected, e.g., horizontal, vertical, or glide || ATOMIX
|-
| fft_length ||  Length of the Fast Fourier transform segments (in data points; note, fft_lengths_sec in seconds is optional) || ATOMIX
|-
| diss_length  || Length of data (in data points) used for each dissipation estimate || ATOMIX
|-
| overlap ||  Length of overlap (in data points) in diss_length || ATOMIX
|-
| goodman  || Flag for the vibration coherent noise removal using the Goodman algorithm. 0=not applied; 1=applied || ATOMIX
|-
| HP_cut  || The high-pass filter cutoff frequency in Hz. Can be zero for no filtering. || ATOMIX
|-
| conventions || A comma-separated list of the conventions that are followed by the dataset. e.g., CF-1.6, ACDD-1.3, ATOMIX || CF, ACDD
|-
| history || Provides an audit trail for modifications to the original data; e.g., Version 1 || CF, ACDD
|}
It is highly recommended to duplicate relevant attributes at the corresponding
group level. Attributes not listed in the Climate and Forecast (CF) and the Attribute Convention for Data Discovery (ACDD)
standards are labeled as ATOMIX.
</div>
 
=Optional Metadata=
<div class="mw-collapsible mw-expand" data-collapsetext="Collapse" data-expandtext="Expand">
<br>
{| class="wikitable sortable"
|-
! Attribute Name !! Description !! Convention
|-
| fft_length_sec ||  Length of the Fast Fourier transform segments in seconds || ATOMIX
|-
| diss_length_sec  || Dissipation estimate data length in seconds || ATOMIX
|-
| overlap_sec ||  Length of overlap (in seconds) in diss_length_sec || ATOMIX
|-
| f_AA ||  The anti-aliasing frequency in Hz || ATOMIX
|-
| FOM_limit ||  Figure of merit limit for quality assurance. Typically between 1.15 and 1.4. || ATOMIX
|-
| diss_ratio_limit ||  The limit to identify anomalously large disagreement between dissipation estimates from probes. The magnitude of the difference of the natural logarithm of two dissipation estimates should be smaller than diss_ratio_limit <math>\times \sigma_{\ln \varepsilon}</math>. Typically, 2.77. || ATOMIX
|-
| despike_shear_fraction_limit || The maximum allowed fraction of data (of each diss_length_sec length) removed by de-spiking. Typically, 0.05. || ATOMIX
|-
| despike_shear_iterations_limit || The maximum number of allowed iterations of de-spiking when producing the L2 shear probe data (one value per section). Typically 8. || ATOMIX
|-
| variance_resolved_limit || The minimum fraction of variance resolved in an estimate by spectral integration. Typically 0.6. || ATOMIX
|-
| f_limit || The upper limit to exclude frequencies from analysis. Typically infinity. || ATOMIX
|-
| fit_2_isr || Dissipation threshold for using the method of fitting in the inertial subrange. Typically <math>10^{−5}</math> W kg<math>^{−1}</math>. || ATOMIX
|-
| spectral_model || The model shear spectrum used in dissipation estimates with the integration method: e.g., Nasmyth, Lueck or Panchev-Kesich || ATOMIX
|-
|area || The region where the data were collected, e.g., Arctic Ocean, Barents Sea || ATOMIX
|-
|geospatial_vertical_min|| Further refinement of the geospatial bounding box. Vertical minimum in m || ACDD
|-
|geospatial_vertical_max|| Further refinement of the geospatial bounding box. Vertical maximum in m || ACDD
|-
|geospatial_vertical_positive|| Direction of positive vertical: down, up || ACDD
|-
|institution ||  The name of the institution principally responsible for originating this data || CF, ACDD
|-
|principal_investigator ||  Name of the principal investigator who created the data || ATOMIX
|-
|contact || Name of the contact person || ACDD
|-
|project || The scientific project that produced the data || ACDD
|-
|cruise || The name or number of the research cruise || ATOMIX
|-
|vessel || The name of the research vessel || ATOMIX
|-
|references || A list of related references || CF, ACDD
|-
|keywords || A comma-separated list of keywords and phrases || ACDD
|-
|creator_name || The data creator’s name || ACDD
|-
|creator_email || The data creator’s email || ACDD
|-
|creator_url || The data creator’s URL || ACDD
|-
|acknowledgement|| Acknowledgement of support for the project that produced this data || ACDD
|-
|station_name || The name of the station where data were collected || ATOMIX
|-
|license ||  Provide the URL to a standard or specific license, e.g, http://creativecommons.org/licenses/by/4.0/, Freely Distributed, or None || ACDD
|}
 
</div>
 
return to [[Dataset requirements for shear probes]] 
 
[[Category:Shear probes]]

Latest revision as of 19:51, 24 May 2024


Below we list the metadata required in a NetCDF data file, as well as the optional meta data we highly recommend that are included with the data set.

The parameter names should be used as listed (attention to underscores). The descriptions are example text or several options that are available for that parameter.


Required Metadata


Attibute Name Description Convention
title A comprehensive title for the dataset including the time and location aspect CF, ACDD
authors A list of authors ATOMIX
summary An abstract describing the dataset ACCD
comment Supplementary technical details about the collecting and processing of the dataset CF, ACDD
platform_type The platform from which the data are collected, e.g., sub-surface mooring, research vessel, sub-surface glider ACDD
source The instrument used for collecting the data. For example, vertical microstructure profiler, VMP2000 SN009 CF, ACDD
date_created The date on which the data were created, yyyy-mm-ddTHH:MM:SSZ ACDD
date_modified The date on which the data were last modified, yyyy-mm-ddTHH:MM:SSZ ACDD
time_reference_year Year for time reference ATOMIX
time_coverage_start Time of the first data point in the dataset, yyyy-mm-ddTHH:MM:SSZ ACDD
time_coverage_end Time of thelast data point in the dataset, yyyy-mm-ddTHH:MM:SSZ ACDD
geospatial_lat_min Southern bound of data, decimal degrees, negative for South ACDD
geospatial_lat_max Northern bound of data, decimal degrees, negative for South ACDD
geospatial_lon_min Western bound of data, decimal degrees, negative for West ACDD
geospatial_lon_max Eastern bound of data, decimal degrees, negative for West ACDD
fs_fast Sampling frequency for fast (turbulence) channels ATOMIX
fs_slow [math]\displaystyle{ ^a }[/math] Sampling frequency for slow channels (if exists). Alternative names could be, e.g., fs_CTD ATOMIX
profiling_direction Direction along which the section was collected, e.g., horizontal, vertical, or glide ATOMIX
fft_length Length of the Fast Fourier transform segments (in data points; note, fft_lengths_sec in seconds is optional) ATOMIX
diss_length Length of data (in data points) used for each dissipation estimate ATOMIX
overlap Length of overlap (in data points) in diss_length ATOMIX
goodman Flag for the vibration coherent noise removal using the Goodman algorithm. 0=not applied; 1=applied ATOMIX
HP_cut The high-pass filter cutoff frequency in Hz. Can be zero for no filtering. ATOMIX
conventions A comma-separated list of the conventions that are followed by the dataset. e.g., CF-1.6, ACDD-1.3, ATOMIX CF, ACDD
history Provides an audit trail for modifications to the original data; e.g., Version 1 CF, ACDD

It is highly recommended to duplicate relevant attributes at the corresponding group level. Attributes not listed in the Climate and Forecast (CF) and the Attribute Convention for Data Discovery (ACDD) standards are labeled as ATOMIX.

Optional Metadata


Attribute Name Description Convention
fft_length_sec Length of the Fast Fourier transform segments in seconds ATOMIX
diss_length_sec Dissipation estimate data length in seconds ATOMIX
overlap_sec Length of overlap (in seconds) in diss_length_sec ATOMIX
f_AA The anti-aliasing frequency in Hz ATOMIX
FOM_limit Figure of merit limit for quality assurance. Typically between 1.15 and 1.4. ATOMIX
diss_ratio_limit The limit to identify anomalously large disagreement between dissipation estimates from probes. The magnitude of the difference of the natural logarithm of two dissipation estimates should be smaller than diss_ratio_limit [math]\displaystyle{ \times \sigma_{\ln \varepsilon} }[/math]. Typically, 2.77. ATOMIX
despike_shear_fraction_limit The maximum allowed fraction of data (of each diss_length_sec length) removed by de-spiking. Typically, 0.05. ATOMIX
despike_shear_iterations_limit The maximum number of allowed iterations of de-spiking when producing the L2 shear probe data (one value per section). Typically 8. ATOMIX
variance_resolved_limit The minimum fraction of variance resolved in an estimate by spectral integration. Typically 0.6. ATOMIX
f_limit The upper limit to exclude frequencies from analysis. Typically infinity. ATOMIX
fit_2_isr Dissipation threshold for using the method of fitting in the inertial subrange. Typically [math]\displaystyle{ 10^{−5} }[/math] W kg[math]\displaystyle{ ^{−1} }[/math]. ATOMIX
spectral_model The model shear spectrum used in dissipation estimates with the integration method: e.g., Nasmyth, Lueck or Panchev-Kesich ATOMIX
area The region where the data were collected, e.g., Arctic Ocean, Barents Sea ATOMIX
geospatial_vertical_min Further refinement of the geospatial bounding box. Vertical minimum in m ACDD
geospatial_vertical_max Further refinement of the geospatial bounding box. Vertical maximum in m ACDD
geospatial_vertical_positive Direction of positive vertical: down, up ACDD
institution The name of the institution principally responsible for originating this data CF, ACDD
principal_investigator Name of the principal investigator who created the data ATOMIX
contact Name of the contact person ACDD
project The scientific project that produced the data ACDD
cruise The name or number of the research cruise ATOMIX
vessel The name of the research vessel ATOMIX
references A list of related references CF, ACDD
keywords A comma-separated list of keywords and phrases ACDD
creator_name The data creator’s name ACDD
creator_email The data creator’s email ACDD
creator_url The data creator’s URL ACDD
acknowledgement Acknowledgement of support for the project that produced this data ACDD
station_name The name of the station where data were collected ATOMIX
license Provide the URL to a standard or specific license, e.g, http://creativecommons.org/licenses/by/4.0/, Freely Distributed, or None ACDD

return to Dataset requirements for shear probes

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