Difference between revisions of "CF Naming Conventions"

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{{WCS Glossary
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== AQ CF standard names==
|Glossary Domain=HTAP
 
|TermDesc=Metadata conventions supporting interoperability for earth science data from different sources containing model output and observational datasets. It was developed for encoding Climate and weather Forecast metadata in netCDF files. In this context it is used for standard naming of air quality/atmospheric composition parameters.
 
}}
 
=== CF Convention Dimensions and Coordinate Information ===
 
Metadata required to locate data in space and time. Special on vertical coordinates (Kari, Decker, Martin). Coordinate (0-360 or -180 to +180) - Martin
 
  
=== CF Convention for Names for Air Quality and Atmospheric Composition ===
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This is the work space associated with the [http://wiki.esipfed.org/index.php/Standards_and_Conventions_for_WCS_Server#CF_Conventions CF conventions description]. While the actual approval process for new standard names happens exclusively via the CF mailing list, you can use these pages to prepare such discussions, monitor progress or ventilate new ideas. For additional information what this is about, please consult the [http://wiki.esipfed.org/index.php/Standards_and_Conventions_for_WCS_Server#CF_Conventions main page on ESIP], the [http://cf-pcmdi.llnl.gov/ CF home page] or directly the [http://cf-pcmdi.llnl.gov/documents/cf-conventions/latest-cf-conventions-document-1 latest CF standard document] or [http://cf-pcmdi.llnl.gov/documents/cf-standard-names/ standard name table].
The CF standard name table specifies the possible values of the standard_name attribute defined by the CF NetCDF standard. Names in the table are constructed following CF Naming guidelines. A central element of the CF Conventions is the CF Standard Name Tablem which uniquely associates a standard name with each geophysical parameter
 
  
As an example CF standard names, the entry for sea-level atmospheric pressure includes:
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=== Discussion of standard name attributes for AirNow and RSIG variables ===
* standard name: air_pressure_at_sea_level
 
* description: sea_level means mean sea level, which is close to the geoid in sea areas. Air pressure at sea level is the * quantity often abbreviated as MSLP or PMSL.
 
* canonical units: Pa
 
  
=== CF Convention for Provenance ===  
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* AirNow variable list with available and suggested standard_name attributes as well as suggested points for discussion [[Media:AirNow_Main_Params_mgs.doc]]
List from the CF
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* Commented RSIG variable list (only partially commented due to sheer size) [[Media:rsig_variables.xls]]
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Brief summary: many quantities contained in either variable set have already been defined in the [http://cf-pcmdi.llnl.gov/documents/cf-standard-names/ CF standard name table] or they have close counterparts which require only simple additions to this table (for example adding another species name to the available list of "mole_fraction_of_X_in_air"). Some more discussion is needed on the following points:
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* aerosol properties and size classes (currently, only pm2p5, nucleation_mode and coarse_mode are known in the CF standard name table)
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* handling of source attributions (for example "SOA from benzene" or "anthropgenic aerosol")
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* more specific descriptions of technical pecularities concerning (particle) measurements
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* description of many variables concerning (CALIPSO) satellite retrievals
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=== Pending suggestions for new AQ related CF standard names ===
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* [[Media:Pending_CF_standard_names-20111005.doc]]
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=== Discussion on CF metadata for time aggregates and AQ metrics ===
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Recently, a discussion has started on the CF mailing list, how more complex data aggregates, such as the "daily maximum 8-hour ozone concentration" can be incorporated into the CF standard metadata. The present proposal is to extend the syntax of the "cell_methods" attribute to allow multiple operations. Example '''o3.cell_methods = "time: mean (period: 8 hours) time: maximum (interval: 1 hour)".'''.
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This discussion is not closed yet, because people from other communities would like to see an alternative approach where the "original" time information could be preserved. In this proposal, one would (have to?) create an additional time axis which would carry the mean time and time bounds for the daily 8-hour intervals.

Latest revision as of 02:23, July 22, 2012

AQ CF standard names

This is the work space associated with the CF conventions description. While the actual approval process for new standard names happens exclusively via the CF mailing list, you can use these pages to prepare such discussions, monitor progress or ventilate new ideas. For additional information what this is about, please consult the main page on ESIP, the CF home page or directly the latest CF standard document or standard name table.

Discussion of standard name attributes for AirNow and RSIG variables

Brief summary: many quantities contained in either variable set have already been defined in the CF standard name table or they have close counterparts which require only simple additions to this table (for example adding another species name to the available list of "mole_fraction_of_X_in_air"). Some more discussion is needed on the following points:

  • aerosol properties and size classes (currently, only pm2p5, nucleation_mode and coarse_mode are known in the CF standard name table)
  • handling of source attributions (for example "SOA from benzene" or "anthropgenic aerosol")
  • more specific descriptions of technical pecularities concerning (particle) measurements
  • description of many variables concerning (CALIPSO) satellite retrievals

Pending suggestions for new AQ related CF standard names

Discussion on CF metadata for time aggregates and AQ metrics

Recently, a discussion has started on the CF mailing list, how more complex data aggregates, such as the "daily maximum 8-hour ozone concentration" can be incorporated into the CF standard metadata. The present proposal is to extend the syntax of the "cell_methods" attribute to allow multiple operations. Example o3.cell_methods = "time: mean (period: 8 hours) time: maximum (interval: 1 hour)"..

This discussion is not closed yet, because people from other communities would like to see an alternative approach where the "original" time information could be preserved. In this proposal, one would (have to?) create an additional time axis which would carry the mean time and time bounds for the daily 8-hour intervals.