NetCDF global attributes

List of attributes

DMQS metadata

In the R&D project Datenmanagement und Qualitätssicherung im Verkehrswasserbau (DMQS) new guidelines for the creation of metadata were formulated, especially in connexion with use of simulation programs (see Mathematical Models for Coastal Areas and Estuaries).

All resulting recommendations are described in recording of metadata for a simulation (available in German only). Recommendations for the creation of metadata can be regarded as a replacement for file input from nc_meta.dat (see subsequent section). They shall be used with priority.

Metadata from nc_meta.dat or other input steering data files

Creation of metadata shall be carried through with priority according to the recommendations given in the above section related to DMQS metadata. If this is not applicable, input from nc_meta.dat can be regarded as an alternative.

• Institution

  institution = "Bundesanstalt fuer Wasserbau - Federal Waterways Engineering and Research Institute" ;

• Publisher

  naming_authority = "de.baw" ;

  publisher_name = "BAW - Abteilung Wasserbau - Hydraulic Engineering - Hamburg" ;

  publisher_email = "info@baw.de" ;

  publisher_url = "http://www.baw.de/de/wasserbau/index.html" ;

• Project

  project = "Creation of CF NetCDF files using UnTRIM2007" ;

• Method

  source = "untrim2007_work_gl.xe test version" ;

  references = "http://wiki.baw.de/en/index.php5/UNTRIM2007" ;

• Data set

  title = "results for site specific model KURVE" ;

  id = "untrim2007-run-entwicklung-kurve-xe-untrim2007-00001" ;

  summary = "2D and 3D results were generated for test purposes.\\nContains water level, current velocity, salinity, suspended sediment concentration, tracer concentration plus additional auxiliary variables.\\nSeveral global metadata have been created for the first time." ;

• Creator

  creator_name = "Guenther Lang" ;

  creator_url = "http://www.baw.de/EN/wasserbau/wasserbau.html" ;

  creator_email = "guenther.lang@baw.de" ;

• Contributors

  contributor_name = "Guenther Lang, Susanne Spohr" ;

  contributor_role = "project leader, co-worker" ;

• Acknowledgment

  acknowledgment = "grid generated by Christoph Lippert (smile consult, Hannover, http://www.smileconsult.de/)" ;

Automatically added metadata

• Conventions

  Conventions = "CF-1.6" ; // if CF compliant

  Conventions = "UGRID-1.0" ; // if UGRID compliant but not CF compliant

  Conventions = "CF-1.6, UGRID-1.0" ; // if CF compliant and UGRID compliant

  standard_name_vocabulary = "CF-1.6" ;

• History

  history = "/net/themis2/system/akprog/examples/untrim2007/data/kurve/\\n06/27/2012-09:54:36.462000000 UTC, h_grid, Grid_File\\n06/27/2012-09:54:44.984000000 UTC, m_untrim2007_utromp2007, utromp2007.xe.dat" ;

  Each application using the data should add an entry to this attribute which could contain the following information:

  1. date and time of program execution,

  2. name of executable, and

  3. name of major input steering data file, if present.

  date_created = "2012-06-27T09:54:44.045000000+00:00" ; // see ISO 8601

  date_modified = "2012-06-27T09:54:44.045000000+00:00" ; // see ISO 8601

• Data set

  uuid = "08f169c6-7b7b-1030-8001-0030487ca4a8" ; // see Universally Unique Identifier

• Spatial reference

  geospatial_lat_min = 53.00748773384447357 ;

  geospatial_lat_max = 53.0168838793441595 ;

  geospatial_lat_units = "degrees_north" ;

  geospatial_lat_resolution = "on average 14.13 meters" ;

  geospatial_lon_min = 7.8641123924508 ;

  geospatial_lon_max = 7.897937700526 ;

  geospatial_lon_units = "degrees_east" ;

  geospatial_lon_resolution = "on average 14.13 meters" ;

• Time reference

  time_coverage_start = "2001-07-24T00:00:00+01:00" ; // see ISO 8601

  time_coverage_end = "2001-07-24T04:00:00+01:00" ; // see ISO 8601

  time_coverage_resolution = "P000000DT00H30M00S" ;// see ISO 8601

Remarks

• Global attributes describe the data source as well as the institution which originally created the data. An overview of the use history is also given. Also informations about metadata conventions used are contained.
• From the attributes listed above not all of them are always present.
• For further information on this subject see CF Metadata Convention and NODC NetCDF Templates.

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