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Difference between revisions of "NetCDF"

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imported>Lang Guenther
(Purpose of these BAWiki Pages: link to cf metadata convention changed)
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The BAW instance of a NetCDF file developed since 2010 is a file of type [[CF-NETCDF.NC]].
 
The BAW instance of a NetCDF file developed since 2010 is a file of type [[CF-NETCDF.NC]].
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Since version NetCDF-4.0 HDF (''Hierarchical Data File'', see [http://www.hdfgroup.org/HDF5/ HDF5 Group]) is used as the underlying file format. Due to the use of HDF concepts like online compression of data stored in NetCDF files is supported as well as chunking of variables to balance read performance in case of different access to data, e.g. time-series vs. synoptic data set access.
  
 
=Terminology=
 
=Terminology=

Revision as of 08:25, 28 July 2014

General Aspects

Purpose of these BAWiki Pages

These BAWiki pages do describe all NetCDF conventions required to store baw-specific data in NetCDF data files (see network common data form). I. e. all local conventions are listed, which go beyond the international agreed-upon CF-metadata convention. These pages are also meant as a discussion ground for agreeing on those additional conventions required.

In cases where the international agreed-upon conventions are insufficient, one should first check whether extensions described in Deltares-Conventions can be used or not - it is recommended to discuss further required extensions with Deltares. The version which has been recommended to become a standard can be found on the GITHUB. Further activities related with OpenDAP to extract a selection of data defined on unstructured grids can be found on e. g. OPULS.

The additional conventions should be listed in the global NetCDF attribute Conventions, e. g. in the following way:

// global attributes:
 :Conventions = "CF-1.4/Deltares-0.1/BAW-0.1" .

The BAW instance of a NetCDF file developed since 2010 is a file of type CF-NETCDF.NC.

Since version NetCDF-4.0 HDF (Hierarchical Data File, see HDF5 Group) is used as the underlying file format. Due to the use of HDF concepts like online compression of data stored in NetCDF files is supported as well as chunking of variables to balance read performance in case of different access to data, e.g. time-series vs. synoptic data set access.

Terminology

Global Attributes

Grids

Time Coordinate

Vertical Coordinate

Horizontal Coordinate Reference System

Reduction of Dataset Size

Data

Synoptic Data

Time Series Data

Analysis Data


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