Netcdf Implementation

This module implements netcdf format access with DRB data model. It is able to navigates among the netcdf contents.

Netcdf Factory and Netcdf Node

The module implements the basic factory model defined in DRB in its node resolver. Based on the python entry point mechanism, this module can be dynamically imported into applications.

The entry point group reference is drb.impl.
The implementation name is netcdf.
The factory class is decribed with implementation drb_impl_netcdf.drb_impl_signature.

The netCDF 4.0 data model is based on recusive structure of Groups each containing a set of Attributes, Dimensions and Variables. It also includes User-defined set of types. The Drb structure implemented here, reproduces this representation. Attributes are reported in node as node attributes whereas Dimensions and Values are reported as node children. The raw content is available in Variable node requesting array (xarray, or numpy ndarray types)

limitations

The current version does not manage child modification and insertion. DrbNetcdfNode is currently read only. The factory to build DrbNetcdfNode supports file directly opening it with path, for other implementation ByteIO or BufferedIOBase, they are manged with a local temporary file, removed when the node is closed..

limitations HDF-EOS file

When open a HDF-EOS file in HDF4 format If fails with message:[Errno -128] NetCDF: Attempt to use feature that was not turned on when netCDF was built This means that NetCDF system library linked with netCDF4 python wasn't compiled with HDF4 support. You can try to install netCDF4 python by conda

conda install -c conda-forge netcdf4

Or rebuild netCDF4 locally with netCDF library with support hdf4 turned ON

Using this module

To include this module into your project, the drb-impl-netcdf module shall be referenced into requirements.txt file, or the following pip line can be run:

pip install drb-impl-netcdf