PyReshaper 0.9.3

Python Time-Slice to Time-Series NetCDF Converter

A package for converting NetCDF files from time-slice (history) format to time-series (single-variable) format.

AUTHORS:

John Dennis, Sheri Mickelson, Kevin Paul, Haiying Xu

VERSION:

0.9.3

COPYRIGHT:

See the document entitled LICENSE.txt

Send questions and comments to Kevin Paul ([e-mail]).

Overview

The PyReshaper package is a Python-based package for performing time-slice to time-series convertion of NetCDF files, compliant with the CF 1.6 Conventions. The PyReshaper package is designed to run in parallel to maximize performance, with the parallelism implemented over variables (i.e., task parallelism). This means that the maximum parallelism achieveable for a given operation is one core/processor per variables in the time-slice NetCDF files.

Dependencies

The PyReshaper directly depends upon the PyNIO and mpi4py packages. Access and manipulation of the NetCDF files is done through PyNIO, and the parallelism is implimented directly with mpi4py. Implicit dependencies exists, as PyNIO has its own dependencies (netCDF, NCL, and numpy) as does mpi4py (numpy and MPI).

Currently the explicit dependencies are known to be:

• ASAPTools (>=0.3)

• PyNIO (>=1.4.1)

• mpi4py (>=1.3)

This implies the dependencies:

• PyNIO depends upon numpy (>=1.4), NCL, and netCDF

• mpi4py depends on numpy (>=1.4) and MPI

Additionally, the entire package is designed to work with Python v2.6 and up to (but not including) Python v3.0.

The version requirements have not been rigidly tested, so earlier versions may actually work. No version requirement is made during installation, though, so problems might occur if an earlier versions of these packages have been installed.

Obtaining the Source Code

Currently, the most up-to-date development source code is available via svn from the site:

https://github.com/NCAR-CISL-ASAP/PyReshaper

The most stable tag is the ‘v0.9.3’ tag, which is recommended for general use. The source is available in read-only mode to everyone, but special permissions can be given to those to make changes to the source.

Building & Installation

Installation of the PyReshaper is very simple. After checking out the source from the above svn link, via:

$ git clone https://github.com/NCAR-CISL-ASAP/PyReshaper

Enter the newly cloned directory and check out the most recent stable tag:

$ cd PyReshaper
$ git checkout v0.9.3

Then, run the Python distutils setup. On unix, this involves:

$  python setup.py install [--prefix=/path/to/install/location]

The prefix is optional, as the default prefix is typically /usr/local on linux machines. However, you must have permissions to write to the prefix location, so you may want to choose a prefix location where you have write permissions. Like most distutils installations, you can alternatively install the pyReshaper with the –user option, which will automatically select (and create if it does not exist) the $HOME/.local directory in which to install. To do this, type (on unix machines):

$  python setup.py install --user

This can be handy since the site-packages directory will be common for all user installs, and therefore only needs to be added to the PYTHONPATH once.

To install the documentation, you must have Sphinx installed on your system. Sphinx can be easily installed with pip, via:

$  pip install Sphinx

Once Sphinx is installed, you can build the PyReshaper HTML documentation with:

$  cd docs
$  make html

The resulting HTML documentation will be placed in the docs/build/html directory, and the main page can be loaded with any browser pointing to ‘docs/build/html/index.html’.

Before Using the PyReshaper Package

Before the PyReshaper package can be used, you must make sure that the site-packages directory containing the ‘pyreshaper’ source directory is in your PYTHONPATH. Depending on the PREFIX used during installation, this path will be:

$PREFIX/lib/python2.X/site-packages

where X will be 6 or 7 (or other) depending on the version of Python that you are using to install the package.

To use the PyReshaper scripts (e.g., ‘slice2series’), you must add the script binary directory to your PATH. Depending on the PREFIX used during installation, this path will be:

$PREFIX/bin/

Once the script binary directory has been added to your PATH and the site-packages directory has been added to your PYTHONPATH, you may use the PyReshaper package without issue.

Instructions & Use

Please see the more detailed instructions found in the docs/ directory for usage and examples. See the ‘Building & Installation’ section for how to build the documentation with Sphinx.