Obit - Astronomy Software for Algorithm Development
Merx mollis mortibus nuper

Overview

Obit is a group of software packages for handling radio astronomy data, especially interferometric and single dish OTF imaging. This software is made available under the GNU General Public License in the hope that it might be useful but "as is" with NO GUARANTEE OR ASSURANCE of suitability, usability or correctness for any purpose. Obit is developed and maintained by Bill Cotton at The National Radio Astronomy Observatory in Charlottesville, Virginia, USA. Obit is intended primarily as an environment in which new data processing algorithms can be developed and tested but which can also be used for production processing of a certain range of scientific problems.

Obit is a Unix software environment with a limited set of developed applications. It is an object--oriented set of class and utility libraries allowing access to multiple disk--resident data formats. In particular, access to either AIPS disk data or FITS files. A number of low level applications are implemented such as imaging and deconvolving interferometer or OTF data, High-level applications may be either compiled c programs or python scripts; most of the high-level operations have bindings to python. Obit applications are interoperable with Classic AIPS and the ObitTalk python interface gives access to AIPS tasks as well as Obit libraries and tasks.

A preprint of a paper describing the Obit package (PASP, 2008, 120, 439) is available.

Binary Distribution of Obit

Periodic binary distributions of Obit are available here.

Obit Stable Releases

There is a system of stable releases of Obit for which bugs will be fixed but no further development activities will be done. These are available via Subversion.

This will create a directory with the release name (e.g. Obit-01JAN10) in the current working directory which is the root of the Obit installation. Once a copy is obtained fron Subversion, it can be installed using the InstallObit.sh shell script. See the README file for details. The third party software to be installed will be downloaded as part of the installation so internet access is required. Updates for bug fixes can be obtained by cding to the root directory and:
% svn update

Using Subversion to obtain Development Obit

The anonymous server allows you to get the most up-to-date version of software and then do updates to the software.

To checkout the Obit installation package from Subversion, including most third party software:
% svn checkout https://svn.cv.nrao.edu/svn/ObitInstall/

This will checkout the installation package described below. This software can be installed as described in the README file.
Updates are then possible using:
% svn update

The Subversion server has a Web based browser that displays the current state of the repository.

Documentation

Software Documentation

Obit Algorithmic Development Memos

Obit Development Memo Series

Presentations related to Obit

Obit Components

There are several components of Obit and related software. This and required third party software can be obtained as described above.
The (USA) National Radio Astronomy Observatory (NRAO) is operated by Associated Universities, Inc. and is a Facility of the (USA) National Science Foundation.

Comments? Questions? Problems?