OYSTER is a 50,000+ lines of code project to provide a comprehensive system for displaying, editing, calibrating, and modeling interferometry data. It has been developed by Dr. Christian Hummel over several years at the US Naval Observatory (USNO) and the European Southern Observatory (ESO). IDL (a trademark of Exelis Visual Information Solutions) was chosen as the programming environment because it provides interactive data manipulation and extensive plotting and visualization tools. Coding and debugging are very fast in this environment.

The name OYSTER was derived from OISDR (Optical Interferometry Script Data Reduction). The Navy Precision Optical Interferometer developers believe in real world naming of software.

Modeling interferometric data (AMOEBA) is based on a hierarchical model prescription including analytical models for simple components, and includes external public packages for rotating stars and interacting binaries. Stellar data and their relations as well as stellar spectra are computed and made accessible via scripts (STARBASE). Experimental support for polychromatic imaging based on a multi-wavelength CLEAN algorithm (PEARL) is included.

OYSTER is also used to reduce and calibrate data of the Navy Precision Optical Interferometer (NPOI) operated by USNO, NRL (Naval Research Laboratory) and Lowell Observatory. It offers an automatic pipeline as well for these data (CHAMELEON).

OYSTER is an endeavor to integrate all tasks related to planning and analysing interferometric observations in one package. It also tries to maximize ease of use by providing both command line procedures and GUIs. A 100-page manual is provided. Users can also find instructions on how to build their own library of procedures which take the place of and modify the implemented procedures by compilation at runtime.

Available features of OYSTER include:

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