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The Measures System in AIPS++

AIPS++ has modules called Measures and quanta (in the package general), to handle various astronomical measures and quantities. A quantity is value with a Unit (e.g. 5km/s, 7arcsec) and measures is a quantity with a reference frame (e.g. J2000, UTC). Many tools in AIPS++ use the tools of the Measures and quanta modules in their computations. These modules can also be used directly for various astronomical computations and conversions. A module called measures_data contains (and updated periodically) a variety of astronomical data (e.g. solar system parameters, time related parameters, some source co-ordinates) which are utilized by the various tools in the modules Measures and quanta. All the computations can be handled using GUIs as well as Glish commands.

For an introduction to the Measures system, see The Measures system by Wim Brouw and The Measures system: II by Wim Brouw in April and June 98 AIPS++News Letters.

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2006-10-15