Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0307t&link_type=abstract
American Astronomical Society, SPD meeting #37, #3.07; Bulletin of the American Astronomical Society, Vol. 38, p.223
Astronomy and Astrophysics
Astronomy
Scientific paper
The World Coordinate System (WCS) is a recent addition to the FITS standard toallow more flexibility and accuracy to the way that coordinates are handled inFITS headers. Use of the WCS provides a standard way to describe coordinatesfor all kinds of solar data--not just two-dimensional images, but also synopticmaps, R-Theta plots, spectra, time series, and more. New software in theSolarSoft library supports the WCS formalism, and allows complex coordinates tobe handled with a few simple calls. This new solar coordinate system andsoftware offers several advantages to upcoming missions:1. Provides a standard method for encoding observer's position in FITSheaders.2. Treats image coordinates in the full spherical sense.3. Allows multiple coordinate systems to be applied to the same data set,e.g. both cartesian and heliographic.4. Handles non-linear spectral dispersion functions.5. Handles cross terms between disparate coordinate axes, such as betweenspatial and spectral axes.In general, use of a standardized coordinate system will pave the way for moreclosely integrated software between missions.This work was supported by NASA Contract NAS5-32350.
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