freebsd-ports/astro/wcslib/pkg-descr

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"WCSLIB is a C library, supplied with a full set of Fortran wrappers, that
implements the "World Coordinate System" (WCS) convention in FITS (Flexible
Image Transport System). It also includes a PGPLOT-based routine, PGSBOX,
for drawing general curvilinear coordinate graticules and a number of
utility programs." - from README file.
WWW: http://www.atnf.csiro.au/people/mcalabre/WCS/index.html