Classic AIPS
World Coordinate Systems
The eight most commonly-used projections of classic AIPS may be computed using the
worldpos
and
worldpix
subroutines
written by Bill Cotton and Eric Greisen of NRAO. They are
SIN: Orthographic projection
TAN: Tangent plane projection
ARC: Zenithal equidistant projection
NCP: North celestial pole projection
GLS: Sanson-Flemsteed sinusoidal projection
MER: Mercator projection
AIT
: Hammer-Aitoff equal area all-sky projection
STG: Stereographic projection (zenithal orthomorphic)
Eric Greisen described the first four in
this 1983 memo
and the second four in
this 1993 memo
.
Last updated 22 April 2015 by
Jessica Mink
,
Harvard-Smithsonian Center for Astrophysics Telescope Data Center
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