aitoff: Convert longitude, latitude to X,Y using an AITOFF projection
Description
Convert longitude, latitude to X,Y using an AITOFF projection
Usage
aitoff(l,b)
Arguments
l
longitude, scalar or vector, in degrees
b
latitude, scalar or vector (same length as l), in degrees
Value
x
x coordinate in range -180 to +180, same length as l.
yx
y coordinate in range -90 to +90, same length as l.
Details
This procedure can be used to create an all-sky map in Galactic
coordinates with an equal-area Aitoff projection. Output map
coordinates are zero longitude centered. See AIPS memo No. 46, page 4,
for details of the algorithm. This
version of AITOFF assumes the projection is centered at b=0 degrees.
Several polar equal-area map projections are provided by the CRAN package mapproj.