eqpole {astrolibR} | R Documentation |
Convert Right Ascension and declination to X,Y using an equal-area polar projection
eqpole(l, b, southpole)
l |
longitude, in degrees, scalar or vector |
b |
latitude, in degrees, same number of elements as longitude |
southpole |
Set to TRUE if plot is centered on the south pole instead of the north pole (optional, default = FALSE) |
The output X and Y coordinates are scaled to be between -90 and +90 to go from equator to pole to equator. Output map points can be centered on the north pole or south pole.
Several polar equal-area map projections are provided by the CRAN package mapproj.
X |
X coordinate, ranging from -90 to +90, same number of elements as longitude, in degrees |
Y |
Y coordinate, ranging from -90 to +90, same number of elements as longitude, in degrees |
Written by J. Bloch LANL, SST-9 1.1 5/16/91
R adaptation by Arnab Chakraborty (June 2013)
eqpole(100, -20.)