eqpole:
Convert Right Ascension and declination to X,Y using an equal-area polar projection
Description
Convert Right Ascension and declination to X,Y using an equal-area polar projection
Usage
eqpole(l, b, southpole)
Arguments
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)
Value
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
Details
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.