Invert image of a partial sphere and scale the longitude so that
points at latitude phi0 is projected onto a longitude of 0
degrees (the equator).
invert.sphere.to.hemisphere(r, phi0, ...)Coordinates of points in spherical coordinates
represented as 2 column matrix with column names phi
(latitude) and lambda (longitude).
The latitude to map onto the equator
Other arguments
Matrix in same format, but with pi added to lambda
and phi negated and scaled so that the longitude
phi0 is projected to 0 degrees (the equator)