rotate.axis: Rotate axis of sphere

In retistruct: Retinal Reconstruction Program

Rotate axis of sphere

Description

This rotates points on sphere by specifying the direction its polar axis, i.e. the axis going through (90, 0), should point after (a) a rotation about an axis through the points (0, 0) and (0, 180) and (b) rotation about the original polar axis.

Usage

rotate.axis(r, r0)

Arguments

r	Coordinates of points in spherical coordinates represented as 2 column matrix with column names phi (latitude) and lambda (longitude).
r0	Direction of the polar axis of the sphere on which to project represented as a 2 column matrix of with column names phi (latitude) and lambda (longitude).

Value

2-column matrix of spherical coordinates of points with column names phi (latitude) and lambda (longitude).

Author(s)

David Sterratt

Examples

r0 <- cbind(phi=0, lambda=-pi/2)
r <- rbind(r0, r0+c(1,0), r0-c(1,0), r0+c(0,1), r0-c(0,1))
r <- cbind(phi=pi/2, lambda=0)
rotate.axis(r, r0)

retistruct documentation built on April 3, 2025, 5:58 p.m.