retistruct (version 0.5.9)

orthographic: Orthographic projection

Description

Orthographic projection

Usage

orthographic(r, proj.centre = cbind(phi = 0, lambda = 0), ...)

Arguments

r

Lattitude-longitude coordinates in a matrix with columns labelled phi (lattitude) and lambda (longitude)

proj.centre

Location of centre of projection as matrix with column names phi (elevation) and lambda (longitude).

...

Arguments not used by this projectio.n

Value

• Two-column matrix with columns labelled x and y of locations of projection of coordinates on plane

References

http://en.wikipedia.org/wiki/Map_projection, http://mathworld.wolfram.com/OrthographicProjection.html