Class Orthographic

All Implemented Interfaces:
Serializable, MathTransform, MathTransform2D
Direct Known Subclasses:
ObliqueOrthographic, PolarOrthographic

public abstract class Orthographic extends MapProjection
Orthographic Projection. This is a perspective azimuthal (planar) projection that is neither conformal nor equal-area. It resembles a globe and only one hemisphere can be seen at a time, since it is a perspectiove projection from infinite distance. While not useful for accurate measurements, this projection is useful for pictorial views of the world. Only the spherical form is given here.

NOTE: formulae used below are from a port, to java, of the proj package of the USGS survey. USGS work is acknowledged here.

References:

  • Proj-4.4.7 available at www.remotesensing.org/proj
    Relevant files are: PJ_ortho.c, pj_fwd.c and pj_inv.c.
  • John P. Snyder (Map Projections - A Working Manual, U.S. Geological Survey Professional Paper 1395, 1987)
Since:
2.1
Author:
Rueben Schulz
See Also: