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.


    • Proj-4.4.7 available at
      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)
    Rueben Schulz
    See Also:
    Orthographic projection on, "Orthographic" on, Serialized Form