net.grelf.grip

Class Astrometry

java.lang.Object

net.grelf.grip.Astrometry

public class Astrometry
extends java.lang.Object

Astrometric measurement of images. Method given in W.M.Smart, Spherical Astronomy, Cambridge University Press (6th edition, 1977).

Constructor Summary

Constructors

Constructor and Description
Astrometry()

Method Summary

Modifier and Type	Method and Description
static SkyPoint	measure(Image im, java.util.List<Star> refStars, java.util.List<PointFloat> refPoints, SkyPoint approxPlateCentre, PointFloat targetPoint) The image is assumed NOT to have been through an inverse gnomonic projection.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Astrometry

public Astrometry()

Method Detail

measure

public static SkyPoint measure(Image im,
                               java.util.List<Star> refStars,
                               java.util.List<PointFloat> refPoints,
                               SkyPoint approxPlateCentre,
                               PointFloat targetPoint)

The image is assumed NOT to have been through an inverse gnomonic projection. The reference stars are all assumed to have positions for the same equinox and that is the same equinox as for the plate centre, usually J2000.0. The reference points (in the image) are in the same order as the reference stars. As usual in images, the reference points are measured from the origin (top, left) of the image; this fact is allowed for in the algorithm. Returns null in the event of errors being detected.