ellipsoid.java

openmap java写的开源数字地图程序. 用applet实现,可以像google map 那样放大缩小地图.

// **********************************************************************
// 
// <copyright>
// 
//  BBN Technologies
//  10 Moulton Street
//  Cambridge, MA 02138
//  [phone]
// 
//  Copyright (C) BBNT Solutions LLC. All rights reserved.
// 
// </copyright>
// **********************************************************************
// 
// $Source: /cvs/distapps/openmap/src/openmap/com/bbn/openmap/proj/Ellipsoid.java,v $
// $RCSfile: Ellipsoid.java,v $
// $Revision: 1.2.2.2 $
// $Date: 2004/10/14 18:27:35 $
// $Author: dietrick $
// 
// **********************************************************************

package com.bbn.openmap.proj;

/**
 * A class representing a reference Ellipsoid for UTM calculations.
 * <p>
 * 
 * Adapted to Java by Colin Mummery ([e-mail]) from
 * C++ code by Chuck Gantz ([e-mail]).
 */
public class Ellipsoid {

    //The ellipsoids defined for this implementation
    /** "Airy" */
    public final static Ellipsoid AIRY = new Ellipsoid("Airy", 6377563.0d, 0.00667054d);
    /** "Australian National" */
    public final static Ellipsoid AUSTRALIAN_NATIONAL = new Ellipsoid("Australian National", 6378160.0d, 0.006694542d);
    /** "Bessel 1841" */
    public final static Ellipsoid BESSEL_1841 = new Ellipsoid("Bessel 1841", 6377397.0d, 0.006674372d);
    /** "Bessel 1841 (Nambia) " */
    public final static Ellipsoid BESSEL_1841_NAMIBIA = new Ellipsoid("Bessel 1841 Namibia", 6377484.0d, 0.006674372d);
    /** "Clarke 1866" */
    public final static Ellipsoid CLARKE_1866 = new Ellipsoid("Clarke 1866", 6378206.0d, 0.006768658d);
    /** "Clarke 1880" */
    public final static Ellipsoid CLARKE_1880 = new Ellipsoid("Clarke 1880", 6378249.0d, 0.006803511d);
    /** "Everest" */
    public final static Ellipsoid EVEREST = new Ellipsoid("Everest", 6377276.0d, 0.006637847d);
    /** "Fischer 1960 (Mercury) " */
    public final static Ellipsoid FISHER_1960_MERCURY = new Ellipsoid("Fisher 1960 Mercury", 6378166.0d, 0.006693422d);
    /** "Fischer 1968" */
    public final static Ellipsoid FISHER_1968 = new Ellipsoid("Fisher 1968", 6378150.0d, 0.006693422d);
    /** "GRS 1967" */
    public final static Ellipsoid GRS_1967 = new Ellipsoid("GRS 1967", 6378160.0d, 0.006694605d);
    /** "GRS 1980" */
    public final static Ellipsoid GRS_1980 = new Ellipsoid("GRS 1980", 6378137.0d, 0.00669438d);
    /** "Helmert 1906" */
    public final static Ellipsoid HELMERT_1906 = new Ellipsoid("Helmert 1906", 6378200.0d, 0.006693422d);
    /** "Hough" */
    public final static Ellipsoid HOUGH = new Ellipsoid("Hough", 6378270.0d, 0.00672267d);
    /** "International" */
    public final static Ellipsoid INTERNATIONAL = new Ellipsoid("International", 6378388.0d, 0.00672267d);
    /** "Krassovsky" */
    public final static Ellipsoid KRASSOVSKY = new Ellipsoid("Krassovsky", 6378245.0d, 0.006693422d);
    /** "Modified Airy" */
    public final static Ellipsoid MODIFIED_AIRY = new Ellipsoid("Modified Airy", 6377340.0d, 0.00667054d);
    /** "Modified Everest" */
    public final static Ellipsoid MODIFIED_EVEREST = new Ellipsoid("Modified Everest", 6377304.0d, 0.006637847d);
    /** "Modified Fischer 1960" */
    public final static Ellipsoid MODIFIED_FISCHER_1960 = new Ellipsoid("Modified Fischer", 6378155.0d, 0.006693422d);
    /** "South American 1969" */
    public final static Ellipsoid SOUTH_AMERICAN_1969 = new Ellipsoid("South American 1969", 6378160.0d, 0.006694542d);
    /** "WGS 60" */
    public final static Ellipsoid WGS_60 = new Ellipsoid("WSG 60", 6378165.0d, 0.006693422d);
    /** "WGS 66" */
    public final static Ellipsoid WGS_66 = new Ellipsoid("WGS 66", 6378145.0d, 0.006694542d);
    /** "WGS-72" */
    public final static Ellipsoid WGS_72 = new Ellipsoid("WGS 72", 6378135.0d, 0.006694318d);
    /** "WGS-84" */
    public final static Ellipsoid WGS_84 = new Ellipsoid("WGS 84", 6378137.0d, 0.00669438d);

    /**
     * The display name for this ellipsoid.
     */
    public String name;

    /**
     * The equitorial radius for this ellipsoid.
     */
    public double radius;

    /**
     * The square of this ellipsoid's eccentricity.
     */
    public double eccsq;

    /**
     * Constructs a new Ellipsoid instance.
     * 
     * @param radius The earth radius for this ellipsoid.
     * @param eccsq The square of the eccentricity for this ellipsoid.
     */
    public Ellipsoid(String name, double radius, double eccsq) {
        this.name = name;
        this.radius = radius;
        this.eccsq = eccsq;
    }

    /**
     * Returns an array of all available ellipsoids in alphabetical
     * order by name.
     * 
     * @return An Ellipsoid[] array containing all the available
     *         ellipsoids
     */
    public static Ellipsoid[] getAllEllipsoids() {

        Ellipsoid[] all = { AIRY, AUSTRALIAN_NATIONAL, BESSEL_1841,
                BESSEL_1841_NAMIBIA, CLARKE_1866, CLARKE_1880, EVEREST,
                FISHER_1960_MERCURY, FISHER_1968, GRS_1967, GRS_1980,
                HELMERT_1906, HOUGH, INTERNATIONAL, KRASSOVSKY, MODIFIED_AIRY,
                MODIFIED_EVEREST, MODIFIED_FISCHER_1960, SOUTH_AMERICAN_1969,
                WGS_60, WGS_66, WGS_72, WGS_84 };

        return all;
    }

    /**
     * Returns a string representation of the object.
     * 
     * @return String representation
     */
    public String toString() {
        return "Ellipsoid[name=" + name + ", radius=" + radius + ", eccsq="
                + eccsq + "]";
    }
}