svn-gvsig-desktop / tags / v1_1_Build_1003 / libraries / libCq CMS for java.old / src / org / cresques / geo / Ellipsoid.java @ 12271
History | View | Annotate | Download (3.91 KB)
1 | 2809 | nacho | /*
|
---|---|---|---|
2 | * Cresques Mapping Suite. Graphic Library for constructing mapping applications.
|
||
3 | *
|
||
4 | * Copyright (C) 2004-5.
|
||
5 | *
|
||
6 | * This program is free software; you can redistribute it and/or
|
||
7 | * modify it under the terms of the GNU General Public License
|
||
8 | * as published by the Free Software Foundation; either version 2
|
||
9 | * of the License, or (at your option) any later version.
|
||
10 | *
|
||
11 | * This program is distributed in the hope that it will be useful,
|
||
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
14 | * GNU General Public License for more details.
|
||
15 | *
|
||
16 | * You should have received a copy of the GNU General Public License
|
||
17 | * along with this program; if not, write to the Free Software
|
||
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
|
||
19 | *
|
||
20 | * For more information, contact:
|
||
21 | *
|
||
22 | * cresques@gmail.com
|
||
23 | */
|
||
24 | 2 | luisw | package org.cresques.geo; |
25 | |||
26 | 93 | luisw | import org.cresques.cts.IDatum; |
27 | |||
28 | 2809 | nacho | |
29 | 93 | luisw | public class Ellipsoid implements IDatum { |
30 | 2809 | nacho | //'WGS72': (6378135.0, 298.26, 1972),
|
31 | public static final Ellipsoid wgs72 = new Ellipsoid("WGS72", 6378135.0, |
||
32 | 298.26);
|
||
33 | 2 | luisw | |
34 | 2809 | nacho | //'WGS84': (6378137.0, 298.257223563, 1984),
|
35 | public static final Ellipsoid wgs84 = new Ellipsoid("WGS84", 6378137.0, |
||
36 | 298.257223563);
|
||
37 | 2 | luisw | |
38 | 2809 | nacho | //'GRS80': (6378137.0, 298.257222101, 1980), // , 6356752.314
|
39 | public static final Ellipsoid grs80 = new Ellipsoid("GRS80", 6378137.0, |
||
40 | 298.257222101);
|
||
41 | |||
42 | //'Hayford': (6378388.0, 297.0, 1909),
|
||
43 | public static final Ellipsoid hayford = new Ellipsoid("Hayford", 6378388.0, |
||
44 | 297.0);
|
||
45 | |||
46 | //'Struve': (6378298.0, 299.73, 1860),
|
||
47 | public static final Ellipsoid struve = new Ellipsoid("Struve", 6378298.0, |
||
48 | 299.73);
|
||
49 | |||
50 | // ed50 ... ?hayford?
|
||
51 | public static final Ellipsoid ed50 = new Ellipsoid("ED50", 6378388.0, 297.0); |
||
52 | |||
53 | // Clarcke 1866 a = 6378206.4; f = 294.9786982;
|
||
54 | public static final Ellipsoid clarke66 = new Ellipsoid("CLARKE 1866", |
||
55 | 6378206.4,
|
||
56 | 294.9786982);
|
||
57 | private String pName = null; |
||
58 | private double pMajor = 0.0; |
||
59 | private double pFlat = 0.0; |
||
60 | public double a; |
||
61 | public double b; |
||
62 | public double f; |
||
63 | public double e; |
||
64 | public double e2; |
||
65 | public double ep; |
||
66 | public double ep2; |
||
67 | |||
68 | public Ellipsoid(String name, double major, double flat) { |
||
69 | pName = name; |
||
70 | pMajor = major; |
||
71 | pFlat = flat; |
||
72 | a = pMajor; |
||
73 | f = pFlat; |
||
74 | ainvto(); |
||
75 | } |
||
76 | |||
77 | public String getName() { |
||
78 | return pName;
|
||
79 | } |
||
80 | |||
81 | private void ainvto() { |
||
82 | b = (a * (pFlat - 1.0D)) / pFlat;
|
||
83 | e2 = ((2D * pFlat) - 1.0D) / (pFlat * pFlat); |
||
84 | e = Math.sqrt(e2);
|
||
85 | ep2 = e2 / (1.0D - e2);
|
||
86 | ep = Math.sqrt(ep2);
|
||
87 | } |
||
88 | |||
89 | private void abto() { |
||
90 | if (Math.abs(a - b) < 9.9999999999999995E-021D) { |
||
91 | pFlat = 0.0D;
|
||
92 | e2 = 0.0D;
|
||
93 | } else {
|
||
94 | pFlat = a / (a - b); |
||
95 | e2 = ((2D * pFlat) - 1.0D) / (pFlat * pFlat); |
||
96 | } |
||
97 | |||
98 | e = Math.sqrt(e2);
|
||
99 | ep2 = e2 / (1.0D - e2);
|
||
100 | ep = Math.sqrt(ep2);
|
||
101 | } |
||
102 | |||
103 | public double[] getParam() { |
||
104 | double[] elipar = new double[8]; |
||
105 | elipar[1] = pMajor;
|
||
106 | elipar[2] = pFlat;
|
||
107 | elipar[3] = b;
|
||
108 | elipar[4] = e;
|
||
109 | elipar[5] = e2;
|
||
110 | elipar[6] = ep;
|
||
111 | elipar[7] = ep2;
|
||
112 | |||
113 | return elipar;
|
||
114 | } |
||
115 | |||
116 | /* (non-Javadoc)
|
||
117 | * @see org.cresques.cts.IDatum#getSemiMajorAxis()
|
||
118 | */
|
||
119 | public double getESemiMajorAxis() { |
||
120 | return pMajor;
|
||
121 | } |
||
122 | |||
123 | /* (non-Javadoc)
|
||
124 | * @see org.cresques.cts.IDatum#getEIFlattening()
|
||
125 | */
|
||
126 | public double getEIFlattening() { |
||
127 | return pFlat;
|
||
128 | } |
||
129 | } |