Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/DistanceCalculator.java @ 1116:2d393d79c097

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Added author names. gnv-artifacts/trunk@1262 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 04 Nov 2010 21:46:58 +0000
parents f953c9a559d8
children
rev   line source
1115
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.gnv.utils;
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10
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11 import com.vividsolutions.jts.geom.Coordinate;
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12 import com.vividsolutions.jts.geom.Point;
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13
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14 import java.util.List;
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16 /**
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17 * A helper class to calculate distances between points and coordinates.
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18 *
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19 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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20 *
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21 */
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22 public class DistanceCalculator {
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23
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24 private final static double flattening = 1.0 / 298.257233563;
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26 private final static double earthRadius = 6378137.0 / 1000.0 ;
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28 /**
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29 * Constructor
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30 */
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31 public DistanceCalculator() {
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32 }
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34
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35 /**
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36 * Calculates the distance between two points.
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37 *
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38 * @param p1 First point.
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39 * @param p2 Second point.
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40 * @return the distance.
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41 */
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42 public static double calculateDistance(Point p1, Point p2){
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43 return calculateDistance(p1.getCoordinate(), p2.getCoordinate());
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44 }
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47 /**
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48 * Calculates the distance between two coordinates.
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49 *
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50 * @param p1 First coordinate.
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51 * @param p2 Second coordinate.
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52 * @return the distance.
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53 */
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54 public static double calculateDistance(Coordinate p1, Coordinate p2){
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55 double resultValue = 0.0;
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56
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57 double b1 = p1.y;
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58 double b2 = p2.y;
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59
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60 double l1 = p1.x;
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61 double l2 = p2.x;
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64 double F = (b1 + b2) / 2.0;
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65 double G = (b1 - b2) / 2.0;
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66 double l = (l1 - l2) / 2.0;
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67
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68 F = (Math.PI / 180.0) * F;
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69 G = (Math.PI / 180.0) * G;
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70 l = (Math.PI / 180.0) * l;
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72 double S = ((Math.sin(G) * Math.sin(G)) * ((Math.cos(l) * Math.cos(l))))+
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73 ((Math.cos(F) * Math.cos(F)) * ((Math.sin(l) * Math.sin(l))));
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75 double C = ((Math.cos(G) * Math.cos(G)) * ((Math.cos(l) * Math.cos(l))))+
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76 ((Math.sin(F) * Math.sin(F)) * ((Math.sin(l) * Math.sin(l))));
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78 double w = Math.atan(Math.sqrt((S/C)));
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80 double D = 2.0 * w * earthRadius;
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81
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82 double R = Math.sqrt((S*C)) / w;
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84 double H1 = (3.0 * R - 1.0 ) / (2.0 * C);
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85 double H2 = (3.0 * R + 1.0 ) / (2.0 * S);
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86
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87 resultValue = D * (1 + (flattening * H1 * (Math.sin(F) * Math.sin(F)) *
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88 (Math.cos(G) * Math.cos(G))) -
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89 (flattening * H2 * (Math.cos(F) * Math.cos(F)) *
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90 (Math.sin(G) * Math.sin(G))));
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92 return resultValue;
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93 }
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95 /**
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96 * Calculates the length of a path specified by coordinates in <i>path</i>.
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97 *
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98 * @param path A list of coordinates.
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99 * @return the length of the given path.
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100 */
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101 public static final double calculateDistance(List<Coordinate> path) {
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102 int N = path.size();
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103 if (N < 2) {
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104 return 0d;
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105 }
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106 double sum = 0d;
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107 for (int i = 1; i < N; ++i) {
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108 sum += calculateDistance(path.get(i-1), path.get(i));
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109 }
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110 return sum;
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111 }
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112
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113 }
836
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114 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org