Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/DistanceCalculator.java @ 809:d05b17a4f3d0

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Added javadoc in describedata package. gnv-artifacts/trunk@891 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 09 Apr 2010 07:27:38 +0000
parents a645bd23c1c8
children 05bf8534a35a
rev   line source
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1 package de.intevation.gnv.utils;
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2
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3 import com.vividsolutions.jts.geom.Coordinate;
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4 import com.vividsolutions.jts.geom.Point;
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5
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6 import java.util.List;
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8 /**
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9 * A helper class to calculate distances between points and coordinates.
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10 *
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11 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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12 *
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13 */
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14 public class DistanceCalculator {
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16 private final static double flattening = 1.0 / 298.257233563;
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18 private final static double earthRadius = 6378137.0 / 1000.0 ;
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20 /**
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21 * Constructor
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22 */
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23 public DistanceCalculator() {
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24 }
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27 /**
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28 * Calculates the distance between two points.
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29 *
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30 * @param p1 First point.
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31 * @param p2 Second point.
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32 * @return the distance.
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33 */
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34 public static double calculateDistance(Point p1, Point p2){
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35 return calculateDistance(p1.getCoordinate(), p2.getCoordinate());
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36 }
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39 /**
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40 * Calculates the distance between two coordinates.
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41 *
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42 * @param p1 First coordinate.
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43 * @param p2 Second coordinate.
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44 * @return the distance.
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45 */
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46 public static double calculateDistance(Coordinate p1, Coordinate p2){
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47 double resultValue = 0.0;
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48
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49 double b1 = p1.y;
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50 double b2 = p2.y;
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52 double l1 = p1.x;
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53 double l2 = p2.x;
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56 double F = (b1 + b2) / 2.0;
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57 double G = (b1 - b2) / 2.0;
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58 double l = (l1 - l2) / 2.0;
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60 F = (Math.PI / 180.0) * F;
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61 G = (Math.PI / 180.0) * G;
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62 l = (Math.PI / 180.0) * l;
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64 double S = ((Math.sin(G) * Math.sin(G)) * ((Math.cos(l) * Math.cos(l))))+
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65 ((Math.cos(F) * Math.cos(F)) * ((Math.sin(l) * Math.sin(l))));
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67 double C = ((Math.cos(G) * Math.cos(G)) * ((Math.cos(l) * Math.cos(l))))+
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68 ((Math.sin(F) * Math.sin(F)) * ((Math.sin(l) * Math.sin(l))));
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70 double w = Math.atan(Math.sqrt((S/C)));
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72 double D = 2.0 * w * earthRadius;
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74 double R = Math.sqrt((S*C)) / w;
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76 double H1 = (3.0 * R - 1.0 ) / (2.0 * C);
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77 double H2 = (3.0 * R + 1.0 ) / (2.0 * S);
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78
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79 resultValue = D * (1 + (flattening * H1 * (Math.sin(F) * Math.sin(F)) *
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80 (Math.cos(G) * Math.cos(G))) -
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81 (flattening * H2 * (Math.cos(F) * Math.cos(F)) *
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82 (Math.sin(G) * Math.sin(G))));
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83
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84 return resultValue;
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85 }
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86
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87 /**
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88 * Calculates the length of a path specified by coordinates in <i>path</i>.
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89 *
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90 * @param path A list of coordinates.
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91 * @return the length of the given path.
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92 */
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93 public static final double calculateDistance(List<Coordinate> path) {
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94 int N = path.size();
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95 if (N < 2) {
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96 return 0d;
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97 }
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98 double sum = 0d;
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99 for (int i = 1; i < N; ++i) {
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100 sum += calculateDistance(path.get(i-1), path.get(i));
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101 }
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102 return sum;
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103 }
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104
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105 }
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106 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org