Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/DistanceCalculator.java @ 804:9058c08eac3a

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Added more Javadoc in some classes of state.profile. gnv-artifacts/trunk@886 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 08 Apr 2010 10:10:04 +0000
parents c4156275c1e1
children 2cea76f1112e
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 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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10 *
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11 */
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12 public class DistanceCalculator {
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14 private final static double flattening = 1.0 / 298.257233563;
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16 private final static double earthRadius = 6378137.0 / 1000.0 ;
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18 /**
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19 * Constructor
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20 */
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21 public DistanceCalculator() {
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22 }
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23
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24 public static double calculateDistance(Point p1, Point p2){
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25 return calculateDistance(p1.getCoordinate(), p2.getCoordinate());
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26 }
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27
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28 public static double calculateDistance(Coordinate p1, Coordinate p2){
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29 double resultValue = 0.0;
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31 double b1 = p1.y;
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32 double b2 = p2.y;
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34 double l1 = p1.x;
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35 double l2 = p2.x;
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38 double F = (b1 + b2) / 2.0;
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39 double G = (b1 - b2) / 2.0;
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40 double l = (l1 - l2) / 2.0;
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42 F = (Math.PI / 180.0) * F;
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43 G = (Math.PI / 180.0) * G;
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44 l = (Math.PI / 180.0) * l;
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46 double S = ((Math.sin(G) * Math.sin(G)) * ((Math.cos(l) * Math.cos(l))))+
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47 ((Math.cos(F) * Math.cos(F)) * ((Math.sin(l) * Math.sin(l))));
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49 double C = ((Math.cos(G) * Math.cos(G)) * ((Math.cos(l) * Math.cos(l))))+
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50 ((Math.sin(F) * Math.sin(F)) * ((Math.sin(l) * Math.sin(l))));
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52 double w = Math.atan(Math.sqrt((S/C)));
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54 double D = 2.0 * w * earthRadius;
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56 double R = Math.sqrt((S*C)) / w;
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58 double H1 = (3.0 * R - 1.0 ) / (2.0 * C);
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59 double H2 = (3.0 * R + 1.0 ) / (2.0 * S);
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60
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61 resultValue = D * (1 + (flattening * H1 * (Math.sin(F) * Math.sin(F)) *
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62 (Math.cos(G) * Math.cos(G))) -
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63 (flattening * H2 * (Math.cos(F) * Math.cos(F)) *
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64 (Math.sin(G) * Math.sin(G))));
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66 return resultValue;
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67 }
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68
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69 public static final double calculateDistance(List<Coordinate> path) {
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70 int N = path.size();
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71 if (N < 2) {
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72 return 0d;
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73 }
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74 double sum = 0d;
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75 for (int i = 1; i < N; ++i) {
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76 sum += calculateDistance(path.get(i-1), path.get(i));
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77 }
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78 return sum;
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79 }
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81 }
http://dive4elements.wald.intevation.org