Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/DistanceCalculator.java @ 594:5b9b74c08bbb

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Changed Method signatures because of Interfacemodifications in the Artifact-Module gnv-artifacts/trunk@650 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Mon, 01 Feb 2010 14:03:01 +0000
parents 1ab23cd66870
children 9a828e5a2390
rev   line source
185
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
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parents:
diff changeset
1 /**
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
Tim Englich <tim.englich@intevation.de>
parents:
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2 *
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
Tim Englich <tim.englich@intevation.de>
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3 */
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
Tim Englich <tim.englich@intevation.de>
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4 package de.intevation.gnv.utils;
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5
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
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6 import com.vividsolutions.jts.geom.Point;
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7 import com.vividsolutions.jts.geom.Coordinate;
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8
1ab23cd66870 Added result set handling. Needs some testing.
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9 import java.util.List;
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10
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
Tim Englich <tim.englich@intevation.de>
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11 /**
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
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12 * @author Tim Englich <tim.englich@intevation.de>
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
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parents:
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13 *
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
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parents:
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14 */
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
Tim Englich <tim.englich@intevation.de>
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15 public class DistanceCalculator {
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
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16
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
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17 private final static double flattening = 1.0 / 298.257233563;
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18
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
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19 private final static double earthRadius = 6378137.0 / 1000.0 ;
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20
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
Tim Englich <tim.englich@intevation.de>
parents:
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21 /**
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
Tim Englich <tim.englich@intevation.de>
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22 * Constructor
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
Tim Englich <tim.englich@intevation.de>
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23 */
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
Tim Englich <tim.englich@intevation.de>
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24 public DistanceCalculator() {
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25 }
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
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26
296
da1499a464b9 Declared a method as static to use it without instantiating an object of its class.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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27 public static double calculateDistance(Point p1, Point p2){
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28 return calculateDistance(p1.getCoordinate(), p2.getCoordinate());
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29 }
1ab23cd66870 Added result set handling. Needs some testing.
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30
1ab23cd66870 Added result set handling. Needs some testing.
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31 public static double calculateDistance(Coordinate p1, Coordinate p2){
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32 double resultValue = 0.0;
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33
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34 double b1 = p1.y;
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35 double b2 = p2.y;
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36
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37 double l1 = p1.x;
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38 double l2 = p2.x;
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39
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
Tim Englich <tim.englich@intevation.de>
parents:
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40
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
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41 double F = (b1 + b2) / 2.0;
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
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42 double G = (b1 - b2) / 2.0;
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
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43 double l = (l1 - l2) / 2.0;
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
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parents:
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44
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
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45 F = (Math.PI / 180.0) * F;
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46 G = (Math.PI / 180.0) * G;
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47 l = (Math.PI / 180.0) * l;
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parents:
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48
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49 double S = ((Math.sin(G) * Math.sin(G)) * ((Math.cos(l) * Math.cos(l))))+
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50 ((Math.cos(F) * Math.cos(F)) * ((Math.sin(l) * Math.sin(l))));
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51
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52 double C = ((Math.cos(G) * Math.cos(G)) * ((Math.cos(l) * Math.cos(l))))+
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53 ((Math.sin(F) * Math.sin(F)) * ((Math.sin(l) * Math.sin(l))));
5fc8f41669a6 Added Calculation of the Distance in the unit km for Geodetic-Coordinates according to the Specification GT_0030.004
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54
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55 double w = Math.atan(Math.sqrt((S/C)));
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56
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57 double D = 2.0 * w * earthRadius;
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58
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59 double R = Math.sqrt((S*C)) / w;
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60
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61 double H1 = (3.0 * R - 1.0 ) / (2.0 * C);
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62 double H2 = (3.0 * R + 1.0 ) / (2.0 * S);
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63
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64 resultValue = D * (1 + (flattening * H1 * (Math.sin(F) * Math.sin(F)) *
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65 (Math.cos(G) * Math.cos(G))) -
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66 (flattening * H2 * (Math.cos(F) * Math.cos(F)) *
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67 (Math.sin(G) * Math.sin(G))));
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68
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69 return resultValue;
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70 }
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71
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72 public static final double calculateDistance(List<Coordinate> path) {
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73 int N = path.size();
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74 if (N < 2) {
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75 return 0d;
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76 }
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77 double sum = 0d;
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78 for (int i = 1; i < N; ++i) {
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79 sum += calculateDistance(path.get(i-1), path.get(i));
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80 }
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81 return sum;
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82 }
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83
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84 }
http://dive4elements.wald.intevation.org