Mercurial > dive4elements > gnv-client
view gnv-artifacts/src/main/java/de/intevation/gnv/utils/DistanceCalculator.java @ 201:54c733c59321
Changed Configuration Folder to doc/conf
gnv-artifacts/trunk@255 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Tim Englich <tim.englich@intevation.de> |
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date | Wed, 21 Oct 2009 10:27:30 +0000 |
parents | 5fc8f41669a6 |
children | da1499a464b9 |
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/** * */ package de.intevation.gnv.utils; import com.vividsolutions.jts.geom.Point; /** * @author Tim Englich <tim.englich@intevation.de> * */ public class DistanceCalculator { private final static double flattening = 1.0 / 298.257233563; private final static double earthRadius = 6378137.0 / 1000.0 ; /** * Constructor */ public DistanceCalculator() { } public double calculateDistance(Point p1, Point p2){ double resultValue = 0.0; double b1 = p1.getY(); double b2 = p2.getY(); double l1 = p1.getX(); double l2 = p2.getX(); double F = (b1 + b2) / 2.0; double G = (b1 - b2) / 2.0; double l = (l1 - l2) / 2.0; F = (Math.PI / 180.0) * F; G = (Math.PI / 180.0) * G; l = (Math.PI / 180.0) * l; double S = ((Math.sin(G) * Math.sin(G)) * ((Math.cos(l) * Math.cos(l))))+ ((Math.cos(F) * Math.cos(F)) * ((Math.sin(l) * Math.sin(l)))); double C = ((Math.cos(G) * Math.cos(G)) * ((Math.cos(l) * Math.cos(l))))+ ((Math.sin(F) * Math.sin(F)) * ((Math.sin(l) * Math.sin(l)))); double w = Math.atan(Math.sqrt((S/C))); double D = 2.0 * w * earthRadius; double R = Math.sqrt((S*C)) / w; double H1 = (3.0 * R - 1.0 ) / (2.0 * C); double H2 = (3.0 * R + 1.0 ) / (2.0 * S); resultValue = D * (1 + (flattening * H1 * (Math.sin(F) * Math.sin(F)) * (Math.cos(G) * Math.cos(G))) - (flattening * H2 * (Math.cos(F) * Math.cos(F)) * (Math.sin(G) * Math.sin(G)))); return resultValue; } }