Examples of org.geotools.referencing.GeodeticCalculator

org.geotools.referencing.GeodeticCalculator
Performs geodetic calculations on an {@linkplain Ellipsoid ellipsoid}. This class encapsulates a generic ellipsoid and calculates the following properties:
- Distance and azimuth between two points.
- Point located at a given distance and azimuth from an other point.
The calculation use the following informations:
- The {@linkplain #setStartingPosition starting position}, which is always considered valid. It is initially set at (0,0) and can only be changed to another legitimate value.
- Only one of the following:
  - The {@linkplain #setDestinationPosition destination position}, or
  - An {@linkplain #setDirection azimuth and distance}.
  The latest one set overrides the other and determines what will be calculated.
Note: This class is not thread-safe. If geodetic calculations are needed in a multi-threads environment, create one distinct instance of {@code GeodeticCalculator} for each thread. @since 2.1 @source $URL$ @version $Id$ @author Daniele Franzoni @author Martin Desruisseaux

        Coordinate end = ls.getCoordinateN(1);
        return getGeodeticSegmentLength(start.x, start.y, end.x, end.y);
    }


    private static double getGeodeticSegmentLength(double minx, double miny, double maxx, double maxy) {
        final GeodeticCalculator calculator = new GeodeticCalculator(DefaultGeographicCRS.WGS84);
        double rminx = rollLongitude(minx);
        double rminy = rollLatitude(miny);
        double rmaxx = rollLongitude(maxx);
        double rmaxy = rollLatitude(maxy);
        calculator.setStartingGeographicPoint(rminx, rminy);
        calculator.setDestinationGeographicPoint(rmaxx, rmaxy);
        return calculator.getOrthodromicDistance();
    }

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        boolean latLon;


        public GeographicGenerator(Point center, int quadrantSegments, CoordinateReferenceSystem crs) {
            this.quadrantSegments = quadrantSegments;
            this.center = center;
            this.calculator = new GeodeticCalculator(crs);
            latLon = isLatLonOrder(crs.getCoordinateSystem());
            if (latLon) {
                calculator.setStartingGeographicPoint(center.getY(), center.getX());
            } else {
                calculator.setStartingGeographicPoint(center.getX(), center.getY());

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        boolean latLon;


        public GeographicGenerator(Point center, int quadrantSegments, CoordinateReferenceSystem crs) {
            this.quadrantSegments = quadrantSegments;
            this.center = center;
            this.calculator = new GeodeticCalculator(crs);
            latLon = isLatLonOrder(crs.getCoordinateSystem());
            if (latLon) {
                calculator.setStartingGeographicPoint(center.getY(), center.getX());
            } else {
                calculator.setStartingGeographicPoint(center.getX(), center.getY());

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    setProperty(flow, calculateLength(flow.getGeometry(), crs));
    return flow;
  }
  
  protected double calculateLength(Geometry geometry, CoordinateReferenceSystem crs) {
    GeodeticCalculator geodeticCalculator = new GeodeticCalculator(crs);
    
    Coordinate[] coords = geometry.getCoordinates();


    double totalLength = 0;


    // accumulate the orthodromic distance for every point relation of the given geometry. 
    for (int i = 0; i < (coords.length - 1); i++) {
      Coordinate c1 = coords[i];
      Coordinate c2 = coords[i + 1];
      geodeticCalculator.setStartingGeographicPoint(c1.x, c1.y);
      geodeticCalculator.setDestinationGeographicPoint(c2.x, c2.y);
      totalLength += geodeticCalculator.getOrthodromicDistance();
    }  
    
    return totalLength;
  }

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