GeoTools program to calculate a wedge shaped polygon 10 degrees wide given a lat,lon radius and azimuth.

CellTower.java

package spike;

import java.awt.geom.Point2D;
import java.util.ArrayList;

import org.geotools.referencing.GeodeticCalculator;
import org.geotools.referencing.crs.DefaultGeographicCRS;

import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.Point;
import com.vividsolutions.jts.geom.Polygon;
import com.vividsolutions.jts.io.WKTWriter;

public class CellTower {

  public static void main(String[] args) {
    CellTower cell = new CellTower(50.0, 0, 10, 30);
    System.out.println(cell);

  }

  private static final GeometryFactory GF = new GeometryFactory();
  private double azimuth;
  private double radius;
  private Point point;
  private Polygon poly;
  private static final GeodeticCalculator CALC = new GeodeticCalculator(DefaultGeographicCRS.WGS84);

 /**
   * Calculate the arc of something from (lat,lon) centred on bearing clockwise from N and length radius
   * @param lat - latitude
   * @param lon - longitude 
   * @param radius - length of arcs in Metres
   * @param azimuth - central bearing of the arc
   */
   
  public CellTower(double lat, double lon, double radius, double azimuth) {
    this.point = GF.createPoint(new Coordinate(lat, lon));
    this.radius = radius;
    this.azimuth = azimuth;
    createPolygon();
  }

  private void createPolygon() {
    
    ArrayList<Coordinate> coords = new ArrayList<>();
    // start at the tower
    coords.add(point.getCoordinate());
    // next the edge of the wedge
    int nSteps = 10;
    // assume width of 10 degrees
    double width = 10.0;
    double dStep = width/nSteps;
    for (int i = -nSteps; i < nSteps; i++) {
      CALC.setStartingGeographicPoint(point.getX(), point.getY());
      CALC.setDirection((azimuth +(i*dStep)), radius);
      Point2D p = CALC.getDestinationGeographicPoint();
      coords.add(new Coordinate(p.getX(), p.getY()));
    }
    // end at the tower
    coords.add(point.getCoordinate());
    poly = GF.createPolygon(coords.toArray(new Coordinate[] {}));

  }

  public String toString() {
    WKTWriter writer = new WKTWriter();
    return writer.write(poly);
  }
}