자바 geotools 15.1 좌표간 거리계산

import org.geotools.geometry.jts.JTS;
import org.geotools.referencing.CRS;
import org.geotools.referencing.GeodeticCalculator;
import org.opengis.referencing.crs.CoordinateReferenceSystem;

import com.vividsolutions.jts.geom.Coordinate;

public class GeoDistanceTest { 

 private CoordinateReferenceSystem sourceCRS;
 private String sourceX;
 private String sourceY;
 
 public GeoDistanceTest(String sourceCRS, String sourceX, String sourceY) throws Exception {
  this.sourceCRS = CRS.decode(sourceCRS);
  this.sourceX = sourceX;
  this.sourceY = sourceY;
  
 }
 
 public void distanceCalculator(String x, String y) throws Exception {
  
  GeodeticCalculator gc = new GeodeticCalculator(sourceCRS);
  
  gc.setStartingPosition(JTS.toDirectPosition(new Coordinate(Double.parseDouble(sourceX), Double.parseDouble(sourceY)),sourceCRS));
  gc.setDestinationPosition(JTS.toDirectPosition(new Coordinate(Double.parseDouble(x), Double.parseDouble(y)),sourceCRS));
  
  double distance = gc.getOrthodromicDistance();
  
  System.out.println("distance (m) : "+ distance);
 } 
 
 public static void main(String[] args) throws Exception {
  
  GeoDistanceTest g = new GeoDistanceTest("EPSG:4326", "37.5639686", "126.9794393");

  g.distanceCalculator("37.5639686", "126.9794393");
     
 }

}