最近统计数据，需要计算两个坐标点之间的距离，所以当成笔记记录下来。
主要运用了JTS空间分析工具包，提供一系列的空间数据分析操作。
1.下载或maven依赖
工具包下载地址：jts工具包
maven依赖：
<dependency>
<groupId>com.vividsolutions</groupId>
<artifactId>jts</artifactId>
<version>1.13</version>
</dependency>2.计算两点距离
/**
*
* @title 计算点与点的距离
* @param pointA
* @param pointB
* @description 注意pointA,pointB中的经纬度坐标都是火星坐标
* @return
* @author huaqunzi
*/
public static double distanceToPoint(PointEntity pointA,PointEntity pointB){
//jts提供的几何要素工厂类
GeometryFactory geometryFactory = new GeometryFactory();
//火星坐标(gcj02)转GPS坐标(WGS84)
double[] wgsPntA = CoordinateUtil.gcj02_To_Wgs84(pointA.x,pointA.y);
double[] wgsPntB = CoordinateUtil.gcj02_To_Wgs84(pointB.x,pointB.y);
//WGS84->高斯6度分带投影
double[] gaussPntA = wgs84_To_Gauss6(wgsPntA[0], wgsPntA[1]);
double[] gaussPntB = wgs84_To_Gauss6(wgsPntB[0], wgsPntB[1]);
//通过几何要素工厂得到point实体
Point pntA = geometryFactory.createPoint(new Coordinate(gaussPntA[0], gaussPntA[1]));
Point pntB = geometryFactory.createPoint(new Coordinate(gaussPntB[0], gaussPntB[1]));
// 两点距离
return pntA.distance(pntB);
}
/**
* @Description WGS84 to 高斯投影(6度分带)
* @param longitude 经度
* @param latitude 纬度
* @return double[] x y
*/
public static double[] wgs84_To_Gauss6(double longitude, double latitude) {
int ProjNo = 0;
int ZoneWide; // //带宽
double[] output = new double[2];
double longitude1, latitude1, longitude0, X0, Y0, xval, yval;
double a, f, e2, ee, NN, T, C, A, M, iPI;
iPI = 0.0174532925199433; // //3.1415926535898/180.0;
ZoneWide = 6; //6度带宽
a = 6378137.0;
f = 1.0 / 298.257223563; //WGS84坐标系参数
//a = 6378245.0;f = 1.0 / 298.3; // 54年北京坐标系参数
// //a=6378140.0; f=1/298.257; //80年西安坐标系参数
ProjNo = (int) (longitude / ZoneWide);
longitude0 = (double)(ProjNo * ZoneWide + ZoneWide / 2);
longitude0 = longitude0 * iPI;
longitude1 = longitude * iPI; // 经度转换为弧度
latitude1 = latitude * iPI; // 纬度转换为弧度
e2 = 2 * f - f * f;
ee = e2 / (1.0 - e2);
NN = a
/ Math.sqrt(1.0 - e2 * Math.sin(latitude1)
* Math.sin(latitude1));
T = Math.tan(latitude1) * Math.tan(latitude1);
C = ee * Math.cos(latitude1) * Math.cos(latitude1);
A = (longitude1 - longitude0) * Math.cos(latitude1);
M = a
* ((1 - e2 / 4 - 3 * e2 * e2 / 64 - 5 * e2 * e2 * e2 / 256)
* latitude1
- (3 * e2 / 8 + 3 * e2 * e2 / 32 + 45 * e2 * e2 * e2
/ 1024) * Math.sin(2 * latitude1)
+ (15 * e2 * e2 / 256 + 45 * e2 * e2 * e2 / 1024)
* Math.sin(4 * latitude1) - (35 * e2 * e2 * e2 / 3072)
* Math.sin(6 * latitude1));
// 因为是以赤道为Y轴的，与我们南北为Y轴是相反的，所以xy与高斯投影的标准xy正好相反;
xval = NN
* (A + (1 - T + C) * A * A * A / 6 + (5 - 18 * T + T * T + 14
* C - 58 * ee)
* A * A * A * A * A / 120);
yval = M
+ NN
* Math.tan(latitude1)
* (A * A / 2 + (5 - T + 9 * C + 4 * C * C) * A * A * A * A / 24 + (61
- 58 * T + T * T + 270 * C - 330 * ee)
* A * A * A * A * A * A / 720);
X0 = 1000000L * (ProjNo + 1) + 500000L;
Y0 = 0;
xval = xval + X0;
yval = yval + Y0;
output[0] = xval;
output[1] = yval;
return output;
}
PointEntity实体类：
/**
*
* @Description: 坐标实体
*/
public class PointEntity implements Serializable {
/**
*序列化名称
*/
private static final long serialVersionUID = 1L;
/**
* 纬度
*/
public Double x;
/**
* 经度
*/
public Double y;
/**
*
* @param cx
* @param cy
*/
public Point(Double cx,Double cy) {
x = cx;
y = cy;
}
}
坐标转换工具类：
/**
* @Description 坐标标转换工具类
*/
public class CoordinateUtil {
/**
* pi
*/
public final static double pi = 3.1415926535897932384626;
/**
* a
*/
public final static double a = 6378245.0;
/**
* ee
*/
public final static double ee = 0.00669342162296594323;
/**
* @Description WGS84 to 火星坐标系 (GCJ-02)
* @param lon
* @param lat
* @return
*/
public static double[] wgs84_To_Gcj02(double lon, double lat) {
if (outOfChina(lat, lon)) {
return null;
}
double dLat = transformLat(lon - 105.0, lat - 35.0);
double dLon = transformLon(lon - 105.0, lat - 35.0);
double radLat = lat / 180.0 * pi;
double magic = Math.sin(radLat);
magic = 1 - ee * magic * magic;
double sqrtMagic = Math.sqrt(magic);
dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
double mgLat = lat + dLat;
double mgLon = lon + dLon;
return new double[] { mgLon, mgLat };
}
/**
* @Description 火星坐标系 (GCJ-02) to WGS84
* @param lon
* @param lat
* @return
*/
public static double[] gcj02_To_Wgs84(double lon, double lat) {
double[] gps = transform(lat, lon);
double lontitude = lon * 2 - gps[1];
double latitude = lat * 2 - gps[0];
return new double[] { lontitude, latitude };
}
/**
* @Description 火星坐标系 (GCJ-02) to 百度坐标系 (BD-09)
* @param gg_lon
* @param gg_lat
* @return
*/
public static double[] gcj02_To_Bd09(double gg_lon, double gg_lat) {
double x = gg_lon, y = gg_lat;
double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * pi);
double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * pi);
double bd_lon = z * Math.cos(theta) + 0.0065;
double bd_lat = z * Math.sin(theta) + 0.006;
return new double[] { bd_lon, bd_lat };
}
/**
* @Description 百度坐标系 (BD-09) to 火星坐标系 (GCJ-02)
* @param bd_lon
* @param bd_lat
* @return
*/
public static double[] bd09_To_Gcj02(double bd_lon, double bd_lat) {
double x = bd_lon - 0.0065, y = bd_lat - 0.006;
double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * pi);
double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * pi);
double gg_lon = z * Math.cos(theta);
double gg_lat = z * Math.sin(theta);
return new double[] { gg_lon, gg_lat };
}
/**
* @Description 百度坐标系 (BD-09) to WGS84
* @param bd_lat
* @param bd_lon
* @return
*/
public static double[] bd09_To_Wgs84(double bd_lon,double bd_lat) {
double[] gcj02 = CoordinateUtil.bd09_To_Gcj02(bd_lon, bd_lat);
double[] map84 = CoordinateUtil.gcj02_To_Wgs84(gcj02[0], gcj02[1]);
return map84;
}
/**
* @Description 判断是否在中国范围内
* @param lat
* @param lon
* @return
*/
public static boolean outOfChina(double lat, double lon) {
if (lon < 72.004 || lon > 137.8347)
return true;
if (lat < 0.8293 || lat > 55.8271)
return true;
return false;
}
/**
* @Description transform
* @param lat
* @param lon
* @return
*/
private static double[] transform(double lat, double lon) {
if (outOfChina(lat, lon)) {
return new double[] { lat, lon };
}
double dLat = transformLat(lon - 105.0, lat - 35.0);
double dLon = transformLon(lon - 105.0, lat - 35.0);
double radLat = lat / 180.0 * pi;
double magic = Math.sin(radLat);
magic = 1 - ee * magic * magic;
double sqrtMagic = Math.sqrt(magic);
dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
double mgLat = lat + dLat;
double mgLon = lon + dLon;
return new double[] { mgLat, mgLon };
}
/**
* @Description transformLat
* @param x
* @param y
* @return
*/
private static double transformLat(double x, double y) {
double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y
+ 0.2 * Math.sqrt(Math.abs(x));
ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
return ret;
}
/**
* @Description transformLon
* @param x
* @param y
* @return
*/
public static double transformLon(double x, double y) {
double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1
* Math.sqrt(Math.abs(x));
ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0
* pi)) * 2.0 / 3.0;
return ret;
}
}
测试一下
public static void main(String[] args) {
//108.32222,22.81704;108.322174,22.818055;
Point pointA = new Point(22.81704,108.32222);
Point pointB = new Point(22.818055,108.322174);
double d = distanceToPoint(pointA,pointB);
System.out.println(d);
}结果：35.996601107188795
jts是一个很强大的工具包，感兴趣的童鞋可以了解一下jts更多的东西。