/**

* 地图工具

*

* @author dxm

*

*/

public class MapUtil {

// 参考点

private double[] d34 = null;

private double[] d33 = null;

private double[] gs34 = null;

private double[] gs33 = null;

// 参考点位置

private double x34, y34;

// 计算参数

private double a, b, c, bl;

/**

* 构造器

*

* @param ds34 参考点经纬度

* @param ds33 参考点经纬度

* @param length 两个参考点在本坐标系长度

*/

public MapUtil(String[] ds34, String[] ds33, double x34, double y34, double length) {

this.x34 = x34;

this.y34 = y34;

d34 = convertGPS(ds34[0], ds34[1]);

d33 = convertGPS(ds33[0], ds33[1]);

gs34 = BLToGauss(d34[0], d34[1]);

gs33 = BLToGauss(d33[0], d33[1]);

// 点33到点34的高斯横向距离

a = gs34[0] - gs33[0];

// 点33到点34的高斯纵向距离

b = gs34[1] - gs33[1];

// 点33到点34的高斯直线距离

c = Math.sqrt(a * a + b * b);

// 高斯距离与本坐标系的比例

bl = length / c;

}

/**

* 根据经纬度算XY

*

* @param lng

* @param lat

* @return

*/

public int[] getXY(double lng, double lat) {

// 与参考点比较经度计算坐标

if (lng > d34[0]) {

return getXY1(lng, lat);

} else {

return getXY2(lng, lat);

}

}

/**

* 已有定点为基准算XY坐标

*/

private int[] getXY1(double lng, double lat) {

// 将经纬度转换为高斯投影坐标

double[] gs = BLToGauss(lng, lat);

// 与点34的横向高斯距离

double d = Math.abs(gs[0] - gs34[0]);

double e = d * c / b;

double f = a * e / c;

// 与点34的纵向高斯距离

double gf = Math.abs(gs[1] - gs34[1]);

double g = gf - f;

double h = a * g / c;

double i = b * g / c;

double x = x34 - i * bl;

double y = y34 + (h + e) * bl;

return new int[] { (int) Math.rint(x), (int) Math.rint(y) };

}

/**

* 已有定点为基准算XY坐标

*/

private int[] getXY2(double lng, double lat) {

// 将经纬度转换为高斯投影坐标

double[] gs = BLToGauss(lng, lat);

// 与点34的横向高斯距离

double d = Math.abs(gs[0] - gs34[0]);

double e = d * c / a;

double f = e * b / c;

// 与点34的纵向高斯距离

double gf = Math.abs(gs[1] - gs34[1]);

double g = gf - f;

double h = a * g / c;

double i = b * g / c;

double x = x34 - (e + i) * bl;

double y = y34 + h * bl;

return new int[] { (int) Math.rint(x), (int) Math.rint(y) };

}

/**

* 经纬度度分秒转带小数点的度

*

* @param jw

* @return

*/

private double[] convertGPS(String lng, String lat) {

lng = lng.replaceAll("N", "");

lng = lng.replaceAll("S", "");

lng = lng.replaceAll("E", "");

lng = lng.replaceAll("W", "");

lat = lat.replaceAll("N", "");

lat = lat.replaceAll("S", "");

lat = lat.replaceAll("E", "");

lat = lat.replaceAll("W", "");

double lngD = 0;

String[] fs = lng.split("°");

if (fs.length > 0) {

lngD = Double.parseDouble(fs[0]);

}

fs = fs[1].split("′");

if (fs.length > 0) {

double fen = Double.parseDouble(fs[0]);

fen = fen / 60;

lngD += fen;

}

fs = fs[1].split("″");

if (fs.length > 0) {

double mi = Double.parseDouble(fs[0]);

mi = mi / (60 * 60);

lngD += mi;

}

double latD = 0;

fs = lat.split("°");

if (fs.length > 0) {

latD = Double.parseDouble(fs[0]);

}

fs = fs[1].split("′");

if (fs.length > 0) {

double fen = Double.parseDouble(fs[0]);

fen = fen / 60;

latD += fen;

}

fs = fs[1].split("″");

if (fs.length > 0) {

double mi = Double.parseDouble(fs[0]);

mi = mi / (60 * 60);

latD += mi;

}

return new double[] { lngD, latD };

}

/**

* 由高斯投影坐标反算成经纬度

*

* @param X

* @param Y

* @return

*/

@SuppressWarnings("unused")

private double[] GaussToBL(double X, double Y) {

int ProjNo;

int ZoneWide; // //带宽

double[] output = new double[2];

double longitude1, latitude1, longitude0, X0, Y0, xval, yval;// latitude0,

double e1, e2, f, a, ee, NN, T, C, M, D, R, u, fai, iPI;

iPI = 0.0174532925199433; // //3.1415926535898/180.0;

// 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

ZoneWide = 6; // //6度带宽

ProjNo = (int) (X / 1000000L); // 查找带号

longitude0 = (ProjNo - 1) * ZoneWide + ZoneWide / 2;

longitude0 = longitude0 * iPI; // 中央经线

X0 = ProjNo * 1000000L + 500000L;

Y0 = 0;

xval = X - X0;

yval = Y - Y0; // 带内大地坐标

e2 = 2 * f - f * f;

e1 = (1.0 - Math.sqrt(1 - e2)) / (1.0 + Math.sqrt(1 - e2));

ee = e2 / (1 - e2);

M = yval;

u = M / (a * (1 - e2 / 4 - 3 * e2 * e2 / 64 - 5 * e2 * e2 * e2 / 256));

fai = u + (3 * e1 / 2 - 27 * e1 * e1 * e1 / 32) * Math.sin(2 * u) + (21 * e1 * e1 / 16 - 55 * e1 * e1 * e1 * e1 / 32) * Math.sin(4 * u) + (151 * e1 * e1 * e1 / 96) * Math.sin(6 * u) + (1097 * e1 * e1 * e1 * e1 / 512) * Math.sin(8 * u);

C = ee * Math.cos(fai) * Math.cos(fai);

T = Math.tan(fai) * Math.tan(fai);

NN = a / Math.sqrt(1.0 - e2 * Math.sin(fai) * Math.sin(fai));

R = a * (1 - e2) / Math.sqrt((1 - e2 * Math.sin(fai) * Math.sin(fai)) * (1 - e2 * Math.sin(fai) * Math.sin(fai)) * (1 - e2 * Math.sin(fai) * Math.sin(fai)));

D = xval / NN;

// 计算经度(Longitude) 纬度(Latitude)

longitude1 = longitude0 + (D - (1 + 2 * T + C) * D * D * D / 6 + (5 - 2 * C + 28 * T - 3 * C * C + 8 * ee + 24 * T * T) * D * D * D * D * D / 120) / Math.cos(fai);

latitude1 = fai - (NN * Math.tan(fai) / R) * (D * D / 2 - (5 + 3 * T + 10 * C - 4 * C * C - 9 * ee) * D * D * D * D / 24 + (61 + 90 * T + 298 * C + 45 * T * T - 256 * ee - 3 * C * C) * D * D * D * D * D * D / 720);

// 转换为度 DD

output[0] = longitude1 / iPI;

output[1] = latitude1 / iPI;

return output;

}

/**

* 由经纬度反算成高斯投影坐标

*

* @param longitude

* @param latitude

*/

private double[] BLToGauss(double longitude, double latitude) {

int ProjNo = 0;

// 带宽

int ZoneWide = 6;

double longitude1, latitude1, longitude0, X0, Y0, xval, yval;

double a, f, e2, ee, NN, T, C, A, M, iPI;

// 3.1415926535898/180.0;

iPI = 0.0174532925199433;

// 54年北京坐标系参数

a = 6378245.0;

f = 1.0 / 298.3;

// 80年西安坐标系参数

// a=6378140.0;

// f=1/298.257;

ProjNo = (int) (longitude / ZoneWide);

longitude0 = ProjNo * ZoneWide + ZoneWide / 2;

longitude0 = longitude0 * iPI;

// 经度转换为弧度

longitude1 = longitude * iPI;

// 纬度转换为弧度

latitude1 = latitude * iPI;

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));

xval = NN * (A + (1 - T + C) * A * A * A / 6 + (5 - 18 * T + T * T + 72 * 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 + 600 * C - 330 * ee) * A * A * A * A * A * A / 720);

X0 = 1000000L * (ProjNo + 1) + 500000L;

Y0 = 0;

xval = xval + X0;

yval = yval + Y0;

return new double[] { xval, yval };

}

}