经纬度互转

src/services/laglat2gauss.ts

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+// 大地坐标与经纬度坐标互转
+
+
+function GaussToBL(X,Y){
+    let ProjNo;
+    let ZoneWide; 带宽
+    let output = new Array(2);
+    let longitude1,latitude1, longitude0, X0,Y0, xval,yval;//latitude0,
+    let e1,e2,f,a, ee, NN, T,C, M, D,R,u,fai, iPI;
+    iPI = 3.14159265358979324/180.0; 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=1.0/298.257; //80年西安坐标系参数
+    ZoneWide = 6; 6度带宽
+    ProjNo = parseInt(X/1000000) ; //查找带号
+    longitude0 = (ProjNo-1) * ZoneWide + ZoneWide / 2;
+    longitude0 = longitude0 * iPI ; //中央经线
+
+
+    X0 = ProjNo*1000000+500000;
+    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;
+}
+
+//经纬度=>高斯投影
+function BLToGauss(longitude, latitude){
+    let ProjNo=0;
+    let ZoneWide; 带宽
+    let ret=Array(2);
+    let longitude1,latitude1, longitude0,latitude0, X0,Y0, xval,yval;
+    let a,f, e2,ee, NN, T,C,A, M, iPI;
+    iPI = 0.0174532925199433; 3.1415926535898/180.0;
+    ZoneWide = 6; 6度带宽
+    // 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 = parseInt(longitude / ZoneWide) ;
+    longitude0 = ProjNo * ZoneWide + ZoneWide / 2;
+    longitude0 = longitude0 * iPI ;
+    latitude0 = 0;
+    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));
+    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 = 1000000*(ProjNo+1)+500000;
+    Y0 = 0;
+    xval = xval+X0; yval = yval+Y0;
+    ret[0]=xval;
+    ret[1]=yval;
+
+    return ret;
+}
+
+export default {
+    GaussToBL,
+    BLToGauss,
+}