在Java中ECEF到lla(lat,lon,alt) [英] ECEF to lla (lat,lon,alt) in java
问题描述
作为头条说,我试图从ecef转换为lla。
我正在使用此文档:转换文章直接公式中的
,而不是迭代公式
和此网站进行结果比较: ECEF2LLA
我在java中开发所以我的代码如下:
public static final double a = 6378137;
public static final double f = 1 / 298.257223563;
public static final double b = a *(1-f);
public static final double e = Math.sqrt((Math.pow(a,2)-Math.pow(b,2))/ Math.pow(a,2));
public static final double e2 = Math.sqrt((Math.pow(a,2)-Math.pow(b,2))/ Math.pow(b,2));
public static double [] ecef2lla(double x,double y,double z){
double [] lla = {0,0,0};
double lon,lat,height,N;
double p = Math.sqrt(Math.pow(x,2)+ Math.pow(y,2));
double theta = Math.atan((z * a)/(p * b));
lon = Math.atan(y / x);
lon = lon * 180 / Math.PI;
lat = Math.atan(((z + Math.pow(e2,2)* b * Math.pow(Math.sin(theta),3))/((p-Math。 pow(e,2)* a * Math.pow(Math.cos(theta),3)))));
lat =(lat * 180)/Math.PI;
N = a /(Math.sqrt(1-Math.pow(e * Math.sin(lat),2)));
height =(p / Math.cos(theta)) - N;
lla [0] = lon;
lla [1] = lat;
lla [2] =高度;
返回lla;
}
我收到错误的高度数据。
我已经尝试移动到弧度和度数,什么不是。
预先感谢您!
好的,我得到了这个工作。
问题是一个错位的变量,所以为了我们的未来,工作JAVA实现:
public static final double a = 6378137;
public static final double f = 0.0034;
public static final double b = 6.3568e6;
public static final double e = Math.sqrt((Math.pow(a,2) - Math.pow(b,2))/ Math.pow(a,2));
public static final double e2 = Math.sqrt((Math.pow(a,2) - Math.pow(b,2))/ Math.pow(b,2));
public static double [] ecef2lla(double x,double y,double z){
double [] lla = {0,0,0};
double lan,lon,height,N,theta,p;
p = Math.sqrt(Math.pow(x,2)+ Math.pow(y,2));
theta = Math.atan((z * a)/(p * b));
lon = Math.atan(y / x);
lat = Math.atan(((z + Math.pow(e2,2)* b * Math.pow(Math.sin(theta),3))/((p - Math。 pow(e,2)* a * Math.pow(Math.cos(theta),3)))));
N = a /(Math.sqrt(1 - (Math.pow(e,2)* Math.pow(Math.sin(lat),2))));
double m =(p / Math.cos(lat));
height = m - N;
lon = lon * 180 / Math.PI;
lat = lat * 180 / Math.PI;
lla [0] = lat;
lla [1] = lon;
lla [2] =高度;
返回lla;
注意: ECEF XYZ 位于米!
Ive looked through the posts in the site and haven't found my problem ... as the head line says im trying to convert from ecef to lla .
I'm using this document : Conversion article in the direct formula , not the iterate formula and this site for result comparison : ECEF2LLA
Im developing in java so my code is as follows :
public static final double a = 6378137;
public static final double f = 1/298.257223563;
public static final double b = a*(1-f);
public static final double e = Math.sqrt((Math.pow(a, 2)-Math.pow(b, 2))/Math.pow(a, 2));
public static final double e2 = Math.sqrt((Math.pow(a, 2)-Math.pow(b, 2))/Math.pow(b, 2));
public static double[] ecef2lla(double x , double y , double z){
double[] lla = {0,0,0};
double lon,lat,height,N;
double p = Math.sqrt(Math.pow(x, 2)+Math.pow(y, 2));
double theta = Math.atan((z*a)/(p*b));
lon = Math.atan(y/x);
lon = lon*180/Math.PI;
lat = Math.atan(((z+Math.pow(e2, 2)*b*Math.pow(Math.sin(theta), 3))/((p-Math.pow(e,2)*a*Math.pow(Math.cos(theta), 3)))));
lat = (lat*180)/Math.PI;
N= a/(Math.sqrt(1-Math.pow(e*Math.sin(lat), 2)));
height = (p/Math.cos(theta)) - N;
lla[0] = lon;
lla[1] = lat;
lla[2] = height;
return lla;
}
I'm getting wrong height data. I've tried to move to radians and degrees and what not .
Thank you in advance !
OK so i got this working.
The problem was a misplaced variable, so for the sake of our future here's the working JAVA implementation :
public static final double a = 6378137;
public static final double f = 0.0034;
public static final double b = 6.3568e6;
public static final double e = Math.sqrt((Math.pow(a, 2) - Math.pow(b, 2)) / Math.pow(a, 2));
public static final double e2 = Math.sqrt((Math.pow(a, 2) - Math.pow(b, 2)) / Math.pow(b, 2));
public static double[] ecef2lla(double x, double y, double z) {
double[] lla = { 0, 0, 0 };
double lan, lon, height, N , theta, p;
p = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));
theta = Math.atan((z * a) / (p * b));
lon = Math.atan(y / x);
lat = Math.atan(((z + Math.pow(e2, 2) * b * Math.pow(Math.sin(theta), 3)) / ((p - Math.pow(e, 2) * a * Math.pow(Math.cos(theta), 3)))));
N = a / (Math.sqrt(1 - (Math.pow(e, 2) * Math.pow(Math.sin(lat), 2))));
double m = (p / Math.cos(lat));
height = m - N;
lon = lon * 180 / Math.PI;
lat = lat * 180 / Math.PI;
lla[0] = lat;
lla[1] = lon;
lla[2] = height;
return lla;
}
Note : The units for the ECEF X Y Z are in Meters !
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