java代码实现cgcs2000大地坐标系xy值转化为对应经纬度

Java代码示例如下：

import org.apache.commons.math3.geometry.euclidean.threed.Vector3D;

public class CoordinateConverter {
    private static final double a = 6378137;  // 长半轴
    private static final double b = 6356752.3142;  // 短半轴
    private static final double f = (a - b) / a;  // 扁率
    private static final double e1 = Math.sqrt(2 * f - f * f);  // 第一偏心率
    private static final double e2 = Math.sqrt((a * a - b * b) / (b * b));  // 第二偏心率

    public static Vector3D convertXYToLatLon(double x, double y) {
        // 投影坐标转换为大地坐标
        double Bf0 = x / a;
        double Nf0 = (Math.pow(a, 2) / b) / Math.sqrt(1 + Math.pow(e2, 2) * Math.pow(Math.cos(Bf0), 2));
        double Mf0 = a * (1 - Math.pow(e1, 2)) / Math.pow(Math.sqrt(1 - Math.pow(e1, 2) * Math.pow(Math.sin(Bf0), 2)), 3);
        double nf = Math.sqrt(1 + Math.pow(e2, 2) * Math.pow(Math.cos(Bf0), 2));
        double etaf = e2 * Math.cos(Bf0);
        double T1f = Math.pow(Math.tan(Bf0), 2);
        double C1f = Math.pow(e1, 2) * Math.pow(Math.cos(Bf0), 2);
        double R = a * (1 - Math.pow(e1, 2))
                / Math.pow(Math.sqrt(1 - Math.pow(e1, 2) * Math.pow(Math.sin(Bf0), 2)), 2);

        double latitude = Bf0 - (Nf0 * Math.tan(Bf0) / Mf0)
                * (Math.pow(x, 2) / (2 * R))
                + (Nf0 * Math.tan(Bf0) / (24 * Mf0 * Mf0 * Mf0))
                * ((5 + 3 * T1f + 10 * C1f - 4 * C1f * C1f - 9 * etaf * etaf)
                * Math.pow(x, 4) / 24
                - (61 + 90 * T1f + 298 * C1f + 45 * T1f * T1f - 252 * etaf * etaf - 3 * C1f * C1f)
                * Math.pow(x, 6) / 720);
        double longitude = (x / (nf * Mf0 * Math.cos(Bf0))
                - (1 + 2 * T1f + C1f) * Math.pow(x, 3) / (6 * nf * nf * nf * Mf0 * Math.pow(Math.cos(Bf0), 3))
                + (5 + 28 * T1f + 24 * T1f * T1f + 6 * C1f + 8 * etaf * etaf)
                * Math.pow(x, 5) / (120 * Math.pow(nf, 5) * Mf0 * Math.pow(Math.cos(Bf0), 5)))
                / Math.cos(Bf0);

        return new Vector3D(Math.toDegrees(latitude), Math.toDegrees(longitude), y);
    }

    public static void main(String[] args) {
        double x = 1000000;  // x坐标
        double y = 2000000;  // y坐标

        Vector3D latLon = convertXYToLatLon(x, y);
        System.out.printf("经度：%f, 纬度：%f, 高程：%f", latLon.getY(), latLon.getX(), latLon.getZ());
    }
}

该代码实现了cgcs2000大地坐标系的xy值转化为对应经纬度。在代码中，首先定义了大地坐标系相关参数，如长半轴、短半轴、扁率、偏心率等。然后通过投影坐标转换为大地坐标的公式，计算出经度、纬度和高程，并将结果返回。在main方法中，我们可以指定xy坐标，然后调用转换函数，将结果输出为经度、纬度和高程。