wgs84转cgcs2000 java_CGCS2000坐标系与WGS84的相互投影转换

要将坐标从WGS84投影到CGCS2000或从CGCS2000投影到WGS84，需要使用适当的转换参数。以下是Java代码示例，演示如何将WGS84坐标系转换为CGCS2000坐标系：

import org.geotools.referencing.CRS;
import org.geotools.referencing.crs.DefaultGeographicCRS;
import org.geotools.referencing.operation.DefaultCoordinateOperationFactory;
import org.geotools.referencing.operation.MathTransform;

public class WGS84ToCGCS2000 {

    public static void main(String[] args) throws Exception {
        // Define WGS84 CRS
        String wgs84 = "EPSG:4326";
        // Define CGCS2000 CRS
        String cgcs2000 = "EPSG:4490";

        // Define WGS84 coordinates
        double lat = 39.9;
        double lon = 116.3;

        // Create coordinate operation factory
        DefaultCoordinateOperationFactory factory = new DefaultCoordinateOperationFactory();

        // Create math transform from WGS84 to CGCS2000
        MathTransform transform = factory.createOperation(
                CRS.decode(wgs84),
                CRS.decode(cgcs2000),
                null).getMathTransform();

        // Transform WGS84 coordinates to CGCS2000
        double[] source = new double[]{lon, lat};
        double[] target = new double[2];
        transform.transform(source, 0, target, 0, 1);

        // Print CGCS2000 coordinates
        System.out.println("CGCS2000 coordinates: " + target[0] + ", " + target[1]);
    }
}

同样，如果要将坐标从CGCS2000投影到WGS84，可以使用以下代码示例：

import org.geotools.referencing.CRS;
import org.geotools.referencing.crs.DefaultGeographicCRS;
import org.geotools.referencing.operation.DefaultCoordinateOperationFactory;
import org.geotools.referencing.operation.MathTransform;

public class CGCS2000ToWGS84 {

    public static void main(String[] args) throws Exception {
        // Define WGS84 CRS
        String wgs84 = "EPSG:4326";
        // Define CGCS2000 CRS
        String cgcs2000 = "EPSG:4490";

        // Define CGCS2000 coordinates
        double x = 433067.03;
        double y = 4371345.63;

        // Create coordinate operation factory
        DefaultCoordinateOperationFactory factory = new DefaultCoordinateOperationFactory();

        // Create math transform from CGCS2000 to WGS84
        MathTransform transform = factory.createOperation(
                CRS.decode(cgcs2000),
                CRS.decode(wgs84),
                null).getMathTransform();

        // Transform CGCS2000 coordinates to WGS84
        double[] source = new double[]{x, y};
        double[] target = new double[2];
        transform.transform(source, 0, target, 0, 1);

        // Print WGS84 coordinates
        System.out.println("WGS84 coordinates: " + target[1] + ", " + target[0]);
    }
}

请注意，这些示例代码需要使用GeoTools库。您可以在https://docs.geotools.org/latest/userguide/library/referencing/install.html网站上找到有关如何安装GeoTools的更多信息。