java - GeoTools:如何从 GeodeticDatum 实例获取 Bursa-Wolf 参数

Question

我有一个 GeodeticDatum 类型的实例。我可以使用方法 datum.getEllipsoid() 和 getName()、getInverseFlattening() 等获取椭球体名称、展平、轴。

如何在不将数据转换为 WKT 字符串并手动解析的情况下获取 Bursa-Wolf 参数 (towgs84)？

DATUM["New Zealand Geodetic Datum 1949", 
  SPHEROID["International 1924", 6378388.0, 297.0], 
  TOWGS84[59.47, -5.04, 187.44, 0.47, -0.1, 1.024, -4.5993]]

Answer 1

ProjectedCRS crsFromWkt = (ProjectedCRS) CRS.parseWKT(/*OGC WKT of your projected coordinate system*/):
DefaultGeodeticDatum defaultGeodeticDatum = new DefaultGeodeticDatum(crsFromWkt.getDatum());
        System.out.println(defaultGeodeticDatum.getBursaWolfParameters()[0].dx);
        System.out.println(defaultGeodeticDatum.getBursaWolfParameters()[0].dy);
        System.out.println(defaultGeodeticDatum.getBursaWolfParameters()[0].dz);
        System.out.println(defaultGeodeticDatum.getBursaWolfParameters()[0].ex);
        System.out.println(defaultGeodeticDatum.getBursaWolfParameters()[0].ey);
        System.out.println(defaultGeodeticDatum.getBursaWolfParameters()[0].ez);
        System.out.println(defaultGeodeticDatum.getBursaWolfParameters()[0].ppm);