Question

Point2Ds pPoint2Ds = new Point2Ds(new Point2D() { X = 130.593, Y = 45.358 });
            Point2Ds clonePoint2Ds = pPoint2Ds.Clone();
            PrjCoordSys pcs = new PrjCoordSys();
            pcs.FromEPSGCode(4531);
            bool convertSucc = CoordSysTranslator.Forward(clonePoint2Ds, pcs);
            System.Diagnostics.Debug.Print(convertSucc.ToString());
            System.Diagnostics.Debug.Print(clonePoint2Ds[0].X + ":" + clonePoint2Ds[0].Y);
            System.Diagnostics.Debug.Print(pPoint2Ds[0].X + ":" + pPoint2Ds[0].Y);

            Point2Ds pPoint2Ds1 = new Point2Ds(new Point2D() { X = 43624818.2017499, Y = 5025965.55557387 });
            Point2Ds clonePoint2Ds1 = pPoint2Ds1.Clone();
            PrjCoordSys pcs1 = new PrjCoordSys();
            bool succ= pcs1.FromEPSGCode(4490);
            bool convertSucc1 = CoordSysTranslator.Inverse(clonePoint2Ds1, pcs1);
            System.Diagnostics.Debug.Print(convertSucc1.ToString());
            System.Diagnostics.Debug.Print(clonePoint2Ds1[0].X + ":" + clonePoint2Ds1[0].Y);
            System.Diagnostics.Debug.Print(pPoint2Ds1[0].X + ":" + pPoint2Ds1[0].Y);

请问下，我测试4490到4531的转换；发现，4490转4531没问题，但4531转4490，转换不成功；

以下是输出内容：

     True
43624818.2017499:5025965.55557387
130.593:45.358
False
43624818.2017499:5025965.55557387
43624818.2017499:5025965.55557387

还有，原数据，是不是需要给空间参考，又如何给呢，好像只有dataset有prjcoordsys这个属性，point2ds或georegion这种的，能设置空间参考？

Answer 1

用下面这个方法：

CoordSysTranslator.Convert 方法 (Point2Ds, PrjCoordSys, PrjCoordSys, CoordSysTransParameter, CoordSysTransMethod)

Comments

谢谢，上述这个方法可以；想问下，那Inverse，Forward用在哪种情况下；

还有，我试着将一个从数据集中获取的geometry，从4531转到4490，不管我是否用geometry.clone,他都直接修改了geometry的原值，有什么方法，能产生一个新的geometry吗？或者说，geometry.clone是一个浅拷贝，有没有深拷贝的方法，谢谢；（我错了，是深拷贝）