skyline坐标转换

1.使用skyline自带坐标转换，首先创建坐标系sgworld.CoordServices.CreateCoordinateSystem（WellKnownText）,fly本身坐标系sgworld.CoordServices.SourceCoordinateSystem（WellKnownText）,WellKnownText字符串格式可参考http://www.cnblogs.com/Dormouse/articles/1422984.html;也可以通过TPro查看，打开fly，按F8，选择地形数据集，地形坐标系里选择修改，即可搜索常见坐标系，下面会显示相应的WellKnownText。

2.使用skyline自带坐标转换API:sgworld.CoordServices.Reproject(原坐标系，新坐标系，X,Y);返回值为Coord2D对象，具体看帮助文档

3.以下是主要代码示例

//WGS84地理坐标系
function CreateCoord1() {
            return sgworld.CoordServices.CreateCoordinateSystem("GEOGCS['WGS84 Coordinate System',DATUM['WGS 1984',SPHEROID['WGS1984',6378137,298.257223563],TOWGS84[0,0,0,0,0,0,0],AUTHORITY['EPSG','6326']],PRIMEM['Greenwich',0],UNIT['degree',0.0174532925199433],AUTHORITY['EPSG','4326'],AUTHORITY['SBMG','LAT-LONG,LAT-LONG,WGS84,METERS']]");
        }
        //fly工程坐标系
        function CreateCoord2() {
            return sgworld.CoordServices.SourceCoordinateSystem;
        }
       //WGS84转原有坐标系
        function ConvertPos(x, y) {
            try {
                var fCoord = CreateCoord1();
                //alert(fCoord.WellKnownText);
                var tCoord = CreateCoord2();
                //alert(tCoord.WellKnownText);
                var Coord2D = sgworld.CoordServices.Reproject(fCoord, tCoord, x, y);
                return  Coord2D;
            }

            catch(e){
                alert(e);
            }
        }
         //原有坐标系转WGS84
        function ConvertPos1(x, y) {
            try {
                var fCoord = CreateCoord1();
                //alert(fCoord.WellKnownText);
                var tCoord = CreateCoord2();
                //alert(tCoord.WellKnownText);
                var Coord2D = sgworld.CoordServices.Reproject(tCoord, fCoord, x, y);
                return Coord2D;
            }

            catch(e) {
                alert(e);
            }
        }