Arcgis---坐标转换API

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    /// <summary>    /// 坐标转换方法    /// </summary>    public class PointConvert    {        private static ISpatialReferenceFactory pSRF = null;        private static ISpatialReference pGCS = null;        private static ISpatialReference pPCS = null;        private static readonly object obj = new object();        private static readonly object syncPrj = new object();        private static readonly object syncGeo = new object();        private static PointConvert instance = null;        /// <summary>        /// 当前对象的实例        /// </summary>        public static PointConvert Instance        {            get            {                if (instance == null)                {                    lock (obj)                    {                        if (instance == null)                        {                            instance = new PointConvert();                            InitInfo();                        }                    }                }                return instance;            }        }        /// <summary>        /// 初始化常用的信息        /// </summary>        private static void InitInfo()        {            pSRF = new SpatialReferenceEnvironment();            pGCS = pSRF.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_WGS1984);            pPCS = pSRF.CreateProjectedCoordinateSystem((int)esriSRProjCSType.esriSRProjCS_WGS1984UTM_49N);            //            //(int)esriSRProjCSType.esriSRProjCS_Beijing1954GK_23N        }        /// <summary>        /// 将经纬度点转换为某投影下的坐标点        /// </summary>        /// <param name="pPoint">经纬度点</param>        /// <returns>某投影下的坐标点</returns>        /// <remarks>其中pPoint的X是经度，Y是纬度，单位都是度，千万不要搞错，否则转换出来的值是不对的或转换不出值</remarks>        public  IPoint GetProjectPoint(IPoint pPoint)        {            lock (syncPrj)            {                pPoint.SpatialReference = pGCS;                pPoint.Project(pPCS);            }            return pPoint;        }        ///<summary>        /// 将点转换为经纬度点        /// </summary>        /// <param name="pPoint">平面坐标点</param>        ///<returns>经纬度点</returns>        ///<remarks></remarks>        public IPoint GetGeoPoint(IPoint pPoint)        {            //IPoint pProPoint = new PointClass();            //pProPoint.PutCoords(pPoint.X, pPoint.Y);            lock (syncGeo)            {                pPoint.SpatialReference = pPCS;                pPoint.Project(pGCS);            }            return pPoint;        }    }
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