/// <summary> /// 地理座標系 轉 投影座標系 /// </summary> /// <param name="x"></param> /// <param name="y"></param> /// <param name="GCSType">地理座標系編號</param> /// <param name="PRJType">投影座標系編號</param> /// <returns></returns> private IPoint GCStoPRJ(double x, double y, int GCSType, int PRJType) { IPoint pPoint = new PointClass(); pPoint.PutCoords(x, y); ISpatialReferenceFactory pSRF = new SpatialReferenceEnvironmentClass(); pPoint.SpatialReference = pSRF.CreateGeographicCoordinateSystem(GCSType); //GCS_WGS_1984 WKID: 4326 權限: EPSG pPoint.Project(pSRF.CreateProjectedCoordinateSystem(PRJType)); //Xian_1980_3_Degree_GK_CM_114E WKID: 2383 權限: EPSG return pPoint; } /// <summary> /// 投影座標系 轉 地理座標系 /// </summary> /// <param name="x"></param> /// <param name="y"></param> /// <param name="GCSType">地理座標系編號</param> /// <param name="PRJType">投影座標系編號</param> /// <returns></returns> private IPoint PRJtoGCS(double x, double y,int GCSType, int PRJType) { IPoint pPoint = new PointClass(); pPoint.PutCoords(x, y); ISpatialReferenceFactory pSRF = new SpatialReferenceEnvironmentClass(); pPoint.SpatialReference = pSRF.CreateProjectedCoordinateSystem(PRJType); pPoint.Project(pSRF.CreateGeographicCoordinateSystem(GCSType)); return pPoint; }