平面坐标和经纬度坐标相互转换

/// <summary>/// 将经纬度点转换为平面坐标。/// </summary>/// <param name="map"></param>/// <param name="x"></param>/// <param name="y"></param>/// <returns></returns>public static IPoint GetProject(IMap map, double x, double y){try{IMap pMap = map;IPoint pt = new PointClass();ISpatialReferenceFactory pfactory = new SpatialReferenceEnvironmentClass();ISpatialReference flatref = pMap.SpatialReference;ISpatialReference earthref = pfactory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_Beijing1954);pt.PutCoords(x, y);IGeometry geo = (IGeometry)pt;geo.SpatialReference = earthref;geo.Project(flatref);return pt;}catch (Exception ex){throw new Exception(ex.Message);}}/// <summary>/// 将经纬度点转换为平面坐标点。/// </summary>/// <param name="map"></param>/// <param name="point"></param>/// <returns></returns>public static IPoint GetProject(IMap map, IPoint point){double x = point.X;double y = point.Y;try{IMap pMap = map;IPoint pt = new PointClass();ISpatialReferenceFactory pfactory = new SpatialReferenceEnvironmentClass();ISpatialReference flatref = pMap.SpatialReference;ISpatialReference earthref = pfactory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_Beijing1954);pt.PutCoords(x, y);IGeometry geo = (IGeometry)pt;geo.SpatialReference = earthref;geo.Project(flatref);return pt;}catch (Exception ex){throw new Exception(ex.Message);}}/// <summary>/// 将平面坐标转换为经纬度。/// </summary>/// <param name="map"></param>/// <param name="x"></param>/// <param name="y"></param>/// <returns></returns>public static IPoint GetGeo(IMap map, double x, double y){try{IMap pMap = map;IPoint pt = new PointClass();ISpatialReferenceFactory pfactory = new SpatialReferenceEnvironmentClass();ISpatialReference flatref = pMap.SpatialReference;ISpatialReference earthref = pfactory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_Beijing1954);pt.PutCoords(x, y);IGeometry geo = (IGeometry)pt;geo.SpatialReference = flatref;geo.Project(earthref);double xx = pt.X;return pt;}catch (Exception ex){throw new Exception(ex.Message);}}/// <summary>/// 将平面坐标点转换为经纬度点。/// </summary>/// <param name="map"></param>/// <param name="point"></param>/// <returns></returns>public static IPoint GetGeo(IMap map, IPoint point){double x = point.X;double y = point.Y;try{IMap pMap = map;IPoint pt = new PointClass();ISpatialReferenceFactory pfactory = new SpatialReferenceEnvironmentClass();ISpatialReference flatref = pMap.SpatialReference;ISpatialReference earthref = pfactory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_Beijing1954);pt.PutCoords(x, y);IGeometry geo = (IGeometry)pt;geo.SpatialReference = flatref;geo.Project(earthref);double xx = pt.X;return pt;}catch (Exception ex){throw new Exception(ex.Message);}}