AE+c#要素类，地理坐标系和投影坐标系的设置（转载）

1.空坐标系

            ISpatialReferenceFactory spatialReferenceFactory = new SpatialReferenceEnvironmentClass();

            ISpatialReference spatialReference = new UnknownCoordinateSystemClass();
            ISpatialReferenceResolution spatialReferenceResolution = (ISpatialReferenceResolution)spatialReference;
            spatialReferenceResolution.ConstructFromHorizon();
            ISpatialReferenceTolerance spatialReferenceTolerance = (ISpatialReferenceTolerance)spatialReference;
            spatialReferenceTolerance.SetDefaultXYTolerance();

      2.地理坐标系

            ISpatialReferenceFactory spatialReferenceFactory = new SpatialReferenceEnvironmentClass();  

             esriSRGeoCS3Type geoSystem = esriSRGeoCS3Type.esriSRGeoCS_Xian1980;
            ISpatialReferenceResolution spatialReferenceResolution = spatialReferenceFactory.CreateGeographicCoordinateSystem(Convert.ToInt32(geoSystem)) as            ISpatialReferenceResolution;
            spatialReferenceResolution.ConstructFromHorizon();
            ISpatialReferenceTolerance spatialReferenceTolerance = spatialReferenceResolution as ISpatialReferenceTolerance;
            spatialReferenceTolerance.SetDefaultXYTolerance();
            ISpatialReference spatialReference = spatialReferenceResolution as ISpatialReference;

   3.投影坐标系

               ISpatialReferenceFactory spatialReferenceFactory = new SpatialReferenceEnvironmentClass();
            esriSRProjCS4Type proSystem = esriSRProjCS4Type.esriSRProjCS_Xian1980_3_Degree_GK_Zone_35;
            ISpatialReferenceResolution spatialReferenceResolution = spatialReferenceFactory.CreateProjectedCoordinateSystem(Convert.ToInt32(proSystem)) as         ISpatialReferenceResolution;
            spatialReferenceResolution.ConstructFromHorizon();
            ISpatialReferenceTolerance spatialReferenceTolerance = spatialReferenceResolution as ISpatialReferenceTolerance;
            spatialReferenceTolerance.SetDefaultXYTolerance();
            ISpatialReference spatialReference = spatialReferenceResolution as ISpatialReference;

 

 

                IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;
                IGeoDataset pGeoDataset = pFeatureClass as IGeoDataset;
                ISpatialReference  m_spatialReference = pGeoDataset.SpatialReference;

 

转自：http://blog.csdn.net/u011116642/article/details/17731979