ArcGis 获取地理、平面坐标系

 1 IProjectedCoordinateSystem LoadProjectedCoordinateSystem(string shpfile)
 2         {
 3             /*  IFeatureClass从中获取地理坐标、平面坐标
 4             string shpDir = System.IO.Path.GetDirectoryName(shpfile);
 5             string shpfilename = System.IO.Path.GetFileName(shpfile);
 6             IWorkspaceFactory wsFactory = new ShapefileWorkspaceFactoryClass();
 7             IWorkspace ws = wsFactory.OpenFromFile(shpDir, 0);
 8             IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)ws;
 9             IFeatureClass featureCls = featureWorkspace.OpenFeatureClass(shpfilename);
             IGeoDataset pGeoDataset = featureCls as IGeoDataset;
             var spatialReference = pGeoDataset.SpatialReference;
 
             IProjectedCoordinateSystem pProCoordSys = spatialReference as IProjectedCoordinateSystem;//平面
             IGeographicCoordinateSystem pGeographCoordinateSys = pProCoordSys.GeographicCoordinateSystem;//地理
             */
 
 
             //1、从文件中获取
             ESRI.ArcGIS.Geometry.ISpatialReferenceFactory spatialRefFactory = new ESRI.ArcGIS.Geometry.SpatialReferenceEnvironmentClass();
             ESRI.ArcGIS.Geometry.ISpatialReference spatialReference = spatialRefFactory.CreateESRISpatialReferenceFromPRJFile(shpfile.ToLower().Replace(".shp", ".prj"));
 
             //2、自定义
             IProjectedCoordinateSystem geographicCoordinateSystem = spatialRefFactory.CreateProjectedCoordinateSystem((int)ESRI.ArcGIS.Geometry.esriSRProjCSType.esriSRProjCS_World_Mercator);
 
             //3、从文件中获取
             Type factoryType = Type.GetTypeFromProgID("esriGeometry.SpatialReferenceEnvironment");
             System.Object obj = Activator.CreateInstance(factoryType);
             ISpatialReferenceFactory spatialReferenceFactory = obj as ISpatialReferenceFactory;
 
             IProjectedCoordinateSystem projectedCoordinateSystem = spatialReferenceFactory.CreateESRISpatialReferenceFromPRJFile(shpfile.ToLower().Replace(".shp", ".prj")) as IProjectedCoordinateSystem;
             return projectedCoordinateSystem;
 
         }