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);
10 IGeoDataset pGeoDataset = featureCls as IGeoDataset;
11 var spatialReference = pGeoDataset.SpatialReference;
12
13 IProjectedCoordinateSystem pProCoordSys = spatialReference as IProjectedCoordinateSystem;//平面
14 IGeographicCoordinateSystem pGeographCoordinateSys = pProCoordSys.GeographicCoordinateSystem;//地理
15 */
16
17
18 // 1、从文件中获取
19 ESRI.ArcGIS.Geometry.ISpatialReferenceFactory spatialRefFactory = new ESRI.ArcGIS.Geometry.SpatialReferenceEnvironmentClass();
20 ESRI.ArcGIS.Geometry.ISpatialReference spatialReference = spatialRefFactory.CreateESRISpatialReferenceFromPRJFile(shpfile.ToLower().Replace( " .shp ", " .prj "));
21
22 // 2、自定义
23 IProjectedCoordinateSystem geographicCoordinateSystem = spatialRefFactory.CreateProjectedCoordinateSystem(( int)ESRI.ArcGIS.Geometry.esriSRProjCSType.esriSRProjCS_World_Mercator);
24
25 // 3、从文件中获取
26 Type factoryType = Type.GetTypeFromProgID( " esriGeometry.SpatialReferenceEnvironment ");
27 System.Object obj = Activator.CreateInstance(factoryType);
28 ISpatialReferenceFactory spatialReferenceFactory = obj as ISpatialReferenceFactory;
29
30 IProjectedCoordinateSystem projectedCoordinateSystem = spatialReferenceFactory.CreateESRISpatialReferenceFromPRJFile(shpfile.ToLower().Replace( " .shp ", " .prj ")) as IProjectedCoordinateSystem;
31 return projectedCoordinateSystem;
32
33 }

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