GIS二次开发第4课介绍.ppt

private IProjectedCoordinateSystem LoadProjectedCoordinateSystem() { ISpatialReferenceFactory spatialReferenceFactory = new SpatialReferenceEnvironmentClass(); IProjectedCoordinateSystem projectedCoordinateSystem = spatialReferenceFactory.CreateESRISpatialReferenceFromPRJFile(C:\\Program Files\\ArcGIS\\Coordinate Systems\\Projected Coordinate Systems\\World\\Mollweide (world).prj) as IProjectedCoordinateSystem; return projectedCoordinateSystem; } private void CreateProjectedCoordinateSystem() { // SpatialReferenceEnvironment is a singleton object and needs to use the Activator class. Type t = Type.GetTypeFromProgID(esriGeometry.SpatialReferenceEnvironment); System.Object obj = Activator.CreateInstance(t); ISpatialReferenceFactory srFact = obj as ISpatialReferenceFactory; // Use the enumeration to create an instance of the predefined object. IProjectedCoordinateSystem projectedCS = srFact.CreateProjectedCoordinateSystem((int)esriSRProjCSType.esriSRProjCS_NAD1983UTM_11N); } Creating a predefined vertical coordinate system private static void GetVCSList() {ISpatialReferenceFactory3 srFact3 = new SpatialReferenceEnvironmentClass() as ISpatialReferenceFactory3; ISet vcsSet = srFact3.CreatePredefinedVerticalCoordinateSystems(); vcsSet.Reset(); IVerticalCoordinateSystem vcs; for (int i = 0; i vcsSet.Count; i++) { vcs = vcsSet.Next() as IVerticalCoordinateSystem; Console.WriteLine(VCS Name: {0} (Code: {1}), vcs.Name, vcs.FactoryCode); } } private void CreateVerticalReferenceSystem() { ISpatialReferenceFactory3 spatialReferenceFactory3 = new SpatialReferenceEnvironmentClass(); IVerticalCoordinateSystem verticalCoordinateSystem = spatialReferenceFactory3.CreateVerticalCoordinateSystem((int) esriSRVerticalCSType.esriSRVertCS_Alicante); } Creating a custom geographic coordinate system 地理坐标系包含坐标系的名称、角度单位、大地基准(datum，包含椭球体)及本初子午线(prime meridian)。通过IGeographicCoordinateSystem2接口提供的属性、方法可以访问、创建地理坐标系的相关对象。 尽管