克里金插值

由于用SuperMap Objects 没有解决插值范围的问题（见本版帖子“求助！哪位大侠在用SuperMap Objects，请教一个插值区域的问题”），改用ArcGIS Engine来做，现在遇到同样的问题。使用IInterpolationOp的krige方法已经实现了插值，但范围局限于气象站点的外框范围，查遍帮助，知到可以通过IRasterAnalysisEnvironment的SetExtent进行设置，下面是我写C＃代码，如果使用克里金，但一旦添加了pEnv.SetExtent(esriRasterEnvSettingEnum.esriRasterEnvValue, ref extentProvider, ref snapRasterData);这句便会出现错误unable to estimate the Semi-Variogram ,同样的设置在用反距离IDW插值中没有问题。刚刚接触ArcGIS Engine，想必气象部门也有在用ArcGIS Engine的同仁吧，请帮忙看看，到底哪里出了问题，谢谢！
    顺便说一句，最近收集了许多SuperMap Objects 和SuperMap Objects以及地理信息方面的资料，包括电子书、示例代码等，愿意和大家共享，更期望和大家交流。QQ：93313198，Email:ybfuqiang@sina.com.

       private void Mlayer_Krige_Click(object sender, EventArgs e)
        {
            // 用克里金Krige插值生成的栅格图像。如下：
            IWorkspaceFactory pWorkspaceFactory = new ShapefileWorkspaceFactory();
            string pPath = Application.StartupPath + @"\data\ybdata_point_point.shp";
            string pFolder = System.IO.Path.GetDirectoryName(pPath);
            string pFileName = System.IO.Path.GetFileName(pPath);
            IWorkspace pWorkspace = pWorkspaceFactory.OpenFromFile(pFolder, 0);
            IFeatureWorkspace pFeatureWorkspace = pWorkspace as IFeatureWorkspace;
            IFeatureClass oFeatureClass = pFeatureWorkspace.OpenFeatureClass(pFileName);
            IFeatureClassDescriptor pFCDescriptor = new FeatureClassDescriptorClass();
            pFCDescriptor.Create(oFeatureClass, null, "value");

            IInterpolationOp pInterpolationOp = new RasterInterpolationOpClass();
            IRasterAnalysisEnvironment pEnv = pInterpolationOp as IRasterAnalysisEnvironment;

            object Cellsize = 0.004;//Cell size for output raster;
            pEnv.SetCellSize(esriRasterEnvSettingEnum.esriRasterEnvValue, ref Cellsize);
            //设置输出范围

      object snapRasterData = Type.Missing;
            IEnvelope pExtent;
            pExtent = new EnvelopeClass();
            Double xmin = 103.60;
            Double xmax = 105.36;

            Double ymin = 27.84;
            Double ymax = 29.27;
            pExtent.PutCoords(xmin, ymin, xmax, ymax);
            object extentProvider = pExtent;
            //pEnv.SetExtent(esriRasterEnvSettingEnum.esriRasterEnvValue, ref extentProvider, ref snapRasterData);
            Double dSearchD = 10;
            object pSearchCount = 3;
            object missing = Type.Missing; 
            IRasterRadius pRadius= new RasterRadius();
            pRadius.SetFixed(dSearchD , ref pSearchCount);
           //pRadius.SetVariable((int)pSearchCount, ref dSearchD);

            IGeoDataset poutGeoDataset = pInterpolationOp.Krige((IGeoDataset)pFCDescriptor, esriGeoAnalysisSemiVariogramEnum.esriGeoAnalysisGaussianSemiVariogram, pRadius, false, ref missing);
          
            IRaster pOutRaster = poutGeoDataset as IRaster;
            IRasterLayer pOutRasLayer = new RasterLayer();
            pOutRasLayer.CreateFromRaster(pOutRaster);
            IMap pMap = Frmmain.Fmap.axMapControl1.Map;
            pMap.AddLayer(pOutRasLayer);
            Frmmain.Fmap.axTOCControl1.Refresh();
            Frmmain.Fmap.axMapControl1.ActiveView.Refresh();

        }

        private void Mlayer_IDW_Click(object sender, EventArgs e)
        {
            // 用反距离IDW插值生成的栅格图像。如下：
      IInterpolationOp pInterpolationOp = new RasterInterpolationOpClass();

            IWorkspaceFactory pWorkspaceFactory = new ShapefileWorkspaceFactory();
            string pPath = Application.StartupPath + @"\data\ybdata_point_point.shp";
            string pFolder = System.IO.Path.GetDirectoryName(pPath);
            string pFileName = System.IO.Path.GetFileName(pPath);

            IWorkspace pWorkspace = pWorkspaceFactory.OpenFromFile(pFolder, 0);

            IFeatureWorkspace pFeatureWorkspace = pWorkspace as IFeatureWorkspace;
            IFeatureClass oFeatureClass = pFeatureWorkspace.OpenFeatureClass(pFileName);
            IFeatureClassDescriptor pFCDescriptor = new FeatureClassDescriptorClass();
            pFCDescriptor.Create(oFeatureClass, null, "value");
            IRasterRadius pRadius = new RasterRadiusClass();

            object objectMaxDistance = null;
            object objectbarrier = null;
            object missing = Type.Missing;
            pRadius.SetVariable(12, ref objectMaxDistance);

            object dCellSize = 0.013;
            object snapRasterData = Type.Missing;
            IEnvelope pExtent;
            pExtent = new EnvelopeClass();
            Double xmin = 103.60;
            Double xmax = 105.36; 
            Double ymin = 29.27;
            Double ymax = 27.84;
            pExtent.PutCoords(xmin, ymin, xmax, ymax);
            object extentProvider = pExtent;
            IRasterAnalysisEnvironment pEnv = pInterpolationOp as IRasterAnalysisEnvironment;
            pEnv.SetCellSize(esriRasterEnvSettingEnum.esriRasterEnvValue, ref dCellSize);
            pEnv.SetExtent(esriRasterEnvSettingEnum.esriRasterEnvValue, ref extentProvider, ref snapRasterData);
            IGeoDataset poutGeoDataset = pInterpolationOp.IDW((IGeoDataset)pFCDescriptor, 2, pRadius, ref objectbarrier);
            ISurfaceOp surOp = new RasterSurfaceOpClass();


            IRaster pOutRaster = poutGeoDataset as IRaster;

            IRasterLayer pOutRasLayer = new RasterLayer();
            pOutRasLayer.CreateFromRaster(pOutRaster);
            IMap pMap = Frmmain.Fmap.axMapControl1.Map;
            pMap.AddLayer(pOutRasLayer);
            Frmmain.Fmap.axTOCControl1.Refresh();
            Frmmain.Fmap.axMapControl1.ActiveView.Refresh();


        }