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ArcGIS Engine生成等值线(C#)

时间:2016-03-10 14:21:19      阅读:208      评论:0      收藏:0      [点我收藏+]

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原文:ArcGIS Engine生成等值线(C#)

本文介绍c#写的利用ArcGIS Engine生成等值线的方法。

c#写的根据雨量站的降雨量值内插出降雨量等值线的功能。做几点说明:
根据离散点生成等值线:
(1)判断等值线shapefile图层临时存放路径是否存在,如果不存在则创建,如果存在并不为空则删除重建;
(2)加【降雨量】字段并赋值,生成等值线后删除所加字段;
(3)根据所选的字段利用IDW内插生成raster,再设定间距生成contour并标注。

---------------------------------以下是源代码----------------------------------

private void button1_Click(object sender, EventArgs e)
        {            
            //定义等值线临时shapefile图层存放路径
            string ls_TempSavePath = @"C:\HNYTTEMP" ;
            if (!Directory.Exists(ls_TempSavePath))//如果目录不存在,则创建
                Directory.CreateDirectory(ls_TempSavePath);
            DirectoryInfo di = new DirectoryInfo(ls_TempSavePath);
            FileInfo[] fi = null;
            fi = di.GetFiles();
            if (fi.Length != 0)//如果目录不为空,则删除目录,然后重建
            {
                Directory.Delete(ls_TempSavePath, true);
                Directory.CreateDirectory(ls_TempSavePath);
            }          
             IMap pMap  = axMapControl1.Map;  
             IInterpolationOp pInterpolationOp  = new RasterInterpolationOpClass();
  
             // Create the input point object
             IGeoDataset pInputDataset ;
             //雨量站图层【点】
             IFeatureLayer pFeatLayer = axMapControl1.get_Layer(0) as IFeatureLayer;
             // Calls function to open the point dataset from disk 
  
             IFeatureClass pFeatCla  = pFeatLayer.FeatureClass;  
            
             IFeature pFeature ;  
             IField pField  = new FieldClass();
             IFieldEdit pFieldEdit = pField as IFieldEdit;
  
             pFieldEdit .Name_2 = "降雨量";
             pFieldEdit.Type_2 = esriFieldType.esriFieldTypeDouble;
             pFieldEdit.Length_2 = 12;
             pFieldEdit.IsNullable_2 = false;
             pFieldEdit.DefaultValue_2 = 1111;
            pFeatCla.AddField(pFieldEdit);   //添加那个要用的字段进去
        for(int ii=0;ii<pFeatCla.FeatureCount(null) - 1;ii++)
            {
               pFeature = pFeatCla.GetFeature(ii);
               pFeature.set_Value(pFeature.Fields.FindField("降雨量"), 22+1999/(ii+2)); 
              //要素字段赋值,这里是自己随便赋的值,仅做测试用
          pFeature.Store();
            } 
           pInputDataset = pFeatLayer as IGeoDataset;
           // Define the search radius
           IRasterRadius pRadius  = new RasterRadiusClass();
           
           object Missing = Type.Missing;
           pRadius.SetVariable(12, ref Missing);  
           //Create FeatureClassDescriptor using a value field
          IFeatureClassDescriptor pFCDescriptor = new FeatureClassDescriptorClass();
          pFCDescriptor.Create( pFeatLayer.FeatureClass, null, "降雨量"); 
          //Set cellsize for output raster in the environment
          object cellSizeProvider = 20;
    
         IRasterAnalysisEnvironment pEnv  = pInterpolationOp as IRasterAnalysisEnvironment;
         pEnv.SetCellSize(esriRasterEnvSettingEnum.esriRasterEnvValue, ref  cellSizeProvider);
     
         //Perform the interpolation
         IRaster pOutRaster = pInterpolationOp.IDW(pFCDescriptor as IGeoDataset, 2, pRadius, ref Missing) as IRaster;
         
         //Add output into ArcMap as a raster layer    
         RasterLayer pOutRasLayer = new RasterLayerClass();
         pOutRasLayer.CreateFromRaster(pOutRaster);
         pOutRasLayer.Name = "栅格";
         //pMap.AddLayer(pOutRasLayer);
    
         IGeoDataset pGeoDataSet = pOutRaster as IGeoDataset;
         IWorkspaceFactory pWorkspaceFactory  = new ShapefileWorkspaceFactory();
         IWorkspace pShpWorkspace = pWorkspaceFactory.OpenFromFile(ls_TempSavePath, 0);
         ISurfaceOp2 pSurfaceOp2 = new RasterSurfaceOpClass();
         IRasterAnalysisEnvironment pRasterAnalysisEnvironment = pSurfaceOp2  as IRasterAnalysisEnvironment;
         pRasterAnalysisEnvironment.Reset();
         pRasterAnalysisEnvironment.SetCellSize(esriRasterEnvSettingEnum.esriRasterEnvValue, ref cellSizeProvider);
         pRasterAnalysisEnvironment.OutWorkspace = pShpWorkspace;
         double  dInterval   =5;  //间距 
         IGeoDataset pOutputDataSet   = pSurfaceOp2.Contour(pGeoDataSet, dInterval,ref Missing,ref Missing);
         IFeatureClass pFeatureClass=  pOutputDataSet as IFeatureClass;
         IFeatureLayer pFeatureLayer = new FeatureLayerClass();
         pFeatureLayer.FeatureClass = pFeatureClass;
         IGeoFeatureLayer pGeoFeatureLayer  = pFeatureLayer as IGeoFeatureLayer;
         pGeoFeatureLayer.DisplayAnnotation = true;
         pGeoFeatureLayer.DisplayField = "Contour";
         pGeoFeatureLayer.Name = "降雨量等值线";
         pMap.AddLayer( pGeoFeatureLayer);
         axMapControl1.Refresh();
        
         //删除【降雨量】字段
      IFields pFields = pFeatCla.Fields;
         int lFieldnumber = pFields.FindField("降雨量");
         IField pField1 = pFields.get_Field(lFieldnumber);
         pFeatCla.DeleteField(pField);
        }
acelee

ArcGIS Engine生成等值线(C#)

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原文地址:http://www.cnblogs.com/lonelyxmas/p/5261353.html

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