[AE] ArcGIS Engine与栅格Raster合集

红太狼 2021-12-11 18:21 533阅读 0赞

### 文章目录 ###

*  栅格数据
 *  遍历栅格
 *  显示栅格至窗口中、唯一值渲染后显示
 *  Tools文件：打开、保存栅格，获取栅格数据的二维矩阵，由二维矩阵生成栅格
 *   *  例子：获取栅格数据的二维矩阵，并修改，修改完之后应用到IGeoDataset中
 *  未测试
 *   *  打开栅格数据
     *   *  IRasterLayer
         *  IRasterDataset
     *  读取属性和遍历
     *  保存
     *  栅格计算器
     *   *  两个图层计算后返回图层
         *  多个文件参与计算
         *  单个栅格文件中多个波段参与计算
     *  案例
     *   *  ArcGIS的Nodata转成ERDAS
         *  提取指定范围的栅格数据
         *  栅格数据重采样
         *  TIN转Raster

# 栅格数据 #

【类型】

*  ESRI GRID：一系列的文件组成
 *  TIFF：TIF文件+AUX文件
 *  ERDAS IMAGE：

【栅格数据集】由一个或多个波段组成，一个波段就是数据矩阵

*  格网数据（如DEM数据）、单波段的影像数据：只含有一个波段
 *  多光谱影像数据：多波段的栅格数据集

【接口介绍】

*  IRasterWorkspaceEx：主要用来读取GeoDatabase中的栅格数据
 *  IRasterWorkspace、IRasterWorpsace2：读取文件格式的栅格数据

# 遍历栅格 #

IRasterLayer pDEMRLayer = axMapControl1.get_Layer(1) as IRasterLayer;
    IRaster pDEMR = pDEMRLayer.Raster;
    IRasterProps pRasterProps = (IRasterProps)(pDEMRLayer.Raster);
    //存储每个栅格的X坐标和Y坐标
    double blockX = pRasterProps.MeanCellSize().X;
    double blockY = pRasterProps.MeanCellSize().Y;
    //栅格数据左上角栅格的空间坐标
    double Xm = pRasterProps.Extent.XMin + blockX / 2;
    double Ym = pRasterProps.Extent.YMin + blockX / 2;
    int dHeight = pRasterProps.Height;//当前栅格数据集的行数
    int dWidth = pRasterProps.Width; //当前栅格数据集的列数
    IPnt pnt = new PntClass();
     //读取栅格信息
    pnt.SetCoords(0, 0);//0，0取值窗口的起始位置在原栅格数据上的位置
    IPnt pntSize = new PntClass();
    pntSize.SetCoords(dWidth, dHeight);//设置取值窗口的行列，注意这里是先列后行
    IPixelBlock pixelBlock = pDEMR.CreatePixelBlock(pntSize);//生成像素块
    pDEMR.Read(pnt, pixelBlock);
    List<IPoint> depthList = new List<IPoint>(); 
    for (int i = 0; i < dHeight; i++)
         for (int j = 0; j < dWidth; j++)
         { 
             object obj = Convert.ToDouble(pixelBlock.GetVal(0, i, j));
         }

# 显示栅格至窗口中、唯一值渲染后显示 #

【位置】MainForm的静态方法

public static AxMapControl globalMapControl = null; //存放axMapControl，作为全局变量
    
    // 在MainForm加载函数中添加最后一句
    private void MainForm_Load(object sender, EventArgs e)
    { 
        //get the MapControl
        m_mapControl = (IMapControl3)axMapControl1.Object;
    
        //disable the Save menu (since there is no document yet)
        menuSaveDoc.Enabled = false;
    
    	// 【添加此句】
        MainForm.globalMapControl = this.axMapControl1;
    }
    
    // 显示IGeoDataset至窗口中
    public static void ShowRaster(IGeoDataset pGeo, string name)
    { 
        IRasterBandCollection irbc = (IRasterBandCollection)pGeo;
        IRasterDataset pRD = irbc.Item(0).RasterDataset;
        IRasterLayer rasterLayer = new RasterLayerClass();
        rasterLayer.CreateFromDataset(pRD);
        rasterLayer.Name = name;
        MainForm.globalMapControl.AddLayer(rasterLayer);
        MainForm.globalMapControl.ActiveView.Refresh();
    }
    
    public static void ShowRasterByUniqueValueRender(IGeoDataset pGeo, string name, string renderfiled = "Value")
    { 
        try
        { 
            IRasterBandCollection irbc = (IRasterBandCollection)pGeo;
            IRasterDataset pRD = irbc.Item(0).RasterDataset;
            IRasterLayer rasterLayer = new RasterLayerClass();
            rasterLayer.CreateFromDataset(pRD);
            rasterLayer.Name = name;
            IRasterUniqueValueRenderer uniqueValueRenderer = new RasterUniqueValueRendererClass();
            IRasterRenderer pRasterRenderer = uniqueValueRenderer as IRasterRenderer;
            pRasterRenderer.Raster = rasterLayer.Raster;
            pRasterRenderer.Update();
            IUniqueValues uniqueValues = new UniqueValuesClass();
            IRasterCalcUniqueValues calcUniqueValues = new RasterCalcUniqueValuesClass();
            calcUniqueValues.AddFromRaster(rasterLayer.Raster, 0, uniqueValues);//iBand=0 
            IRasterRendererUniqueValues renderUniqueValues = uniqueValueRenderer as IRasterRendererUniqueValues;
            renderUniqueValues.UniqueValues = uniqueValues;
            uniqueValueRenderer.Field = renderfiled;
            // 色带
            IAlgorithmicColorRamp colorRamp = new AlgorithmicColorRampClass();
                // 头
            IRgbColor pFromColor = new RgbColorClass();
            pFromColor.Red = 255; //红色
            pFromColor.Green = 0;
            pFromColor.Blue = 0;
                // 尾
            IRgbColor pToColor = new RgbColorClass();
            pToColor.Red = 0; // 绿色
            pToColor.Green = 255;
            pToColor.Blue = 0;
                // 设置属性
            colorRamp.FromColor = pFromColor;
            colorRamp.ToColor = pToColor;
            colorRamp.Size = uniqueValues.Count;
    
            uniqueValueRenderer.HeadingCount = 1;
            uniqueValueRenderer.set_Heading(0, "All Data Value");
            uniqueValueRenderer.set_ClassCount(0, uniqueValues.Count);
            bool pOk;
            colorRamp.CreateRamp(out pOk);
            IRasterRendererColorRamp pRasterRendererColorRamp = uniqueValueRenderer as IRasterRendererColorRamp;
            pRasterRendererColorRamp.ColorRamp = colorRamp;
            for (int i = 0; i < uniqueValues.Count; i++)
            { 
                uniqueValueRenderer.AddValue(0, i, uniqueValues.get_UniqueValue(i));
                uniqueValueRenderer.set_Label(0, i, uniqueValues.get_UniqueValue(i).ToString());
                IFillSymbol fs = new SimpleFillSymbol();
                fs.Color = colorRamp.get_Color(i);
                uniqueValueRenderer.set_Symbol(0, i, fs as ISymbol);
            }
            pRasterRenderer.Update();
            rasterLayer.Renderer = pRasterRenderer;
            MainForm.globalMapControl.AddLayer(rasterLayer);
            MainForm.globalMapControl.ActiveView.Refresh();
        }
        catch (Exception ex)
        { 
            MessageBox.Show(ex.Message);
        }
    }

# Tools文件：打开、保存栅格，获取栅格数据的二维矩阵，由二维矩阵生成栅格 #

【Tools文件】AE栅格文件的操作

*  删除栅格文件
 *  打开栅格文件
 *  保存栅格文件
 *  栅格计算器
 *  获取栅格数据中的二维矩阵，得到System.Array类型（二维数组）
 *  根据System.Array二维矩阵（二维数组）修改栅格文件

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.IO;
    using ESRI.ArcGIS.Geodatabase;
    using ESRI.ArcGIS.DataSourcesRaster;
    using ESRI.ArcGIS.SpatialAnalyst;
    
    namespace PM25Application
    { 
        class Tools
        { 
    
            #region 栅格文件基本操作
            /// <summary>
            /// 删除栅格数据fp
            /// </summary>
            /// <param name="fp">路径</param>
            public static bool DeleteRasterFile(string fp)
            { 
                try
                { 
                    string fn = Path.GetFileNameWithoutExtension(fp);
                    var files = Directory.GetFiles(Path.GetDirectoryName(fp), fn + ".*");
                    if (files.Length < 0)
                        return true;
                    for (int i = 0; i < files.Length; i++)
                    { 
                        File.Delete(files[i]); //删除文件
                    }
                }
                catch (Exception e) { 
                    return false; //异常
                }
                return true;
            }
    
    
            /// <summary>
            /// 打开栅格_tif格式
            /// </summary>
            /// <param name="fp">栅格路径</param>
            /// <returns>IGeoDataset</returns>
            public static IGeoDataset OpenRaster(string fp)
            { 
                IWorkspaceFactory wf = new RasterWorkspaceFactoryClass();
                IWorkspace ws = wf.OpenFromFile(Path.GetDirectoryName(fp), 0);
                IRasterWorkspace2 rw = ws as IRasterWorkspace2;
                IRasterDataset rd = rw.OpenRasterDataset(Path.GetFileName(fp));
                IGeoDataset pGeo = rd as IGeoDataset;
                MainForm.ShowRaster(pGeo, Path.GetFileName(fp));
                return pGeo;
            }
    
            /// <summary>
            /// 保存栅格_tif格式
            /// </summary>
            /// <param name="pGeo"></param>
            /// <param name="out_fp"></param>
            /// <returns></returns>
            public static bool SaveRaster(IGeoDataset pGeo, string out_fp)
            { 
                // out_fp是否存在，存在的话删除其文件
                if (File.Exists(out_fp) == true)
                { 
                    bool ok = DeleteRasterFile(out_fp);
                    if (ok == false) {  //删除文件失败
                        return false;
                    }
                }
                // 将矩阵GeoDataset转成栅格集
                IRasterBandCollection irbc = (IRasterBandCollection)pGeo;
                IRasterDataset pRD = irbc.Item(0).RasterDataset;
                // 保存
                IWorkspaceFactory workspaceFactoryOut = new RasterWorkspaceFactoryClass();
                IWorkspace workspace1 = workspaceFactoryOut.OpenFromFile(Path.GetDirectoryName(out_fp), 0);
                irbc.SaveAs(Path.GetFileName(out_fp), workspace1, "TIFF");
    
                MainForm.ShowRaster(pGeo, Path.GetFileName(out_fp));
                return true;
            }
    
            public static bool SaveRaster(IRasterBandCollection pRBC, string out_fp)
            { 
                // 保存
                IWorkspaceFactory workspaceFactoryOut = new RasterWorkspaceFactoryClass();
                IWorkspace workspace1 = workspaceFactoryOut.OpenFromFile(Path.GetDirectoryName(out_fp), 0);
                pRBC.SaveAs(Path.GetFileName(out_fp), workspace1, "TIFF");
                return true;
            }
    
            /// <summary>
            /// 两个IGeoDataset相减，并取绝对值
            /// </summary>
            /// <param name="pGeo1"></param>
            /// <param name="pGeo2"></param>
            /// <returns></returns>
            public static IGeoDataset SubAndAbs(IGeoDataset pGeo1, IGeoDataset pGeo2)
            { 
                IMapAlgebraOp pMapAlgebraOp = new RasterMapAlgebraOpClass();
                pMapAlgebraOp.BindRaster(pGeo1, "pGeo1");
                pMapAlgebraOp.BindRaster(pGeo2, "pGeo2");
                string formula = string.Concat("Abs( [pGeo1] - [pGeo2] )");
                formula = string.Concat("Con( [pGeo1] == 0 | [pGeo2] == 0, 0, ", formula, " )");
                IGeoDataset result = pMapAlgebraOp.Execute(formula);
                return result;
            }
    
            /// <summary>
            /// 栅格文件转数组
            /// </summary>
            /// <param name="raster"></param>
            /// <param name="novalue"></param>
            /// <returns></returns>
            public static System.Array RasterToArray(IGeoDataset pGD, ref object novalue)
            { 
                IRaster raster = pGD as IRaster;
                IRasterProps props = (IRasterProps)raster;
                novalue = props.NoDataValue;
                IPnt pBlockSize = new PntClass();
                pBlockSize.SetCoords((double)props.Width, (double)props.Height);
                IRaster2 raster2 = (IRaster2)raster;
                IPixelBlock pixelBlock = raster2.CreateCursorEx(pBlockSize).PixelBlock;
                pBlockSize.SetCoords(0.0, 0.0);
                raster.Read(pBlockSize, pixelBlock);
                IPixelBlock3 block3 = (IPixelBlock3)pixelBlock;
                return (System.Array)block3.get_PixelData(0);
            }
    
            public static IGeoDataset AlterRasterArray(IGeoDataset pGeo, Array arr)
            { 
                IRaster raster = pGeo as IRaster;
                IRasterProps props = (IRasterProps)raster;
                IPnt pBlockSize = new PntClass();
                pBlockSize.SetCoords((double)props.Width, (double)props.Height);
                IRaster2 raster2 = (IRaster2)raster;
                IPixelBlock pixelBlock = raster2.CreateCursorEx(pBlockSize).PixelBlock;
                pBlockSize.SetCoords(0.0, 0.0);
                raster.Read(pBlockSize, pixelBlock);
                pixelBlock.set_SafeArray(0, arr);
    
                //编辑raster，将更新的值写入raster中 
                IRasterEdit rasterEdit = raster as IRasterEdit;
                //左上点坐标 
                IPnt tlp = new Pnt();
                tlp.SetCoords(0, 0);
                rasterEdit.Write(tlp, pixelBlock);
                rasterEdit.Refresh();
                return pGeo;
            }
            #endregion
        }
    }

## 例子：获取栅格数据的二维矩阵，并修改，修改完之后应用到IGeoDataset中 ##

object novalues = 0; //Nodata的值，返回的是float[]类型
    arr =  Tools.RasterToArray(value_blue, ref novalues);
    
    // 获得novalue值：novalues为<float[]>类型
    float[] tmp = (float[])novalues;
    float novalue = tmp[0];
    
    // 遍历arr
    for (int i = 0; i < arr.GetLength(0); i++) //arr.GetLength(i)：得到第i维的长度
    { 
        for (int j = 0; j < arr.GetLength(1); j++)
        { 
            // 这一点的像素值
            float pixelvalue = (float)arr.GetValue(i, j);
            // 设置新的值
            flaot aod_value = 1;
            arr.SetValue(aod_value, i, j);
        }
    }
    
    // 让二维数组arr生成栅格数据（使用传入的IGeoDataset作为模板）
    IGeoDataset pGeo = Tools.OpenRaster(fp); //打开一个栅格文件，作为模板
    aod = Tools.AlterRasterArray(pGeo , arr); //修改pGeo中的矩阵数组

# 未测试 #

[栅格的渲染方式][Link 1]

## 打开栅格数据 ##

### IRasterLayer ###

IRasterLayer rasterLayer = new RasterLayerClass();
    rasterLayer.CreateFromFilePath(fileName); // fileName指存本地的栅格文件路径
    axMapControl1.AddLayer(rasterLayer, 0);   // 添加到MapControl中

### IRasterDataset ###

【举例】获取指定波段

raster_dir = "F:\PM2.5\data\LC08_L1TP_119043_20161218_20170315_01_T1"
    raster_name = "LC08_L1TP_119043_20161218_20170315_01_T1_B1.TIF"
    //创建一个【栅格工作空间的工厂】IWorkspaceFactory
    IWorkspaceFactory workspaceFactory = new RasterWorkspaceFactory();
    //打开栅格的工作空间IRasterWorkspace（即栅格数据所在的文件夹）
    IWorkspace workspace = workspaceFactory.OpenFromFile(raster_dir, 0);
    IRasterWorkspace2 rasterWordspace = workspace as IRasterWorkspace2; // 获得IRasterWorkspace2接口
    //打开栅格工作空间中的指定栅格数据集IRasterDataset（即指定栅格的文件名）
    IRasterDataset rastDataset = rasterWordspace.OpenRasterDataset(raster_name); 
    IRasterDataset2 rd2 = rastDataset as IRasterDataset2;  // 获得IRasterDataset2接口
    //创建IRaster
    IRaster raster = rd2.CreateFullRaster();
    IRasterBandCollection rbc = (IRasterBandCollection)raster;	//获得该栅格的所有波段
    // 获得指定波段
    IGeoDataset pGoe1 = rbc.Item(0) as IGeoDataset;

## 读取属性和遍历 ##

// 假设当前加载的栅格文件栅格值存储方式为：UShort类型
    IRasterProps rasterProps = (IRasterProps)clipRaster;
    int dHeight = rasterProps.Height;//当前栅格数据集的行数
    int dWidth = rasterProps.Width; //当前栅格数据集的列数
    double dX = rasterProps.MeanCellSize().X; //栅格的宽度
    double dY = rasterProps.MeanCellSize().Y; //栅格的高度
    IEnvelope extent=rasterProps.Extent; //当前栅格数据集的范围
    rstPixelType pixelType=rasterProps.PixelType; //当前栅格像素类型
    // 遍历
    IPnt pntSize = new PntClass();
    pntSize.SetCoords(dX, dY);
    IPixelBlock pixelBlock = clipRaster.CreatePixelBlock(pntSize);
    IPnt pnt = new PntClass();
    for (int i = 0; i < dHeight; i++)
    	for (int j = 0; j < dWidth; j++)
    	{
    		pnt.SetCoords(i, j);
    		clipRaster.Read(pnt, pixelBlock);
    		if (pixelBlock != null)
    		{
    			object obj = pixelBlock.GetVal(0, 0, 0);
    			MessageBox.Show( Convert.ToUInt32(obj).ToString());
    		}
    	}

## 保存 ##

IGeoDataset outGeoDataset; //处理所得的最终结果
    // 保存
    IWorkspaceFactory workspaceFactoryOut = new RasterWorkspaceFactory();
    IWorkspace workspace1 = workspaceFactoryOut.OpenFromFile(System.IO.Path.GetDirectoryName(out_fp), 0);    
    IRasterBandCollection irbc = outGeoDataset as IRasterBandCollection;
    irbc.SaveAs("out.tif", workspace1, "TIFF");
    IRasterDataset pRD = irbc.Item(0).RasterDataset;
    // 显示到MapControl
    IRasterLayer pOutRL = new RasterLayerClass();
    pOutRL.CreateFromDataset(pRD);
    pOutRL.Name = System.IO.Path.GetFileName(out_fp);
    axMapControl1.AddLayer(pOutRL);

## 栅格计算器 ##

### 两个图层计算后返回图层 ###

public static IRasterLayer rasterCalculate(IRasterLayer pRL1, IRasterLayer pRL2)
    {
    	IRaster pR1 = pRL1.Raster;
    	IRaster pR2 = pRL2.Raster;
    
    	IGeoDataset pGeoDT1 = pR1 as IGeoDataset;
    	IGeoDataset pGeoDT2 = pR2 as IGeoDataset;
    
    	IMapAlgebraOp pRSalgebra = new RasterMapAlgebraOpClass();
    	pRSalgebra.BindRaster(pGeoDT1, "raster1");
    	pRSalgebra.BindRaster(pGeoDT2, "raster2");
    	IGeoDataset pOutGeoDT = pRSalgebra.Execute("[raster1] - [raster2]");
    
    	IRasterLayer pOutRL = new RasterLayerClass();
    	pOutRL.CreateFromRaster(pOutGeoDT, as IRaster);
    	return pOutRL;
    }

### 多个文件参与计算 ###

string name1 = "band1";
    string fp1 = @"\\vmware-host\Shared Folders\PM2.5\data\LC08_L1TP_119043_20161218_20170315_01_T1\LC08_L1TP_119043_20161218_20170315_01_T1_B1.TIF";
    string name2 = "band2";
    string fp2 = @"\\vmware-host\Shared Folders\PM2.5\data\LC08_L1TP_119043_20161218_20170315_01_T1\LC08_L1TP_119043_20161218_20170315_01_T1_B2.TIF";
    string formula = "[band1] - [band2]";
    string out_fp = @"\\vmware-host\Shared Folders\PM2.5\data\sum.tif";
    // open1
    IWorkspaceFactory wF1 = new RasterWorkspaceFactory();
    IWorkspace ws1 = wF1.OpenFromFile(Path.GetDirectoryName(fp1), 0);
    IRasterWorkspace2 rw1 = ws1 as IRasterWorkspace2;
    IRasterDataset rD1 = rw1.OpenRasterDataset(Path.GetFileName(fp1));
    IGeoDataset pGeo1 = rD1 as IGeoDataset;
    // open2
    IWorkspaceFactory wF2 = new RasterWorkspaceFactory();
    IWorkspace ws2 = wF2.OpenFromFile(Path.GetDirectoryName(fp2), 0);
    IRasterWorkspace2 rw2 = ws2 as IRasterWorkspace2;
    IRasterDataset rD2 = rw2.OpenRasterDataset(Path.GetFileName(fp2));
    IGeoDataset pGeo2 = rD2 as IGeoDataset;
    // 栅格计算器
    IMapAlgebraOp pRSalgebra = new RasterMapAlgebraOpClass();
    // 设置变量
    pRSalgebra.BindRaster(pGeo1, name1);
    pRSalgebra.BindRaster(pGeo2, name2);
    // 执行
    IGeoDataset pOutGeo = pRSalgebra.Execute(formula);
    
    // 将矩阵GeoDataset转成栅格集
    IRasterBandCollection irbc = (IRasterBandCollection)pOutGeo;
    IRasterDataset pRD = irbc.Item(0).RasterDataset;
    // 保存
    IWorkspaceFactory workspaceFactoryOut = new RasterWorkspaceFactory();
    IWorkspace workspace1 = workspaceFactoryOut.OpenFromFile(Path.GetDirectoryName(out_fp), 0);
    irbc.SaveAs(Path.GetFileName(out_fp), workspace1, "TIFF");

### 单个栅格文件中多个波段参与计算 ###

1.  打开栅格
2.  获得该栅格的波段集
3.  从波段集中获取两个矩阵
4.  用两个矩阵进行计算

// 打开栅格
    IWorkspaceFactory workspaceFactory = new RasterWorkspaceFactory();
    IWorkspace workspace = workspaceFactory.OpenFromFile(pathFile, 0);
    IRasterWorkspace2 rasterWordspace = workspace as IRasterWorkspace2;
    IRasterDataset rastDataset = rasterWordspace.OpenRasterDataset(inName);
    IRasterDataset2 rd2 = rastDataset as IRasterDataset2;
    IRaster raster = rd2.CreateFullRaster();
    IRasterBandCollection rbc = (IRasterBandCollection)raster; //获取矩阵集
    
    
    // 栅格计算器
    IMapAlgebraOp pRSalgebra = new RasterMapAlgebraOpClass();
    // 从波段集中获取单个波段，即该波段的矩阵GeoDataSet（Item的下标从0开始）
    IGeoDataset pGoe1 = rbc.Item(index1) as IGeoDataset;
    IGeoDataset pGoe2 = rbc.Item(index2) as IGeoDataset;
    // 设置变量
    pRSalgebra.BindRaster(pGoe1, "raster1");
    pRSalgebra.BindRaster(pGoe2, "raster2");
    // 计算公式，其中变量用[]来引用
    L = numericUpDown_L.Value;
    String strOut = "([raster2] - [raster1])" + " * " + "(1 + " + L + ")" + " / " + "(([raster1] + [raster2]" + " + " + L + ")" + " * " + "1.00)";
    // 执行
    IGeoDataset pOutGeo = pRSalgebra.Execute(strOut);
    
    IGeoDataset pGeo1 = ProNoDataRaster(pOutGeo);
    // 将矩阵GeoDataset转成栅格集
    IRasterBandCollection irbc = (IRasterBandCollection)pGeo1;
    IRasterDataset pRD = irbc.Item(0).RasterDataset;
    rastDataset_savi = pRD;
    //保存文件前检查是否有文件占用
    string savi = "savi.tif";
    IWorkspaceFactory workspaceFactoryOut = new RasterWorkspaceFactory();
    IWorkspace workspace1 = workspaceFactoryOut.OpenFromFile(out_dir, 0);
    irbc.SaveAs(savi, workspace1, "TIFF");

## 案例 ##

### ArcGIS的Nodata转成ERDAS ###

private IGeoDataset ProNoDataRaster(IGeoDataset pGeoDataset)
    {
        IGeoDataset my_GeoDataset = pGeoDataset;
        IRasterBandCollection pRBandCollection = my_GeoDataset as IRasterBandCollection;
        IRasterBand pRBand = pRBandCollection.Item(0);
        IRasterProps pRasterprops = pRBand as IRasterProps;
        pRasterprops.NoDataValue = 0;
        pRBand = pRasterprops as IRasterBand;
        pRBand.ComputeStatsAndHist();
        pRBandCollection = pRBand.RasterDataset as IRasterBandCollection; 
        return pRBandCollection as IGeoDataset;
    }

### 提取指定范围的栅格数据 ###

【两种方法】

*  IRasterLayerExport(esriCarto)：提供的栅格数据提取功能有限，只能以矩形范围作为提取范围
 *  IExtractionOp, IExtractionOp2 ：提供了多边形，圆，属性，矩形等几种形式作为提取栅格数据

// IRasterLayerEport
    IRasterLayerExport rLayerExport = new RasterLayerExportClass();
    rLayerExport.RasterLayer = rasterLayer;// rasterLayer指当前加载的栅格图层
    rLayerExport.Extent = clipExtent;//clipExtent指提取栅格数据的范围
    if (proSpatialRef != null)
    	rLayerExport.SpatialReference = proSpatialRef;// proSpatialRef当前栅格数据的投影信息
    IWorkspaceFactory pWF = new RasterWorkspaceFactoryClass();
    try
    {
    	IWorkspace pRasterWorkspace = pWF.OpenFromFile(_folder, 0);// _folder指栅格文件保存路径
    	IRasterDataset outGeoDataset = rLayerExport.Export(pRasterWorkspace, code, strRasterType);
    	// 调用ISaveAs接口将导出的数据集保存
    	// ...（省略）
    }
    Catch(Exception ex)
    {
    	Throw new Argumention(ex.Message);
    }
    // IExtractionOp
    IExtractionOp extraction = new RasterExtractionOpClass();
    try
    {
    	IGeoDataset geoDataset = extraction.Rectangle((IGeoDataset)clipRaster, clipExtent, true);
    	IRaster raster = geoDataset as IRaster;
    	if (raster != null)
    	{
    		IWorkspaceFactory WF = new RasterWorkspaceFactoryClass();
    		IWorkspace rasterWorkspace = WF.OpenFromFile(_folder, 0);
    		ISaveAs saveAs = (ISaveAs)raster;
    		saveAs.SaveAs(“Result.tif”, rasterWorkspace, 'TIFF');
    	}
    }
    catch (Exception ex)
    {
    	MessageBox..Show(Ex.message);
    }

### 栅格数据重采样 ###

// 双线性采样
    IRasterGeometryProc rasterGeometryProc = new RasterGeometryProcClass();
    rasterGeometryProc.Resample(rstResamplingTypes.RSP_CubicConvolution, newCellSize, clipRaster);

### TIN转Raster ###

public IRasterDataset tin2raster(string tempBathyTIN,string geoPath, string gridName)
    {
    	string tinFolder = System.IO.Path.GetDirectoryName(tempBathyTIN);
    	string tinName = System.IO.Path.GetFileName(tempBathyTIN);
    	IRasterDataset rasterDataset = new RasterDatasetClass();
    	try
    	{
    		string rasterPath = System.IO.Path.GetDirectoryName(geoPath);
    		IWorkspaceFactory TinWF = new TinWorkspaceFactory();
    		ITinWorkspace TinWK = TinWF.OpenFromFile(tinFolder,0)as ITinWorkspace;
    		ITinAdvanced2 tinAd = TinWK.OpenTin(tinName) as ITinAdvanced2;
    		IEnvelope extent = tinAd.Extent;
    		IPoint origin = extent.LowerLeft;
    		origin.X = origin.X - (5 * 0.5);
    		origin.Y = origin.Y - (5 * 0.5);
    		int nCol = (int)Math.Round(extent.Width / 5) + 1;
    		int nRow = (int)Math.Round(extent.Height / 5) +1;
    		
    		ISpatialReference2 spatialRef = (ISpatialReference2)extent.SpatialReference;
    		
    		IWorkspaceFactory rasterWF = new RasterWorkspaceFactoryClass();
    		IRasterWorkspace2 workSpace = (IRasterWorkspace2)rasterWF.OpenFromFile(rasterPath,0);
    		
    		rasterDataset = workSpace.CreateRasterDataset(gridName, 'GRID', origin,nCol,nRow,5,5,1,ESRI.ArcGIS.Geodatabase.rstPixelType.PT_FLOAT, spatialRef,true);
    		
    		
    		IRasterBandCollection bandColl = (IRasterBandCollection) rasterDataset;
    		IRasterBand rasterBand = bandColl.Item(0);
    		IRawPixels rawPixels = (IRawPixels)rasterBand;
    		IPnt blockSize = new DblPntClass();
    		blockSize.X = nCol;
    		blockSize.Y = nRow;
    		IPixelBlock3 pixelBlock = (IPixelBlock3)rawPixels.CreatePixelBlock(blockSize);
    		ITinSurface tinSurface = (ITinSurface)tinAd;
    		IRasterProps rasterProps = (IRasterProps)rawPixels;
    		object nodataFloat;
    		//long nodataInt;
    		object val = pixelBlock.get_PixelDataByRef(0);
    		MessageBox.Show(val.ToString());
    		double cellsize = 5;
    		origin.X = origin.X + (5 * 0.5);
    		origin.Y = origin.Y + (5 * nRow) - (5 * 0.5);
    		
    		nodataFloat = Convert.ToDouble(rasterProps.NoDataValue.ToString());
    		tinSurface.QueryPixelBlock(origin.X,origin.Y,cellsize,cellsize,esriRasterizationType.esriElevationAsRaster,nodataFloat,val);
    		IPnt offset = new DblPntClass();
    		offset.X = 0;
    		offset.Y = 0;
    		rawPixels.Write(offset,pixelBlock as IPixelBlock);
    	}
    	catch(Exception ex)
    	{
    		MessageBox.Show(ex.ToString());
    	}
    	return rasterDataset;
    
    }

[Link 1]: https://blog.csdn.net/Scarlett_OHara/article/details/51163599