AE IRasterCursor 改变栅格图层像素值

刚刚说的是获取像素值。如果要进一步改变像素值的话，需要用到IRasterEdit接口的Write方法。Write方法的参数有两个，一个是在栅格图像中的左上角位置（行列值不是坐标值），另一个就是获取像素值时提到的PixelBlock. 执行完Write方法后要对实现IRasterEdit接口的对象进行释放。

public void ChangePixelValue(double xMax, double xMin, double yMax, double yMin,double[,] PixelChanged)
{
    IRaster pRaster = thisRasterLayer.Raster;
    IRaster2 pRaster2 = pRaster as IRaster2;       
      
    //地图坐标转换为图中行列值
    rowMax = pRaster2.ToPixelRow(yMin);
    rowMin = pRaster2.ToPixelRow(yMax);
    columnMin = pRaster2.ToPixelColumn(xMin);
    columnMax = pRaster2.ToPixelColumn(xMax);
      
    int Height = rowMax - rowMin + 1;
    int Width = columnMax - columnMin + 1;
      
    //按照需要的大小建立一个空的PixelBlock3
    IPnt blocksize = new PntClass();
    blocksize.SetCoords(Width, Height);
      
    IPixelBlock3 pPixelBlock3 = pRaster.CreatePixelBlock(blocksize) as IPixelBlock3;
      
    System.Array pixels = (System.Array)pPixelBlock3.get_PixelData(0);
      
    //为新建的PixelBlock赋值
    try
    {
        for (int i = 0; i < Height; i++)
        {
            for (int j = 0; j < Width; j++)
            {
                pixels.SetValue(Convert.ToByte(PixelChanged[i,j]), j, i);
            }
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
      
    //把像素值赋予新建的PixelBlock3
    pPixelBlock3.set_PixelData(0, pixels);
      
    //PixelBlock3应在的位置
    blocksize.SetCoords(columnMin, rowMin);
      
    //改变的像素值写入图层
    IRasterEdit pRasterEdit = pRaster as IRasterEdit;
    pRasterEdit.Write(blocksize, (IPixelBlock)pPixelBlock3);
    pRasterEdit.Refresh();
      
    System.Runtime.InteropServices.Marshal.ReleaseComObject(pRasterEdit);    
}

修改过的图层需要保存：

//要保存的图层；
IRasterLayer pRasterLayer = axMapControl1.get_Layer(0) as IRasterLayer;  
IRaster pRaster = pRasterLayer.Raster;
IRaster2 pRaster2 = pRaster as IRaster2;
    
ISaveAs pSaveAs = pRaster2 as ISaveAs;
pSaveAs.SaveAs(@"F:\Work\DEM高程矩阵\DEM高程矩阵\bin\Debug\渲染图层2.tif", null, "TIFF");