ArcEngine修改像素值与像元值

这里要注意的是单波段的栅格数据，比如dem一般是不能修改像素值的。而dem的像元值一般代表它的高程。这里的把我研究的高程数据的像元值全部改成了0和1。它要注意的是由于修改像素是直接在原数据上直接修改，所以完成后原数据就会没有了，所以大家可以先复制一下原数据再做。

一。改变栅格数据像素值

 public void ChangeRasterValue(IRasterDataset2 pRasterDatset){IRaster2 pRaster2 = pRasterDatset.CreateFullRaster() as IRaster2;IPnt pPntBlock = new PntClass();pPntBlock.X = 128;pPntBlock.Y = 128;IRasterCursor pRasterCursor = pRaster2.CreateCursorEx(pPntBlock);IRasterEdit pRasterEdit = pRaster2 as IRasterEdit;if (pRasterEdit.CanEdit()){IRasterBandCollection pBands = pRasterDatset as IRasterBandCollection;IPixelBlock3 pPixelblock3 = null;int pBlockwidth = 0;int pBlockheight = 0;System.Array pixels;IPnt pPnt = null;object pValue;long pBandCount = pBands.Count;//获取Nodata//IRasterProps pRasterPro = pRaster2 as IRasterProps;//object pNodata = pRasterPro.NoDataValue;do{pPixelblock3 = pRasterCursor.PixelBlock as IPixelBlock3;pBlockwidth = pPixelblock3.Width;pBlockheight = pPixelblock3.Height;for (int k = 0; k < pBandCount; k++){pixels = (System.Array)pPixelblock3.get_PixelData(k);for (int i = 0; i < pBlockwidth; i++){for (int j = 0; j < pBlockheight; j++){pValue = pixels.GetValue(i, j);if (Convert.ToInt32(pValue) == 0 && isFlood[j, i] == true){pixels.SetValue(Convert.ToByte(50), i, j);}}}pPixelblock3.set_PixelData(k, pixels);}pPnt = pRasterCursor.TopLeft;pRasterEdit.Write(pPnt, (IPixelBlock)pPixelblock3);}while (pRasterCursor.Next());System.Runtime.InteropServices.Marshal.ReleaseComObject(pRasterEdit);MessageBox.Show("done");}}

还有就是根据IRaster2修改像素值

                IRasterBandCollection rasterbands = (IRasterBandCollection)pRasterDataset;IRasterBand rasterband = rasterbands.Item(0);IRawPixels rawpixels = (IRawPixels)rasterbands.Item(0);IRasterProps rasterpro = (IRasterProps)rasterband;IRasterDataset2 rasterDataset2 = (IRasterDataset2)pRasterDataset;IRaster raster = rasterDataset2.CreateFullRaster();IRaster2 raster2 = (IRaster2)raster;IPnt pBlockSize1 = new PntClass();IEnvelope envelope = rasterpro.Extent;pBlockSize1.SetCoords(envelope.Width, envelope.Height);IPixelBlock pixelBlock = raster2.CreateCursorEx(pBlockSize1).PixelBlock;int w = pixelBlock.Width;int h = pixelBlock.Height;//read the first pixel blockIPnt topleftCorner = new PntClass();topleftCorner.SetCoords(0, 0);raster.Read(topleftCorner, pixelBlock);//modify one pixel value at location (assume the raster has a pixel type of uchar)IPixelBlock3 pixelBlock3 = (IPixelBlock3)pixelBlock;System.Array pixels = (System.Array)pixelBlock3.get_PixelData(0);for (int finalX = 0; finalX < pRows; finalX++){for (int finalY = 0; finalY < pColumns; finalY++){if (isFlood[finalX, finalY] == true){pixels.SetValue(Convert.ToByte(100), finalY, finalX);}//else//{//    pPixelData.SetValue(0, finalY, finalX);//}}}pixelBlock3.set_PixelData(0, (System.Object)pixels);//write the modified pixel block to the raster datasetIRasterEdit rasterEdit = (IRasterEdit)raster;rasterEdit.Write(topleftCorner, pixelBlock);

二，栅格数据重分类，即修改栅格值

public void reclass(IRaster pRaster, double weight){//int trueCount = 0;//int falseCount = 0;IRasterProps rasterProps = (IRasterProps)pRaster;//设置栅格数据起始点IPnt pBlockSize = new Pnt();pBlockSize.SetCoords(rasterProps.Width, rasterProps.Height);//获取整个范围IPixelBlock pPixelBlock = pRaster.CreatePixelBlock(pBlockSize);// IPixelBlock3 pPixelBlock = (IPixelBlock3)pRaster.CreatePixelBlock(pBlockSize);//左上点坐标IPnt tlp = new Pnt();tlp.SetCoords(0, 0);//读入栅格IRasterBandCollection pRasterBands = pRaster as IRasterBandCollection;IRasterBand pRasterBand = pRasterBands.Item(0);IRawPixels pRawPixels = pRasterBands.Item(0) as IRawPixels;pRawPixels.Read(tlp, pPixelBlock);//将pixel的值组成数组System.Array pSafeArray = pPixelBlock.get_SafeArray(0) as System.Array;for (int y = 0; y < rasterProps.Height; y++){for (int x = 0; x < rasterProps.Width; x++){//int value = Convert.ToInt32(pSafeArray.GetValue(x, y));//Byte value = Convert.ToByte(pSafeArray.GetValue(x, y));//if (value != 0 && isFlood[y, x] == false)//{//    pSafeArray.SetValue((Byte)(value * weight), x, y);//}if (isFlood[y, x] == true){pSafeArray.SetValue(1, x, y);//trueCount++;}else{pSafeArray.SetValue(0, x, y);//falseCount++;}}}pPixelBlock.set_SafeArray(0, pSafeArray);//编辑raster,将更新的值写入raster中IRasterEdit rasterEdit = pRaster as IRasterEdit;rasterEdit.Write(tlp, pPixelBlock);rasterEdit.Refresh();int Fcount=0;//m_map.AddLayer//MessageBox.Show("ok");//double result = Convert.ToDouble(pSafeArray.GetValue(100, 99));}

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