本文共 2359 字，大约阅读时间需要 7 分钟。

栅格重分类方法很多，在AE中有多种方式可以实现，使用地图代数（在RasterModel中实现），或者IReclassOp，或者Geoprocessor的方式都可以，甚至可以遍历栅格来实现，这是最原始的方式，不过也可能是最实用的。这里使用的是最原始的遍历栅格的方式。

public static void StrechDN(IRasterLayer pRasterLayer, int OTSU,int minValue, int maxValue)//修改二值化后的像素值    {        //获取栅格像素块        IRaster pRaster = pRasterLayer.Raster;        IRasterProps pRasterProps = (IRasterProps)pRaster; //rasterband;        //设置像素块的大小        IPnt pBlockSize1 = new PntClass();              pBlockSize1.SetCoords(pRasterProps.Width, pRasterProps.Height);        IPixelBlock pixelBlock = pRaster.CreatePixelBlock(pBlockSize1);// raster2.CreateCursorEx(pBlockSize1).PixelBlock;        int w = pixelBlock.Width;        int h = pixelBlock.Height;        //read the first pixel block,左上点坐标          IPnt topleftCorner = new PntClass();        topleftCorner.SetCoords(0, 0);//左上角第一个像素点        pRaster.Read(topleftCorner, pixelBlock);//从第一个点开始读pixelBlock大小的像素块        //modify one pixel value at location (assume the raster has a pixel type of uchar)        IPixelBlock3 pixelBlock3 = (IPixelBlock3)pixelBlock;        object pValue;        System.Array pixels = (System.Array)pixelBlock3.get_PixelData(0);        for (int finalX = 0; finalX < pRasterProps.Width; finalX++)        {            for (int finalY = 0; finalY < pRasterProps.Height; finalY++)            {                pValue = pixels.GetValue(finalX, finalY);                if (Convert.ToDouble(pValue) < OTSU)                {                    pixels.SetValue(minValue, finalX, finalY);                }                else                {                    pixels.SetValue(maxValue, finalX, finalY);                }            }        }                 pixelBlock3.set_PixelData(0, (System.Object)pixels);        //write the modified pixel block to the raster dataset        IRasterEdit rasterEdit = (IRasterEdit)pRaster;        rasterEdit.Write(topleftCorner, pixelBlock);        rasterEdit.Refresh();//刷新资源        System.Runtime.InteropServices.Marshal.ReleaseComObject(rasterEdit);//停止编辑     }

将IRasterLayer存储起来的方法

public static void SaveRasterLayerTofile(IRasterLayer pRasterLayer, string fileName, string strFileExtension="TIFF") {        IRaster pRaster = pRasterLayer.Raster;        IRaster2 pRaster2 = pRaster as IRaster2;        ISaveAs pSaveAs = pRaster2 as ISaveAs;        pSaveAs.SaveAs(fileName, null, strFileExtension);}

转载地址：http://szden.baihongyu.com/