基於Dataset 

public CPLErr ReadRaster(int xOff, int yOff, int xSize, int ySize, byte[] buffer, int buf_xSize, int buf_ySize, int bandCount, int[] bandMap, int pixelSpace, int lineSpace, int bandSpace)

int[] dataArray = new int[srcWidth * srcHeight * bandCount];

xOff和yOff是指偏移量，即從影像的左上角起始座標（xOff,yOff）開始讀取資料。

xSize和ySize是指讀取影象資料的行列數，即寬度和高度，單位都是畫素。

Buffer是影象資料快取區域（陣列），要根據檔案型別重新定義 const char*   GDALGetDataTypeName(poBand->GetRasterDataType())  。

buf_xSize和buf_ySize是快取區的大小，預設的GDAL支援重取樣，它們須與buffer申請的大小保持一致，通過這兩個引數可以控制影像的縮放，如果它們小於xSize和ySize就是將原圖縮小，反之如果它們大於xSize和ySize就是將原圖放大。

pixelSpace和lineSpace一般預設取0即可。ReadRaster最後三個引數全是0，預設按照波段順序儲存 。

pixelSpace設定成1，則隔一個畫素點讀取一個畫素點的方式讀取影象。

Ds.ReadRaster(0, 0, srcWidth, srcHeight, dataArray, srcWidth, srcHeight, bandCount, bandArray, 0, 0, 0);

public CPLErr WriteRaster(int xOff, int yOff, int xSize, int ySize, byte[] buffer, int

        /// <summary>
        /// GDAL柵格轉換為點陣圖
        /// </summary>
        /// <param name="ds">GDAL Dataset</param>
        /// <param name="showRect">顯示區域</param>
        /// <param name="bandlist">需要顯示的波段列表</param>
        /// <returns>返回Bitmap物件</returns>
        public Bitmap GetImage(OSGeo.GDAL.Dataset ds, Rectangle showRect, int[] bandlist)
        {
            int imgWidth = ds.RasterXSize;   //影像寬
            int imgHeight = ds.RasterYSize;  //影像高

            float ImgRatio = imgWidth / (float)imgHeight;  //影像寬高比

            //獲取顯示控制元件大小
            int BoxWidth = showRect.Width;
            int BoxHeight = showRect.Height;

            float BoxRatio = imgWidth / (float)imgHeight;  //顯示控制元件寬高比

            //計算實際顯示區域大小，防止影像畸變顯示
            int BufferWidth, BufferHeight;
            if (BoxRatio >= ImgRatio)
            {
                BufferHeight = BoxHeight;
                BufferWidth = (int)(BoxHeight * ImgRatio);
            }
            else
            {
                BufferWidth = BoxWidth;
                BufferHeight = (int)(BoxWidth / ImgRatio);
            }

            //構建點陣圖
            Bitmap bitmap = new Bitmap(BufferWidth, BufferHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);

            if (bandlist.Length == 3)     //RGB顯示
            {
                int[] r = new int[BufferWidth * BufferHeight];
                Band band1 = ds.GetRasterBand(bandlist[0]);
                band1.ReadRaster(0, 0, imgWidth, imgHeight, r, BufferWidth, BufferHeight, 0, 0);  //讀取影象到記憶體

                //為了顯示好看，進行最大最小值拉伸顯示
                double[] maxandmin1 = { 0, 0 };
                band1.ComputeRasterMinMax(maxandmin1, 0);

                int[] g = new int[BufferWidth * BufferHeight];
                Band band2 = ds.GetRasterBand(bandlist[1]);
                band2.ReadRaster(0, 0, imgWidth, imgHeight, g, BufferWidth, BufferHeight, 0, 0);

                double[] maxandmin2 = { 0, 0 };
                band2.ComputeRasterMinMax(maxandmin2, 0);

                int[] b = new int[BufferWidth * BufferHeight];
                Band band3 = ds.GetRasterBand(bandlist[2]);
                band3.ReadRaster(0, 0, imgWidth, imgHeight, b, BufferWidth, BufferHeight, 0, 0);

                double[] maxandmin3 = { 0, 0 };
                band3.ComputeRasterMinMax(maxandmin3, 0);

                int i, j;
                for (i = 0; i < BufferWidth; i++)
                {
                    for (j = 0; j < BufferHeight; j++)
                    {
                        int rVal = Convert.ToInt32(r[i + j * BufferWidth]);
                        rVal = (int)((rVal - maxandmin1[0]) / (maxandmin1[1] - maxandmin1[0]) * 255);
                        int gVal = Convert.ToInt32(g[i + j * BufferWidth]);
                        gVal = (int)((gVal - maxandmin2[0]) / (maxandmin2[1] - maxandmin2[0]) * 255);
                        int bVal = Convert.ToInt32(b[i + j * BufferWidth]);
                        bVal = (int)((bVal - maxandmin3[0]) / (maxandmin3[1] - maxandmin3[0]) * 255);
                        Color newColor = Color.FromArgb(rVal, gVal, bVal);
                        bitmap.SetPixel(i, j, newColor);
                    }
                }
            }
            else               //灰度顯示
            {
                int[] r = new int[BufferWidth * BufferHeight];
                Band band1 = ds.GetRasterBand(bandlist[0]);
                band1.ReadRaster(0, 0, imgWidth, imgHeight, r, BufferWidth, BufferHeight, 0, 0);
                double[] maxandmin1 = { 0, 0 };
                band1.ComputeRasterMinMax(maxandmin1, 0);

                int i, j;
                for (i = 0; i < BufferWidth; i++)
                {
                    for (j = 0; j < BufferHeight; j++)
                    {
                        int rVal = Convert.ToInt32(r[i + j * BufferWidth]);
                        rVal = (int)((rVal - maxandmin1[0]) / (maxandmin1[1] - maxandmin1[0]) * 255);
                        Color newColor = Color.FromArgb(rVal, rVal, rVal);
                        bitmap.SetPixel(i, j, newColor);
                    }
                }
            }
            return bitmap;
        }

讀寫影像資料（基於Band）

public CPLErr ReadRaster(int xOff, int yOff, int xSize, int ySize, byte[] buffer, int buf_xSize, int buf_ySize, int pixelSpace, int lineSpace)