使用gdal实现影像的矩形裁剪，可以根据需要确定起始位置以及确定要裁剪的大小。-Use gdal achieve rectangle cropped image, you can determine the starting position and to determine the size needed to be cropped.

批量裁剪，实现统一区域的大量影像数据裁剪。(Batch cropping, to achieve a large number of regional image data cutting.)