在vs上安装vbpshi必须要用到的文件，是自从广泛包-Osg+ 2008+ 2010 installation files, main is to teach how to vs2008 and installed on the steps vs2010 osg

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.