中文说明：在图像处理中对于比较大地图像，为了加快处理地速度，将图像按照比例进行缩小处理。-In Image Processing Landsat images for comparison, in order to speed up the processing speed, will reduce the image in accordance with the proportion of treatment.
English Description：
In Image Processing Landsat images for comparison, in order to speed up the processing speed, will reduce the image in accordance with the proportion of treatment.