The aim is to find a way to explore both the spectral advantage of multispetral data and the ability of high spatial resolution image toreflect details and update big scale map . sar data may be utilized as supplement of optical data under bad weather conditions in austral areas 目的是探索在南方地区，如何充分发挥tm etm +影像在光谱分辨率上的优势和高分辨率卫星影像在刻画细节、大比例尺图件更新中的能力、以及云雨条件下利用雷达数据补充光学数据不足的方法。
