MODIS在青藏高原大范围积雪制图中的应用及存在的问题

Applications and Limitations of a Snow Mapping Algorithm Based on MODIS Data in Qinghai-Tibet Plateau

积雪是地球表面重要的组成部分之一,精确监测积雪覆盖及其动态变化是地球科学的一个重要研究方向。本文以我国主要积雪区之一的青藏高原作为研究区域,研究了MODIS数据在青藏高原大范围积雪制图中的应用。使用基于NDSI阈值法的积雪像元识别方法,对2002-2003年度青藏高原的积雪状况进行了监测。对监测结果的分析表明,虽然这种算法目前还存在一些不足,但对青藏高原大区域的积雪监测仍是一种极为有效的方法。

Snow covers an important part of earth surface. Snow mapping and snow dynamic monitoring constitute an important part of earth science. This paper proposes an algorithm of snow mapping based on MODIS data in Qinghai-Tibet Plateau. The dynamic changes of snow between 2002 and 2003 were monitored by using the NDSI threshold method. The results indicate that this algorithm is effective for snow mapping in large-scale regions despite of some limitations.