基于MODIS数据的西藏干旱自动监测系统实现的关键技术研究

The research of the key technique of Tibet automatic drought monitoring system using MODIS data

干旱是一种危害较大的自然灾害,影响范围大、持续时间长.随着经济发展和人口的增加,水资源短缺现象日益严重,这也导致了干旱范围的扩大和干旱化程度加重.为降低业务人员负担,提高业务工作效率,探讨了基于MODIS遥感数据的西藏干旱监测系统实现的关键技术.首先,阐述了MODIS轨道数据快速投影处理的正向投影处理技术原理,然后分析了温度植被干旱指数算法(TVDI)及其实现,最后,将干旱监测方法集成到业务系统软件,最终实现西藏全区的干旱遥感监测业务工作.通过与传统手工干旱监测方法进行对比,发现干旱自动监测系统具有速度快、自动化等优点,具有十分重要的实践意义.

Drought,characterized by large harmful area and long harmful duration,is a common harmful disaster in the Tibetan Plateau. With the increasing economic development and population,water shortage is increasing seriously,which leads to the drought area expansion and drying degree aggravating. A method has been proposed,which apply the temperature vegetation drought index（ TVDI） to remotely sense the drought in the Tibetan Plateau. The recent work is focus on the key technique how to use the MODIS remote sensing data to develop a drought monitoring system. First,a quick MODIS orbital data processing technique using the forward projection is explained. Then an algorithm of the TVDI is explored. Finally,an operational software of the drought monitoring system is developed and applied to the Tibetan drought monitoring,which greatly reduces the labor and improves the work efficiency. Compared with the traditional manual drought monitoring,the new drought monitoring system has not only an advantage of rapid and automatic processing,but also a very important practical significance.