基于MODIS资料的西藏遥感积雪监测业务化方法

雪灾是西藏地区藏北一线、南部边缘地区对牧业生产影响最严重的灾害之一,利用卫星遥感资料开展积雪监测,提供监测信息产品具有重要的现实意义.利用拉萨接收站接收的中分辨率成像光谱仪(MODIS)卫星遥感资料对西藏高原积雪的监测方法进行了探讨,找出适合该地区的积雪判别模式,建立MODIS资料为基础的积雪监测系统.基于MODIS数据计算得出的归一化差分积雪指数(NDSI)和归一化植被指数(NDVI)与1、2、4、6通道等相结合,建立积雪监测模型是可行的;得出的积雪判识方法对于西藏地区有较高的适用性,如结合地表土地利用类型数据将有林区和非森林区分开计算,能较好地消除藏东南地区因地势复杂、森林茂密对NDSI的影响.

Practical Method for Monitoring Snow in Tibet Plateau Based on MODIS Data

The snow disaster is the most serious natural disaster for local animal husbandry in northern and southern border areas of Xizang. Using satellite remote sensing data to develop snow monitoring system and provide monitoring information has a practical significance. A method of snow monitoring based on the Tibet Plateau snow identification model using the MODIS data from Lhasa station is described. The result shows that it is feasible to develop the snow identification model through combining MODIS NDSI and NDVI with the data of channels 1, 2, 4, 6; and the model is useful for snow disaster monitoring in Tibet Plateau and can improve the accuracy of the model through considering the differences in land cover between forest and the non forest areas in the eastern and southern Tibet Plateau especially.