基于广西岩溶和非岩溶地貌的干旱遥感监测模型研究

根据MODIS植被指数和陆面温度,建立植被状态指教(VCI)、温度条件指数(TCI)和植被-温度指数(DI)模型;采用广西2004年10～11月数据,利用相关系数、全距和变异系数对3个干旱监测模型应用于广西岩溶区和非岩溶区大范围干旱监测的适用性进行了论证分析,结果表明:植被-温度指数模型(DI)最适用,温度条件指数(TCI)次之,植被状态指数(VCI)则较难胜任.并使用植被-温度指数DI模型监测了广西2005年秋旱,经与干旱实况对比,干旱指数DI的监测结果与实况相符,表明植被-温度指数遥感监测模型能准确反映出广西岩溶和非岩溶地貌环境的干旱时空变化特征,适用于广西大范围的干旱监测.

Research on drought remote sensing monitoring model of karstand non-karst geological environment areas in Guangxi

Land surface temperature and normalized different vegetation index derived from MODIS were used to establish vegetation condition index(VCI) model,temperature condition index(TCI) model and vegetation-temperature index(DI) model.Based on data from October to November in 2004,using correlation coefficients and R and CR,the reasonability of VCI,TCI and DI for drought monitoring in karst agriculture arid area and non-karst agriculture area in Guangxi was evaluated.The results showed that DI is the most promising method in monitoring drought for different geological environment in Guangxi;TCI has the potential on monitoring drought while VCI is not competent for monitoring drought in Guangxi.Using the DI,the temporal-spatial distribution of drought from September to November of 2005 in Guangxi was studied.The temporal-spatial pattern of DI was compared with the observed real drought condition in Guangxi.The validity of DI model in evaluating drought of different geological environment in Guangxi was verified.