基于MODIS数据的多种干旱监测方法在锡林郭勒草地上的对比分析

A Variety of Drought Monitoring Method Based on MODIS Data in Xilingol Grassland on the Comparison and Analysis

干旱作为最为严重的自然灾害之一,其发生次数多,持续时间长,涉及范围大,造成的损失严重,直接影响着人类社会经济活动的方方面面。本文利用2010年4,5,6,7,8,9月MODIS-NDVI产品MOD13A3和温度产品MOD11A2,分别构建温度植被干旱指数,温度状态指数以及距平植被指数模型,对锡林郭勒地区干旱情况进行反演,并将反演结果与标准化降水指数进行敏感性分析和土壤相对湿度进行相关性分析,研究表明:(1)在敏感性方面,各遥感指数与标准化降水指数的相关性未能达到显著性效果,因此,用标准化降水指数来反映遥感指数的对干旱的敏感性不够理想。(2)在相关性方面,距平植被指数与土壤相对湿度具有较好的相关性,能够反映空间数据特征,作为干旱监测指标具有科学合理性。(3)从空间分布上看,锡林郭勒地区西南部湿度较高,东北部湿度较高,中部属于过渡地区,该地区大部分面积呈现干旱现象。

As one of the most serious natural large range, damage is serious, a direct impact on per, by-using MODIS NDVI products MOD13A3 disasters, drought occurred more frequently, long duration and every aspect of human social and economic activities. In this pa- and temperature products MODllA2, building the temperature vegetation drought index respectively, temperature condition index, and analyzed the vegetation index model, to the inversion of xilingol regional drought conditions, and the inversion results with standardized precipitation index and soil relative humidity sensitivity analysis, correlation analysis research shows that ： （ 1 ） in terms of sensitivity, the correlation of the remote sensing and standardized precipitation index failed to achieve significant effect, therefore, using standardized precipitation index to reflect the sensitivity to drought index of the remote sensing is not ideal. （2） in terms of relevance, analyzed the vegetation index and soil relative humidity has good correlation, can reflect the characteristics of the spatial data, as indicators of drought monitoring with scientific rationality. （3） from the point of view of spatial distribution, south - west of xilingol humidity is higher, humidity is higher, in the northeast of central belongs to the transitional region, the region most area of droughts.