宁南山区土壤含水量遥感监测研究

摘要

选用2013年6～8月宁南山区Terra/MODIS地表反射率产品MOD13A2和地表温度产品MOD11A2数据，获取增强型植被指数EVI和地表温度LST。通过构建LST-EVI特征空间，得到温度、植被干旱指数TVDI反应各时段土壤含水量空间分布情况，以此来监测宁南山区土壤含水量空间分布及变化趋势。结合气象站点0～20 cm土壤湿度数据进行相关性分析，结果表明：此方法适合应用于宁南山区的土壤含水量及旱情监测。%The surface reflectance data MOD13A2 and land surface temperature data of MODIS product in the mountain area of southern Ningxia from June to August in 2013 were used to obtain the enhanced vegetation index ( EVI) and land surface temperature (LST). The conditional temperature vegetation dryness index (TVDI) reflecting the soil moisture content of each period were calculated by establishing the LST- EV I feature space for monitoring the spatial distribution and tendency of the soil moisture content in the mountain area of southern Ningxia. Based on 0-20cm soil moisture data from meteorological stations, a correlation analysis was made. The results showed that this method was suitable for monitoring the soil moisture and drought situation of the mountain area of southern Ningxia.