基于改进热惯量模型的表层土壤水反演研究

针对改进热惯量模型需要通过对地面实测的温度进行插值推算地表最高温度,而玛多县属高原地区,较难获取实测数据,利用MODIS地表温度产品的4个瞬时值计算日平均地表温度,结合修正普适性单通道算法反演HJ-1B地表温度,推算出地表最高温度,从而减少了改进热惯量模型对地面观测数据的依赖,进而利用HJ-1B数据反演了玛多县土壤水。结果表明:本文方法可行,能够获得较高分辨率的土壤水空间分布结果,拓宽了HJ-1B数据的应用范围。

The Study of Soil Moisture Retrieval Based on Improved Thermal Inertia Model

The maximum surface temperature in improved thermal inertia model usually calculate through the measured surface temperature,but Maduo County in plateau region is difficult to get this data,MODIS surface temperature product of four instantaneous values was used for calculate the average surface temperature,and the improved generalized single-channel algorithm was adopted for retrieved surface temperature from HJ-1data,then we can calculate the maximum surface temperature use HJ-1 surface temperature and the average surface temperature to retrieval the Maduo County soil moisture.The surface albedo and surface temperature inversion results were verified by using MODIS BRDF/Albedo product and the ground measured data respectively.This method is feasible and can obtain the spatial distribution of soil moisture with high resolution,and also reduces the dependence on the ground observation data.