摘要
土壤水分是全球水循环中不可或缺的部分,探测土壤湿度对于生态规划、水文模型构建、农业生产、干旱监测等具有重要意义.传统土壤湿度监测方法主要包括重量法、电阻法、时域反射计法等,存在监测区域小人力成本高等缺点,而卫星遥感能大范围探测土壤湿度变化趋势且时空分辨率高,是目前土壤湿度监测的主要方法.本文首先归纳了卫星遥感监测土壤湿度的方法类别,对卫星遥感中光学遥感和微波遥感两大类土壤湿度反演技术进行了总结分析;其次分别概述了两类遥感技术的基本原理,并对其反演方法进行了全面总结,包括对优缺点、适用区域、反演精度的分析;最后讨论了每类方法在土壤湿度反演发展中面临的挑战,并对土壤湿度反演的未来方向进行了展望.
Abstract
Soil moisture is an indispensable part of the global water cycle,and the soil moisture detection is of great significance for ecological planning,hydrological model construction,agricultural production,and drought monitoring.The traditional soil moisture monitoring methods mainly include weight method,resistance method,time domain reflectance method,etc.,which has the disadvantages of high small labor cost in the monitoring ar-ea,while satellite remote sensing can detect the change trend of soil moisture in a large range and has high spatial and temporal resolution,which is the main method of soil moisture monitoring at present.This paper firstly sum-marizes the methods of soil moisture monitoring by satellite remote sensing,summarizes and analyzes the meth-ods of optical remote sensing and microwave remote sensing.Secondly,it summarizes the basic principles of two kinds of remote sensing technologies,and comprehensively sums up their retrieval methods,including the analy-sis of the advantages and disadvantages,the applicable area and the retrieval accuracy.Finally it discusses the challenges faced by each method in the development of soil moisture retrieval and the future direction of soil mois-ture retrieval.
维普
万方数据