A Review of Methods for Retrieving Soil Moisture from Satellite Remote Sensing Data
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.
万方数据
维普
