多极化、多角度裸露地表土壤水分反演模型研究

Soil moisture monitor is always a focus in hydrological, meteorological and environmental agriculture researches. In the past several decades, large scale soil moisture monitor by remote sensing, such as optical, infrared, and microwave methods have developed rapidly. Common methods and optical remote sensing have their own shortcoming in soil water monitor, thus cannot reach the need of soil water monitor. Active microwave techniques, particularly SAR, take advantage of their all-weather and night-and-day measurement capacities, so it offers a new way to monitor soil moisture in drainage scale. In recent year, four models have been frequently mentioned in soil moisture inversion, which are Oh model, Dubois model, Shi model and IEM model. This article discusses the current research methods of bare surface soil moisture, analyzes the advantages and disadvantages of each model and use scope, the authors proposed the research direction of inversion the exposed surface soil moisture.