A downscaling method for a soil water content product

Abstract

A downscaling method for a soil water content product is disclosed. The method includes A) acquiring passive microwave soil water content products of a region to be researched and optical remote sensing data at the same time, B) subjecting the optical remote sensing data to soil spectrum extraction based on a multiple endmember spectral mixture analysis process, C) building a model of a quantitative relation between soil spectrum reflection characteristics and soil water contents acquired from the passive microwave soil water content products by utilizing GA-PLS, and D) based on the model of the quantitative relation, building a soil water content downscaling model by utilizing the Taylor series expansion and acquiring soil water content data having a high spatial resolution. Advantages of passive microwave remote sensing data and optical remote sensing data on the temporal-spatial resolution are utilized in the method, and the passive microwave remote sensing data and the optical remote sensing data are effectively combined to acquire the soil water content data having the high spatial resolution, and therefore large-scale watershed scale region researching can be met, real-time or quasi real-time dynamic monitoring on watershed scale soil water contents is achieved, accuracy is high, building is easy and time and labor are saved.

Description

technical field [0001] The invention relates to the technical field of geographic surveying and mapping, in particular to a downscaling method for soil water content products. Background technique [0002] As one of the important indicators of climate and environmental drought, soil moisture content affects the physical and chemical properties of soil and the growth of vegetation, which in turn affects my country's grain production. At the same time, soil water content is an important part of surface energy balance and water cycle, and is an important monitoring factor in global change research. At present, various soil moisture data sets based on global observation site data are insufficient in the density and spatial representation of observation points, and the accuracy of simulation and forecast cannot meet the application requirements. [0003] Advanced Microwave Scanning Radiometer AMSR-2 (Advanced Microwave Scanning Radiometer for the Earth Observing System), soil mo...

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Problems solved by technology

[0006] The technical problem to be solved in the present invention is to provide a method for downscaling soil water content products, which can improve the spatial resolution of passive microwave soil water content data products, meet the application requirements of water resources and agricultural management at the watershed scale, and overcome the current soil water content. Insufficient spatial representation and low spatial resolution of water volume product datasets

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