Method and device for estimating soil humidity of vegetation coverage area

Abstract

The invention discloses a method and device for estimating the soil humidity of a vegetation coverage area, and belongs to the field of electronics, information and optical remote sensing. The methodcomprises the steps: firstly constructing a relation between an overall backward reflection coefficient and DDM reflection power through the data of a satellite-borne GNSS-R reflectometer; solving a vegetation reflection coefficient and an attenuation coefficient of the vegetation coverage area by utilizing the optical image data; fusing a relationship between a satellite-borne GNSS-R reflectometer data overall backward reflection coefficient and DDM reflection power and vegetation information in the optical data, and solving a relationship between a vegetation coverage area pure soil surfacereflection coefficient and the DDM reflection power; establishing a soil humidity and DDM reflection power regression model by utilizing the actually measured data of the soil humidity of the plurality of control points; and substituting GNSS-R data DDM reflection power of a certain point into the regression equation to invert the soil humidity. The implementation of the method is effective fusionof primary satellite-borne GNSS-R reflectometer data and multispectral remote sensing data images for jointly inverting the soil humidity of the vegetation coverage area.

Description

technical field [0001] The invention belongs to the technical fields of electronics, information and remote sensing, and more specifically relates to a method and device for estimating soil moisture based on fusion of space-borne GNSS-R reflectometer and multispectral data. Background technique [0002] Soil moisture is an important state parameter of the global water cycle, which plays a vital role in agricultural irrigation, environmental research, natural disaster early warning, and water and soil governance. [0003] At present, there are several methods for measuring soil moisture: traditional soil moisture measurement methods include gravimetric method, time domain reflection method, capacitive sensor, neutron meter, resistivity meter, thermal pulse sensor and optical fiber sensor. The advantage of the method is that the measurement accuracy is high, and the influence of vegetation can be removed. But the disadvantages are fixed-point measurement, small measurement ra...

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Problems solved by technology

[0008] In view of the above defects or improvement needs of the prior art, the present invention proposes a method and device for estimating soil moisture in vegetation-covered areas, thereby solving the technical problem that the existing methods for estimating soil moisture in vegetation-covered areas cannot effectively estimate soil moisture

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