A Satellite Remote Sensing Estimation Method of Surface Soil Moisture Content without the Effect of Vegetation Coverage

A soil water content and satellite remote sensing technology, which is applied in the field of satellite remote sensing estimation of surface soil water content affected by vegetation cover, and can solve the problem of less estimated soil water content

Inactive Publication Date: 2021-07-30
QINGHAI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because it is easy to operate, it can be combined with other models to estimate vegetation transpiration, surface flux, and soil evaporation, but the estimation of soil water content is less

Method used

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  • A Satellite Remote Sensing Estimation Method of Surface Soil Moisture Content without the Effect of Vegetation Coverage
  • A Satellite Remote Sensing Estimation Method of Surface Soil Moisture Content without the Effect of Vegetation Coverage
  • A Satellite Remote Sensing Estimation Method of Surface Soil Moisture Content without the Effect of Vegetation Coverage

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Experimental program
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Embodiment 1

[0104] This embodiment provides a method for estimating surface soil water content by satellite remote sensing without the influence of vegetation coverage. The steps of this method include (1) materials and data; (2) calculation of auxiliary parameters (calculation of surface albedo and vegetation coverage); (3) Decompose the bare soil albedo from the surface albedo; (4) Remote sensing estimation model and mapping of soil moisture content; (5) Evaluation of the accuracy of the estimation method.

[0105] (1) Materials and data

[0106] (a) Measured data of soil moisture content

[0107] Field soil samples were collected from September 27 to October 4, 2016. Soil samples from the surface (0-10 cm, 10-20 cm, 20-30 cm) were taken by the ring knife method. After the sample is brought back to the laboratory, it is measured as follows:

[0108] Preparations: number and weigh the aluminum boxes indoors, and record the weight as W 0 .

[0109] Sampling: Take about 50 g of the so...

Embodiment 2

[0184] Example 1 is to visually select typical features on the remote sensing image (requires a professional technical background in remote sensing to accurately identify these typical features), and then obtain the vegetation coverage and surface albedo values ​​of these typical features at the geographic location, and draw The actual surface albedo-vegetation coverage trapezoidal space. In order to make this method more general, the research area can be divided into a certain number of grids, and then the vegetation coverage and surface albedo values ​​at each grid position can be extracted, and then the actual surface albedo-vegetation coverage can be drawn trapezoidal space. The specific method is as follows:

[0185] First, use the fishnet tool of ArcGIS 10 software to divide the research area into a grid of 500 m*500 m (if the research area is large, it can be divided into grids of 1 km*1 km or 10 km*10 km).

[0186] Then, use the Extract MultiValues ​​To Points tool o...

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Abstract

The invention provides a method for estimating surface soil water content by satellite remote sensing without the influence of vegetation coverage. The steps of the method include (1) materials and data; (2) calculation of auxiliary parameters (calculation of surface albedo and vegetation coverage); 3) Decompose the bare soil albedo from the surface albedo; (4) Remote sensing estimation model and mapping of soil moisture content; (5) Evaluation of the accuracy of the estimation method. This method directly uses the albedo of bare soil to calculate soil water content, and the physical meaning of remote sensing is clear, highlighting the essential connotation of satellite remote sensing to estimate soil water content; it overcomes the traditional method (based on the surface albedo method, such as Pei Hao et al. 1999) It is necessary to calculate and measure the defects of intermediate parameters, which avoids the transmission of errors between parameters, has no redundant intermediate links, and is simple and easy to implement; it breaks through the limitations of regional conditions that traditional methods (such as optical vegetation coverage methods) must have. The method achieves reliable, stable, and high-precision estimation of surface soil water content over arbitrarily large areas.

Description

technical field [0001] The invention relates to the application technology of satellite remote sensing, in particular to a method for estimating surface soil water content by satellite remote sensing without the influence of vegetation coverage. Background technique [0002] Soil water content is the basic condition for plant growth and development, and it is also an effective factor for drought monitoring in agriculture and animal husbandry, which has a profound impact on various physical and chemical properties of soil. It participates in the material and energy cycle of the biosphere and the atmosphere, indirectly determines and changes the absorption, reflection and emission of the solar short-wave radiation and surface long-wave radiation on the land surface, and then affects the energy balance of the earth system. Therefore, soil water content plays an important role in the research of agriculture, terrestrial ecosystem, climate and other fields, and the accurate and r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/17
CPCG01N21/17G01N2021/1765G01N2021/178G01N2021/1797
Inventor 吴成永陈克龙曹广超鄂崇毅高小红巴丁求英蒋刚
Owner QINGHAI NORMAL UNIV
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