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Surface soil moisture inversion method based on passive microwave remote sensing data

A passive microwave remote sensing and surface soil technology, which is applied in the direction of using microwaves to test moisture content, etc., can solve the problems of reducing the global effective land coverage ratio of data products and limiting applications

Active Publication Date: 2018-12-11
ZHEJIANG UNIV
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Problems solved by technology

Although this improves the overall accuracy of global inversion, it also reduces the global effective land coverage ratio of this set of data products to a certain extent, which limits the application of this product on a global scale, especially in areas with relatively humid surfaces, rivers and lakes. Applications in more tropical and subtropical regions

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  • Surface soil moisture inversion method based on passive microwave remote sensing data
  • Surface soil moisture inversion method based on passive microwave remote sensing data
  • Surface soil moisture inversion method based on passive microwave remote sensing data

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Embodiment Construction

[0048] Step 1. Collect and organize the passive microwave brightness temperature dataset and the soil texture dataset; obtain the microwave brightness temperature distribution map and corresponding distribution map of the soil composition. The microwave brightness temperature data include: the vertical and horizontal polarization brightness temperature data of the X-band, and the vertical and horizontal polarization brightness temperature data of the K-band (18GHz and 23.8GHz); the microwave brightness temperature data collected by the present invention are available on the official website of NASA ( Website: AMSR-E / AMSR2L2A sub-orbit storage brightness temperature data set provided by NASA's Earth Observing System Data and Information System). The time range of the AMSR-E data set is from May 2002 to September 2011; the time range of the AMSR2 data set is from July 2012 to the present. The storage format of the sub-orbital data set is that each orbital file includes 243 rows...

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Abstract

The invention discloses a surface soil moisture inversion method based on passive microwave remote sensing data. The method comprises the following steps that a soil component spatial distribution image and a microwave brightness temperature spatial distribution image of each wave band are acquired; the average effective temperature of the earth surface is calculated by utilizing vertical and horizontal polarization brightness temperature data of a K waveband, and a microwave brightness temperature polarization difference index of an X waveband is constructed by utilizing vertical and horizontal polarization brightness temperature data of the X waveband; the surface average effective temperature and the microwave brightness temperature polarization difference index of the X waveband are substituted into a soil dielectric constant mathematical model and a microwave radiation transfer model so as to solve the optical thickness of vegetation and the dielectric constant of soil; and the dielectric constant of the soil is substituted into a soil moisture content inversion model, and calculation is made so as to acquire the surface soil moisture content. The method has the advantage thatafter verification, compared with a data value obtained through an original algorithm, and a data value of the soil moisture content calculated through an improved inversion algorithm has higher inversion precision under a waterish surface condition.

Description

technical field [0001] The invention relates to the technical field of remote sensing surface soil moisture content inversion, in particular to a surface soil moisture inversion method based on passive microwave remote sensing data. Background technique [0002] Soil water is an unsaturated water body in the soil layer, which is widely distributed on the land surface and is a necessary water source for plant growth. Therefore, soil water resources are important resources related to the quality of agricultural production; at the same time, soil water resources are the interaction between surface water and groundwater. The link of transformation, which can enter the atmosphere in the form of evapotranspiration and be replenished in the soil surface in the form of precipitation, can be said to be the core factor in the exchange of surface energy and an important carrier component of the global surface material energy cycle. The distribution of soil water resources on a global s...

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Application Information

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IPC IPC(8): G01N22/04
CPCG01N22/04
Inventor 宋沛林黄敬峰
Owner ZHEJIANG UNIV
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