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A method and device for estimating instantaneous surface emissivity by passive microwave remote sensing

A passive microwave remote sensing and surface emissivity technology, which is applied in the field of remote sensing data geoscience parameter inversion, can solve problems such as difficulty and inversion error of land surface parameterization, and achieve the effect of fast data collection and accurate image resolution.

Active Publication Date: 2020-03-06
INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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Problems solved by technology

[0004] Atmospheric water vapor, temperature profile, cloud identification, dew at night, and changes in soil moisture in the atmospheric parameters will directly affect the estimation of surface emissivity, and the most direct impact on the change of surface emissivity is due to atmospheric clouds. Covering, etc., makes it difficult to estimate the instantaneous surface emissivity. Under the condition of cloud cover, the information of the underlying surface is affected during the transmission process, so that the parameterized inversion of the land surface (such as soil moisture, surface temperature etc.) errors

Method used

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  • A method and device for estimating instantaneous surface emissivity by passive microwave remote sensing
  • A method and device for estimating instantaneous surface emissivity by passive microwave remote sensing
  • A method and device for estimating instantaneous surface emissivity by passive microwave remote sensing

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Embodiment 1

[0124] Embodiment one, the embodiment of the present invention selects two places in China to carry out the emissivity estimation test of 10.7GHz and 18.7GHz, and the surface coverage in the test area is mainly grassland (southeast region of the Qinghai-Tibet Plateau) and crops (central part of China), using The tested instantaneous surface emissivity distribution map (12-08-2006 ascending orbit), using these two areas to test the predictive ability of PR and MPDI emissivity. The data format is EASE-GRID (Equal-Area Scalable EarthGrid) grid.

[0125] On August 12, 2008, the effective launch rate sampling points were 505 and 157 points respectively. The emissivity prediction equations of Equations 4.15 (quadratic polynomial) and 4.16 (multiple / univariate linear regression) were established using both PR and MPDI polarization parameters. Table 1 shows the root mean square error (RMSE) of the emissivity obtained by the equation and its horizontally polarized emissivity. It can ...

Embodiment 2

[0134] Embodiment 2, the result of calculating the global surface emissivity at 36.5 GHz vertical and polarized emissivity by using the above method. The results show the expected spatial structure. The V polarization is greater than the H polarization, which is in line with the description of the model. The polarization difference in ice and snow-covered areas, such as the Antarctic continent and the ice and snow surface of Greenland, is due to the scattering on the ice and snow surface. The effect of the effect. The same phenomenon is shown in desert and semi-arid regions. The Qinghai-Tibet Plateau has low emissivity in both polarizations, and the same phenomenon also occurs in deserts and semi-arid regions, such as the Sahara Desert and central Australia.

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Abstract

The invention provides a passive microwave remote sensing instant ground surface emitting rate estimation method and device. The method or device comprises a step or a device for calculating the instant ground surface emitting rate under the clear sky condition through simultaneously observing the ground surface data by a satellite-borne passive microwave sensor and a middle-resolution imaging spectrograph, a step or a device for obtaining the horizontal and vertical polarization instant ground surface emitting rate at different frequencies, a step or a device for determining a microwave polarization difference index and the polarization rate according to the same frequency horizontal and vertical polarization according to thebrightening temperature of the same frequency horizontal and vertical polarization, a step or a device for calculating the horizontal emitting rate of the ground surface emitting rate under the cloud covering condition through building a quadratic polynomial and a linear regression equation according to the horizontal polarization emitting rate of the instant ground surface emitting rate, the microwave polarization difference index and the polarization rate. By using the method and the device in the technical scheme, the zoned local blocking test is performed in the global range; the estimation of the ground surface emitting rate under the global cloud layer covering condition is realized; important data basis is provided for the ground surface temperature reversion and atmospheric correction calculation.

Description

technical field [0001] The invention relates to a remote sensing data geoscience parameter inversion technology, in particular to a passive microwave remote sensing instantaneous surface emissivity estimation method and device. Background technique [0002] In the observation of the earth, the accurate simulation, estimation and understanding of the microwave emissivity emitted by the surface at different frequencies, different polarizations and different times is the basis for further development of microwave remote sensing applications, and it is also the basis for the application of microwave data to the ecological system. Models, radiative transfer models, climate models, land surface models, and important input parameters for atmospheric inversion on the ground from satellite passive microwave observations, especially in the inversion of atmospheric temperature and humidity profiles, surface temperature inversion, vegetation change monitoring, The characteristic informa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/11G06F30/20
CPCG16Z99/00
Inventor 邱玉宝郭华东施建成石利娟
Owner INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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