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Method and device for estimating longwave net radiation and downlink radiation using shortwave radiation

A technology of long-wave downstream radiation and long-wave net radiation, which is applied in the field of remote sensing and can solve the problems of spatial discontinuity of radiation products

Active Publication Date: 2017-12-08
INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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Problems solved by technology

[0005] This application provides a method and device for estimating long-wave net radiation and downlink radiation by using short-wave radiation, which is used to solve the technical problem of spatial discontinuity of radiation products retrieved by optical remote sensing in the prior art

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  • Method and device for estimating longwave net radiation and downlink radiation using shortwave radiation
  • Method and device for estimating longwave net radiation and downlink radiation using shortwave radiation
  • Method and device for estimating longwave net radiation and downlink radiation using shortwave radiation

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Embodiment 1

[0035] Embodiment 1 of the present invention provides a method for estimating long-wave downlink radiation by using short-wave radiation, such as figure 1 As shown, the method includes the following steps S102 to S112.

[0036] Step S102: Obtain short-wave net radiation samples and long-wave net radiation samples.

[0037] Specifically, when acquiring sample data, a radiation transfer model may be used for simulation to generate short-wave net radiation data and long-wave net radiation data as short-wave net radiation samples and long-wave net radiation samples, respectively.

[0038] For example, taking the radiative transfer model as MODTRAN5 as an example, set different atmospheric temperature / humidity profiles, aerosol types, horizontal meteorological sight distances, surface albedo\emissivity, surface temperature, cloud types, cloud heights, cloud A series of parameters such as water content, solar zenith angle, observation zenith angle, and relative azimuth angle are si...

Embodiment 2

[0059] Embodiment 2 of the present invention provides a method for estimating long-wave downlink radiation by using short-wave radiation. In this method, clear-sky conditions are taken as the premise, such as figure 2 As shown, the method includes the following steps S202 to S220.

[0060] Step S202: Set simulation parameters for clear sky conditions, and generate short-wave net radiation and long-wave net radiation through MODTRAN5 transmission model simulation.

[0061] Step S204: Collect short-wave net radiation and long-wave net radiation under clear-sky conditions observed by the observation site.

[0062] Step S206: Obtain the surface albedo, the average temperature and the average humidity at the bottom of the atmosphere under clear sky conditions.

[0063] Step S208: Taking short-wave net radiation, surface albedo, average temperature and average humidity at the bottom of the atmosphere as input data samples, and long-wave net radiation as output data samples, establ...

Embodiment 3

[0072] Embodiment 3 of the present invention provides a method for estimating long-wave downlink radiation by using short-wave radiation. In this method, cloudy conditions are taken as the premise, such as image 3 As shown, the method includes the following steps S302 to S322.

[0073] Step S302: Set simulation parameters with cloud conditions, and generate short-wave net radiation and long-wave net radiation through SBDART transmission model simulation.

[0074] Step S304: Collect short-wave net radiation and long-wave net radiation observed at the observation site under cloudy conditions.

[0075] Step S306: Obtain the surface albedo, the average temperature and the average humidity at the bottom of the atmosphere under cloudy conditions.

[0076] Step S308: Taking short-wave net radiation, surface albedo, average temperature and average humidity at the bottom of the atmosphere as input data samples, and long-wave net radiation as output data samples, establish the relatio...

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Abstract

The invention provides a method of using shortwave radiation to estimate long-wave net radiation and downlink radiation and an apparatus thereof. The method of using shortwave radiation to estimate long-wave net radiation comprises the following steps of acquiring a short wave net radiation sample and a long wave net radiation sample; establishing a mathematical relationship between the short wave net radiation sample and the long wave net radiation sample; acquiring a remote sensing image to be processed; calculating the short wave net radiation corresponding to the remote sensing image; substituting the short wave net radiation into the mathematical relationship so that the long wave net radiation corresponding to the remote sensing image is acquired; and further, according to the long wave net radiation, acquiring long wave downlink radiation. Through the method and the apparatus, no matter in a cloud condition or under a clear sky condition, the short wave radiation can be used to estimate long wave radiation and a technical problem that the long wave radiation can not be acquired from the remote sensing image in the cloud condition so that a long wave radiation space is not continuous in the prior art is solved.

Description

technical field [0001] The present application relates to the field of remote sensing technology, in particular, to a method and device for estimating long-wave net radiation and downlink radiation by using short-wave radiation. Background technique [0002] At present, the use of remote sensing images to obtain long-wave radiation (downward radiation and net radiation) is mainly concentrated in clear sky conditions, because the use of remote sensing images to retrieve long-wave radiation mainly relies on thermal infrared bands, but thermal infrared bands are difficult to penetrate clouds, resulting in the use of remote sensing images. The retrieved long-wave radiation is almost concentrated in clear-sky conditions, and the long-wave radiation under cloudy conditions cannot be directly obtained from remote sensing images, which leads to spatial discontinuity in the radiation products retrieved from optical remote sensing images, making it difficult to be adopted by models for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/02G01S7/48
CPCG01S7/4802G01S17/02
Inventor 王天星施建成阎广建陈玲焦中虎
Owner INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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