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A Rapid Determination Method of Cloud Reflectance Applicable to Oxygen a-band

A determination method and cloud reflection technology, applied in the field of passive remote sensing of satellites, can solve the problems of data processing congestion, high cost, large data volume, etc., and achieve the effect of reducing computing pressure, reducing cost, and speeding up

Active Publication Date: 2021-01-26
WUHAN UNIV
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Problems solved by technology

The main disadvantages are: the cost of satellite launch is expensive, the amount of daily observed data is large, and the calculation of the radiation transfer model is large, and the processing of a single data takes a long time, resulting in data processing congestion. Some data may eventually be discarded and only prioritized. Part of the data is lost, which reduces the utilization rate of satellite observations, increases the cost of a single observation, and causes waste

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  • A Rapid Determination Method of Cloud Reflectance Applicable to Oxygen a-band
  • A Rapid Determination Method of Cloud Reflectance Applicable to Oxygen a-band
  • A Rapid Determination Method of Cloud Reflectance Applicable to Oxygen a-band

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0026] Such as figure 1 As shown, a method for quickly determining the cloud reflectance suitable for the oxygen A zone includes the following steps:

[0027] 1. Obtain the solar zenith angle θ during satellite observation. The solar zenith angle during satellite observation is determined according to the orbit and observation time.

[0028] 2. Set the cloud attributes needed to calculate the cloud reflectance, including the cloud optical thickness τ c , cloud top height h top and cloud base height h base .

[0029] The cloud attribute values ​​come from the statistics of real clouds and are adjusted according to the ...

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Abstract

The invention discloses a method for quickly determining the cloud reflectance applicable to the oxygen A zone, the method comprising the following steps: 1) obtaining the solar zenith angle θ during satellite observation; 2) setting the cloud attributes required for calculating the cloud reflectance, Including cloud optical thickness, cloud top height and cloud base height; 3) divide the spectral range of the oxygen A band to be calculated into multiple wavelength sequences; 4) calculate the cloud reflectance wavelength by wavelength for the divided wavelength sequences; 5) divide The calculated reflectances of clouds are arranged in ascending order of their corresponding wavelengths. The invention proposes a simplified calculation model of the cloud reflectance, and calculates the reflection of the cloud layer on each spectrum. The time-consuming calculation of cloud reflectance is shortened, the calculation pressure is reduced, the speed of single data processing is accelerated, and the cost of single satellite data is reduced.

Description

technical field [0001] The invention relates to satellite passive remote sensing technology, in particular to a method for rapidly determining cloud reflectance suitable for oxygen A zone. Background technique [0002] The transmission of solar radiation in the atmosphere is regular, which is reflected in the absorption and reflection of solar radiation by gases, clouds and smoke in the atmosphere. Cloud reflectance is the ability of clouds to reflect solar radiation, and its strength is mainly determined by attributes such as water content and distribution height in clouds. Therefore, it is applied in satellite passive cloud remote sensing technology to establish the correlation between reflectance and cloud properties through the radiative transfer model, and infer cloud properties from the observed cloud reflection radiation. Relying on satellite global observations can obtain cloud attribute data covering a wide range, which is helpful for scientific research on water c...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 李四维杨洁
Owner WUHAN UNIV
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