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Method and system for quickly estimating surface albedo

A surface albedo and surface reflection technology, which is applied in the field of satellite passive remote sensing, can solve problems such as the inability to directly use the surface albedo database and limit the application of the surface albedo database

Active Publication Date: 2021-05-18
WUHAN UNIV
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Problems solved by technology

[0004] Channel differences limit the application of existing surface albedo databases
Although decades of satellite observations have accumulated a large amount of knowledge on surface albedo, with the development of satellite observation technology, more and more new observation channels have appeared, and the band division of channels has become more and more refined. These new technologies Neither can directly use the existing surface albedo database
Existing atmospheric passive remote sensing methods either use independent databases (they are surface albedo databases established for the channel parameters of each load), or can only convert between observation channels with similar parameters to obtain surface albedo on new channels Rate

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  • Method and system for quickly estimating surface albedo

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Embodiment Construction

[0027] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] A method for quickly estimating the surface albedo proposed in an embodiment of the present invention includes the process of establishing a channel conversion model and the process of estimating the surface albedo of a new channel. The establishment of the channel conversion model includes the spatiotemporal matching of the surface albedo data of the old and new channels and the training of the artificial neural network; the estimation of the surface albedo of the new channel is based on the trained artificial neural network, which quickly estimates the surface albedo on the new channel of the new satellite .

[0029] A) Build a channel switching model based on past satellite products

[0030] 1. Prepare the surface albedo products of old satellites in large areas for a long time (denoted as α 1 ) and the correspond...

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Abstract

The invention provides a method and system for quickly estimating surface albedo, and the method comprises a channel conversion model buildingprocess, including inputting an old channel surface albedo database, a surface albedo inversion result of a new satellite with a consistent space-time range and a corresponding solar zenith angle, converting the surface albedo, forming a new and old channel surface albedo mapping table based on a space-time nearest neighbor principle, constructing a multi-layer artificial neural network, and performing training according to the new and old channel surface albedo mapping table; a new channel surface albedo estimation process, including extracting the longitude and latitude of an observation target, the observation moment and the solar zenith angle during observation when atmospheric remote sensing is carried out based on new channel observation, searching an old channel database forthe surface albedo and the solar zenith angle of an old channel at the nearest distance and the nearest moment , and taking the surface albedo and the solar zenith angle as the input of an artificial neural network, obtaining the surface albedo corresponding to the new channel and according to the hypothesis of the surface reflection model, converting to the surface albedo corresponding to the solar zenith angle at the observation moment.

Description

technical field [0001] The invention relates to the technical field of satellite passive remote sensing, in particular to an estimation scheme of the surface albedo therein. Background technique [0002] Satellite passive remote sensing technology retrieves the characteristics of atmospheric molecules, aerosols, oceans or land surfaces by observing the solar radiation reflected by atmospheric molecules, aerosols, oceans or land surfaces. However, radiation observations from satellite payloads are a combination of scattering from atmospheric molecules, scattering from aerosols, and reflection from ocean or land surfaces. Therefore, accurate estimation of surface reflection is an important prerequisite for extracting atmospheric composition information from satellite observations, such as aerosol inversion, cloud attribute inversion, trace gas inversion, etc. Accurate surface albedo database has become one of the important supports for atmospheric passive remote sensing techn...

Claims

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Application Information

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IPC IPC(8): G06F30/27G06N3/08
CPCG06F30/27G06N3/084
Inventor 李四维杨洁
Owner WUHAN UNIV
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