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Method for evaluating daytime average evapotranspiration according to multi-temporal remote sensing data and meteorological data

A technology for remote sensing data and meteorological data, which is applied in the field of quantitative remote sensing and can solve problems such as inability to obtain direct access.

Active Publication Date: 2016-08-31
INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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Problems solved by technology

However, most of the current remote sensing evapotranspiration models use a single time-phase data of polar orbiting satellites to estimate evapotranspiration, and can only obtain 1-2 effective observations during the day, and cannot directly obtain daily-scale average evapotranspiration. More urgently needed data; only instantaneous ET data can be obtained directly, but in hydrology and water resources management applications, daily-scale ET information is more practical

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  • Method for evaluating daytime average evapotranspiration according to multi-temporal remote sensing data and meteorological data
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  • Method for evaluating daytime average evapotranspiration according to multi-temporal remote sensing data and meteorological data

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[0030] The implementation of the present application will be described in detail below with reference to the accompanying drawings and examples, so as to fully understand and implement the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects.

[0031] The present invention provides a method for estimating daytime average evapotranspiration by combining multi-temporal remote sensing data and meteorological data, such as figure 1 shown, including the following steps:

[0032] 1) Calculate the remote sensing parameters through the surface temperature LST and the surface shortwave net radiation NSSR;

[0033] The data source of the present invention comes from my country's Fengyun series static meteorological satellite (FY-2), and the calculation process of parameter is as follows:

[0034] 1.1) Inversion of surface temperature

[0035] Extract the brightness temperature of the two thermal infrared c...

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Abstract

The invention discloses a method for evaluating daytime average evapotranspiration according to multi-temporal remote sensing data and meteorological data. The method comprises the following steps of calculating a remote sensing ellipse parameter through a land surface temperature (LST) and a net surface shortwave radiation (NSSR), calculating evapotranspiration model coefficients n0-n5 by means of ALEX model analog data; and estimating a daytime average evapotranspiration ETd by means of the remote sensing ellipse parameter and the evapotranspiration model coefficients n0-n5. According to the method of the invention, a multi-temporal earth observation advantage of a stationary meteorological satellite is sufficiently utilized. Through multi-temporal satellite data and meteorological data, the daytime average evapotranspiration is directly obtained. The method settles a problem that the daytime average evapotranspiration can be obtained through inversing instantaneous evapotranspiration and performing time scale expansion in prior art, and furthermore realizes direct estimation for the daytime average evapotranspiration based on FY-2 stationary meteorological satellite data.

Description

technical field [0001] The application belongs to the field of quantitative remote sensing, in particular, it relates to a method for estimating daytime average evapotranspiration by combining multi-temporal remote sensing data and meteorological data. Background technique [0002] Evapotranspiration is an important part of the water cycle and surface energy balance, and plays a key role in the land surface soil-vegetation-atmosphere system. More importantly, evapotranspiration is also a key parameter in the fields of regional scale agriculture, climate, hydrology and ecology, and plays an important role in the research of regional and even global agricultural production, climate change and hydrology and water resources. It can be said that evapotranspiration is closely related to human production and life. [0003] The existing evapotranspiration acquisition methods are mainly divided into traditional surface observation methods and remote sensing inversion methods. Among...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06F17/50
CPCG06F30/367G06Q10/04
Inventor 冷佩李召良宋小宁段四波
Owner INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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