Farmland evapotranspiration estimation method and system

A farmland and evapotranspiration technology, which is applied in the field of farmland evapotranspiration estimation methods and systems, can solve the problems of reducing the accuracy and reliability of evapotranspiration estimation results, and achieve the effects of strong reliability, high spatial resolution, and clear physical basis

Inactive Publication Date: 2018-01-30
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

[0004] However, the existing technology of farmland evapotranspiration algorithm is greatly affected by meteorological data and vegetation index, so in low vegetation areas or non-growing seasons, the evapotranspiration estimation results will be relatively smooth, reducing the accuracy and reliability of the evapotranspiration estimation results

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  • Farmland evapotranspiration estimation method and system
  • Farmland evapotranspiration estimation method and system
  • Farmland evapotranspiration estimation method and system

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[0047] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0048] figure 1 It is a flowchart of a method for estimating farmland evapotranspiration provided by an embodiment of the present invention, as shown in figure 1 shown, including:

[0049] S1. Obtain remote sensing image data and meteorological data of farmland;

[0050] S2. Calculate latent heat flux, net radiation flux and soil heat flux based on the remote sensing image data and meteorological data of the farmland;

[0051] S3. Estimate an evapotranspiration value based on the latent heat flux, the net radiant flux, and the soil heat flux.

[0052] In S1, the remote sensing image data of the farmland is satellite remote sensing data. Preferably, the embodiment of th...

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Abstract

The invention provides a farmland evapotranspiration estimation method and system. The farmland evapotranspiration estimation method comprises S1, obtaining remote sensing image data and meteorological data of farmland; S2, calculating latent heat flux, net radiation flux and soil heat flux based on the remote sensing image data and the meteorological data of the farmland; and S3, estimating the evapotranspiration value based on the latent heat flux, the net radiation flux and the soil heat flux. With respect to the farmland evapotranspiration estimation method and system, by fully combining the meteorological data, optical remote sensing and thermal infrared remote sensing, the physical basis is clear, the spatial resolution is high, and the reliability of the estimation result is higher.

Description

technical field [0001] The invention relates to the technical field of hydrometeorology, and more specifically, to a method and system for estimating farmland evapotranspiration. Background technique [0002] Evapotranspiration includes surface water evaporation, vegetation interception evaporation and vegetation transpiration. Evapotranspiration connects the hydrosphere, atmosphere, and biosphere, and is an important part of surface water balance and energy balance. It plays an important role in agricultural water resource management, crop yield estimation, and drought monitoring. Farmland evapotranspiration is the evapotranspiration that occurs on the surface of farmland. Therefore, real-time monitoring of farmland evapotranspiration, especially the research on farmland evapotranspiration algorithm based on remote sensing information, has important scientific significance and practical guiding value for rational management of water resources and drought prevention and reli...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/02
Inventor 姚云军余健王轩宇张立林徐佳
Owner BEIJING NORMAL UNIVERSITY
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