Regional earth surface sensible heat/latent heat flux inversion method and system based on remote sensing data

Abstract

The invention discloses a regional earth surface sensible heat / latent heat flux inversion method based on remote sensing data. The method comprises the following steps that a research area and the remote sensing data are determined; remote sensing earth surface and regional meteorological parameters are prepared according to the remote sensing data, wherein the remote sensing earth surface parameters comprise a normalized difference vegetation index NDVI, vegetation coverage f, albedo, earth surface emissivity Emiss, earth surface temperature Ts and a leaf area index LAI, and the regional meteorological parameters comprise air temperature Ta and relative humidity RH; net radiation flux Rn inversion is conducted according to the remote sensing earth surface and regional meteorological parameters; soil heat flux G inversion is conducted according to the leaf area index LAI, the air temperature Ta and net radiation flux Rn; radiation-convection impedance rae inversion is conducted according to theoretical two-dimensional space of the net radiation flux Rn, soil heat flux G, the vegetation coverage f and the earth surface temperature Ts and a temperature profile equation estimated through sensible heat flux; regional earth surface sensible heat H / latent heat LE flux inversion is achieved according to radiation-convection impedance rae.

Description

technical field [0001] The invention relates to an inversion method and system for regional surface sensible / latent heat flux. More specifically, it relates to a method and system for inversion of regional surface sensible / latent heat flux based on remote sensing data. Background technique [0002] The inversion of regional surface sensible / latent heat flux is the basis for water resource management in watersheds, crop irrigation system formulation, agricultural water use efficiency evaluation, regional drought monitoring, agricultural water conservation and other application fields, and it is also the basis for building the soil-vegetation-atmosphere continuum Energy and water migration conversion, the premise of land-atmosphere coupling simulation research. The inversion results of regional surface sensible / latent heat flux can provide water conservancy, agriculture, and forestry professionals with important information on the condition of the underlying surface, and prov...

AI Technical Summary

Problems solved by technology

[0006] At present, the surface sensible / latent heat flux model method based on remote sensing still has a large uncertainty. Among the existing model methods, there is still no one that can effectively solve the problem of data-free areas and complex non-uniform underlying surfaces. Sensible / Latent Heat Flux Estimation Problem

In particular, the lack of effective observation methods for surface sensible / latent heat fluxes in data-free areas and complex non-uniform underlying surfaces is a difficulty in current research and practical applications.

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