Spatial and temporal scale matching method and device for land surface evapotranspiration remote sensing estimation

Abstract

The invention provides a spatial and temporal scale matching method and device for land surface evapotranspiration remote sensing estimation. The method comprises the steps of: S1: acquiring a remote sensing data set with multiple spatial resolutions and multiple temporal resolutions; S2: according to the acquired remote sensing data set, carrying out spatial and temporal data fusion to obtain a remote sensing data set which simultaneously has a high temporal resolution and a high spatial resolution; S3: carrying out ET parametric inversion on the data set generated in the steps S1 and S2 by utilizing a preset data model so as to obtain a remote sensing parameter set with different temporal and spatial resolutions; S4: according to remote sensing parameters with different temporal and spatial resolutions, which are acquired in the step S3, respectively carrying out spatial and temporal scale matching judgment; and if a spatial scale matching judgment result and a temporal scale matching judgment result meet the accuracy requirement of ET estimation, using remote sensing data in the step S4, which meets the accuracy requirement of ET estimation, as a matched data set. The spatial and temporal scale matching method and device provided by the invention can solve the problem of uncertainty of ET inversion, which is caused by temporal and spatial scale matching uncertainty in existing ET estimation.

Description

technical field [0001] The invention relates to the scientific fields of remote sensing and ecohydrology, in particular to a method and device for matching time and space scales of land surface evapotranspiration remote sensing estimation. Background technique [0002] Estimating evapotranspiration (ET) through remote sensing parameter inversion and model coupling simulation is a commonly used method at present. Compared with traditional hydrological models, remote sensing ET models have obvious advantages in accuracy and space. However, its discreteness in time, heterogeneity of the underlying surface and comprehensiveness of spectral information limit its continuous hydrological observation. Therefore, "time" and "space" matching is one of the key issues to reduce the uncertainty of ET inversion and improve the applicability. [0003] However, due to the limitation of a single sensor, it is difficult to take into account different temporal and spatial scale matching studi...

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Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the present invention provides a time-space scale matching method and device for land surface evapotranspiration remote sensing estimation to solve the ET inversion uncertainty caused by the inability to take into account both time and space scale matching in the prior art The problem

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