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作为定量描述地表异质性和时空分布规律的主要方法,遥感需要与模型相结合,才能对陆表蒸散进行估算。ETWatch是面向流域规划与管理和农业水管理的实用需求,针对遥感应用而设计的遥感蒸散监测系统,可用于计算流域地表净辐射、感热、潜热(ET)的空间分布及其时间过程,提高ETWatch模型的精度和可靠性的关键在于发展多源遥感数据的参数化方法。本文在调研国内外研究进展的基础上,总结了流域蒸散遥感估算参数化中存在的主要问题,包括非均匀下垫面参数获取、时空尺度转换、多源遥感数据集成、真实性检验与模型校正等,并结合上述问题介绍了ETWatch中的模型与方法。
As the main method to quantitatively describe the heterogeneity of the surface and the spatial and temporal distribution, the remote sensing needs to be combined with the model to estimate the surface evapotranspiration. ETWatch is a practical monitoring system for watershed planning and management and agricultural water management. Remote sensing evapotranspiration monitoring system designed for remote sensing applications can be used to calculate the spatial distribution and time course of net radiation, sensible heat and latent heat (ET) The key to the accuracy and reliability of the ETWatch model lies in the parametric method of developing multi-source remote sensing data. Based on the research progress at home and abroad, this paper summarizes the main problems in the parameterization of evapotranspiration estimation in the basin, including the acquisition of non-uniform underlying surface parameters, time-space scale conversion, multi-source remote sensing data integration, authenticity test and model calibration Etc., combined with the above problems introduced ETWatch in the model and method.