A novel spatio-temporal fusion method of evapotranspiration for SSEBOP evapotranspiration product

Although the Operational Simplified Surface Energy Balance (SSEBOP) has been successfully applied to mesoscale evapotranspiration (ET) monitoring, its spatial resolution (1000 m) is too coarse for local and regional water resource management in agricultural applications. Based on land surface temperature and Normalized Difference Vegetation Index, a novel spatio-temporal evapotranspiration fusion method considering underlying surface factors was proposed. The proposed evapotranspiration spatio-temporal fusion method was applied to the SSEBOP evapotranspiration product to obtain temporally continuous high spatial resolution 30-m ET data corresponding to the spatial resolution of the Landsat Satellite images. The middle reaches of the Heihe River Basin in China were selected for an experimental study. The accuracy difference between the fused 30-m ET and in situ measurements will be discussed here in detail. We will also discuss the differences in spatial distribution texture between the SSEBOP and spatio-temporal fusion ET results. Finally, the influence mechanism of underlying surface factors on evapotranspiration spatio-temporal fusion will be discussed.