Interactive comment on “SWAT-CUP for Calibration of Spatially Distributed Hydrological Processes and Ecosystem Services in a Vietnamese River Basin Using Remote Sensing” by

The manuscript undertakes a calibration of SWAT with the SUFI-2 procedure using remote sensing data from precipitation, ET and LAI at the HRU level for the Day Basin in Vietnam. The paper anticipates that this method is better for the quantification of ecohydrological processes in un-gauged basins. Generally, while the authors use a novel and interesting method, they confuse the terminology between SWAT CUP and SUFI-2. As well, an ensemble of ET products was applied, and often unclear or vague process descriptions are provided (i.e. for SUFI calibration and in the results). Therefore, for these and the reasons listed below, my recommendation for this manuscript is “major revisions”.