On the interchangeability of Landsat and MODIS data in the CMRSET actual evapotranspiration model – Comment on “Monitoring irrigation using Landsat observations and climate data over regional scales in the Murray-Darling Basin” by David Bretreger, In-Young Yeo, Greg Hancock and Garry Willgoose

•We demonstrate flaws in the CMRSET implementation in Bretreger et al. (2020).•Actual evapotranspiration biases were because they used an incorrect Landsat band.•The calculation of GVMI should have used Landsat SWIR1 band instead of SWIR2.•CMRSET’s suitability for irrigation monitoring is demonstrated via new experiments.•CMRSET evapotranspiration using the correct SWIR1 band did not show large biases.