Validation of the Surface Daytime Net Radiation Product From Version 4.0 GLASS Product Suite

The daytime surface net radiation (R _n ) product from version 4.0 Global LAnd Surface Satellite (GLASS) product suite was recently generated from Moderate Resolution Imaging Spectroradiometer data. It is the daytime average product of R _n derived from 2000 to 2015 at a spatial resolution of 0.05°. This letter describes the results of validation of this new Rn product using ground measurements collected from 142 sites distributed worldwide. The overall accuracy of the GLASS daytime R _n product was satisfactory, with an R ² of 0.80, root-mean-square error of 51.35 Wm ^-2 , and mean bias error of 0.11 Wm ^-2 . Its accuracy and quality were highly consistent for different land cover classes and elevation zones.