Investigating the Optimal Spatial Resolution for Assimilating GNSS PWV Into an NWP System to Improve the Accuracy of Humidity Field. - Haobo Li 001; Suelynn Choy; Xiaoming Wang 006; Hong Liang; Smrati Purwar; Kefei Zhang (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2023)