Institute of Water Resources Planning;
Hanoi;
Vietnam;
Institute of Environment and Public Health;
Vietnam Union of Science and Technology Associations;
Hanoi;
Vietnam;
Thai Binh University;
Thai Binh;
Vietnam;
Faculty of Electronics and Telecommunications;
Electric Power University;
Hanoi;
Vietnam;
Spatio-Temporal Analysis of Drought; Standardized Precipitation Index (SPI); Drought Characteristics;