2. To compute the severity of Palmer meteorological drought indices in each meteorological station throughout Thailand in various levels from –4.00 or less (Extreme drought) to 4.00 or more (Very much wetter than normal) using Palmer’s classification.
3. To interpolate and extend the severity of Palmer meteorological drought
indices from 2 to other areas without meteorological station using GIS spatial analysis “Kriging techniques” in form of grid cell digital maps of Thailand in scale 1:250,000 showing the severity of Palmer meteorological drought indices throughout Thailand.