2. Data processing: The topographic map of Thailand in scale 1:250,000 as a base map in this study. All the average every 4-years monthly values of drought severity in various levels would be placed on corresponding to a location of each met. station throughout Thailand and then, a “Grid Cell Kriging interpolation technique” of GIS spatial analysis would have been used to analyze all related data.
3. Output: The grid cell digital maps of Palmer meteorological drought indices throughout Thailand in scale 1:250,000 showing the colorful severity of drought in various levels from –4.00 or less (Extreme drought) to 4.00 or more (Very much wetter than normal) as follow;
Remarks: