Thai Government [20], while the Malaysia land use data comes from the database of the European Commission Global Environment Monitoring (GEM) Program [23]. Both the Thailand and Malaysia land use mapping data are reclassified in ArcGIS with the Anemoscope vegetation cover classification index which is converted into corresponding roughness values during the simulations.The land use data is then merged into one large raster file with 90 m by 90 m pixels encompassing the entire region studied. Table 1 shows the Anemoscope vegetation cover classification index and the corresponding roughness height, as used in the computation of the wind resource maps.