Аннотация:Drought is one of Thailand's most common catastrophes and causes a considerable amount of damage, especially to farming, in the northeast of the country.The objective of this study is to analyze vegetation drought variability from a vegetation phenology perspective using the vegetation condition index (VCI( from Terra/MODIS satellite data in the middle of the northeast region of Thailand .The MOD09A1 dataset from Terra/MODIS satellites was analyzed using the normalized difference vegetation index (NDVI(, and the results were analyzed with the VCI to examine vegetation drought variability in July, August, and September 2009-2019.The study found that in August 2013, the drought was most severe and accounted for 47.71% coverage (22,456 .76 km 2 (, and in September 2013, the drought was the least severe at 55.55% coverage ( 17,456 .42 km 2. ( Moreover, using simple linear regression analysis, the VCI results for each month of the 11-year period were used to find the statistical correlation with rainfall data from ground monitoring stations.It found that July, August, and September showed a coefficient of determination (r 2 (equal to 0.835, 0.834, and 0 .849, respectively .The r 2 value showed that this method was reliable.Furthermore, the analyzed VCI averages can be used as a very good indicator of drought in the middle of the northeast region of Thailand .
