Geographia Technica, Vol 18, Issue 2, 2023, pp. 123-131


Phaisarn JEEFOO

DOI: 10.21163/GT_2023.182.09

ABSTRACT: One of the main natural disasters that has an impact on the environment and economy of nations throughout the world is drought. It has an impact on the local vegetation's state. The study's main goal was to look for years of severe drought by looking at Thailand's Eastern Economic Corridor (EEC). To determine the vegetation condition in the research area between 2017 and 2021, the Normalized Vegetation Index (NDVI) from Terra/MODIS data was employed. The area with the NDVI difference from the average value of NDVI during the same time period was examined using the Standardized Vegetation Index (SVI). Through the vegetation index, the drought can be reflected in this. According to the study, the highest drought area covered an area of 216.36 km2 in 2017. This was followed by years 2019 and 2020, which each covered an area of 212.65 km2, 211.23 km2, 197.09 km2, and 178.07 km2. Additionally, a statistical analysis of the monthly correlation between the SVI (independent variable) and rainfall (dependent variable) over the course of the five years revealed that the coefficient of determination R2 was 0.8018 in 2020, 0.6819 in 2021, 0.6262 in 2017, 0.5772 in 2018, and 0.5108 in 2019. The methodology can be obtained and used by other departments to assess and forecast drought in other regions of Thailand and other nations.

Keywords: Drought, Terra/MODIS, NDVI, SVI, Thai Eastern Economic Corridor

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