Building drought classification map with landsat 8 image data in Bac Binh district, Binh Thuan province

Abstract

Vietnam experiences increasing droughts throughout the dry season due to climate change, global warming,and human-caused activities like urbanization and deforestation. Drought hazard significantly impacts socioeconomic, agriculture, and the environment; it directly threatens human lives, livelihoods, food security, and environmental degradation. It is essential to have a drought assessment map to assist in developing and implementing strategies to combat drought. Space remote sensing technology development has enabled efficient and cost-effective monitoring and evaluation of droughts on a large scale, surpassing the capabilities of ground-based observations. This research uses remote sensing technology to monitor and assess the severity of the drought in the Bac Binh district, Binh Thuan province. We analyzed the Temperature Vegetation Dryness Index (TVDI) using multi-temporal Landsat 8 satellite data for the severe drought events in 2014, 2017, and 2020. The results indicate a significant increase in the percentage of land area affected by drought, from 50.74% in 2014 to 66.23% in 2020. The obtained maps provide valuable visual data to relevant agencies, assisting with planning preventative measures and mitigating future drought risks.