Abstract
In this study, the authors analyzed the relationship between the NDVI, NDWI, NDDI indexes and drought condition of Dak Nong province. Landsat images data in dry season from 2005-2019 quickly collected, pre-processed and calculated on Google Earth Engine. The results showed that NDWI and NDDI are more sensitive indicatior for drought than NDVI. In which, NDDI value > 0.8 and NDWI <0.1 are areas with slight drought. The higher the NDDI index, the higher the ability of a drought phenomenon. Therefore, this NDDI can be used as an indicator for drought monitoring for Dak Nong province during the dry season.
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