The Normalized Difference Drought Index (NDDI) is a remote sensing tool that assesses drought severity by analyzing NIR and SWIR spectral bands. NDDI helps identify water stress in vegetation and guides decision-making for drought-related challenges. NDDI values typically range from -1 to 1. Negative values indicate drought stress, while positive values suggest healthy vegetation or wet conditions. The magnitude of the NDDI value can provide insights into the severity of drought conditions, with more negative values indicating more severe drought stress.

NDDI = (NDVI - NDWI) / (NDVI + NDWI)

Where NDVI = Normalized Difference Vegetation Index

NDWI = Normalized Difference Water Index

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