Normalized Difference Drought Index
(((N - R)/(N + R)) - ((G - N)/(G + N)))/(((N - R)/(N + R)) + ((G - N)/(G + N)))
N · R · G
vegetationvegetationSentinel-2Landsat-OLILandsat-TMLandsat-ETM+MODISPlanet-Fusion
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