NDTI (Lacaux et al., 2006)

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Normalized Difference Turbidity Index (NDTI) : NDTI = (R-G)/(R+G)

Reference: J-P. Lacaux, Y. M. Tourre, C. Vignolle, J-A. Ndione, and M. Lafaye, "Classification of Ponds from High-Spatial Resolution Remote Sensing: Application to Rift Valley Fever Epidemics in Senegal," Remote Sensing of Environment 106 66–74, Elsevier Publishers: 2007