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by tudorw 3128 days ago
here's a paper looking at which indexes work with corn, wheat and irrigation water, it's very likely each crop will have an index that is more accurate;

"The following spectral indices were examined: Difference Vegetation Index (DVI), Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Difference Water Index (DWI), Normalized Difference Water Index (NDWI), Difference Drought Index (DDI) and Normalized Difference Drought Index (NDDI). "

https://www.degruyter.com/downloadpdf/j/jengeo.2015.8.issue-...