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This function can be used to computed the normalized difference index for any combination of bands with support for masking saturated and negative reflectance pixels, and allow the user to set a water mask so that negative or low reflectance pixels can be set to a different output value (e.g. -1 instead of 0). The original NDVI function now calls this function but with the correct band names.
…th real scene values The other functions in the file still need to be updated or this file may end up getting removed since it seems like the interpolation is operating correctly.
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Added a generic normalized difference function that can be used for NDWI, NDVI, etc with consistent support for adjusting negative/low and saturated reflectance values with water masking.
Switched from a patch update to a full minor version update since new functions are being added.