Add Normalized Difference Gamma-Radiation Index (NDGRI) - #373
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Add NDGRI Sentinel-2 evalscript
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Description
This pull request adds the Normalized Difference Gamma-Radiation Index (NDGRI), a Sentinel-2 spectral index developed for screening areas associated with elevated gamma radiation in arid and semi-arid environments.
NDGRI is calculated from Sentinel-2 B04 and B12:
NDGRI = (B04 - B12) / (B04 + B12)
The contribution includes:
The script has been tested in Copernicus Browser using the Sentinel-2 Level-2A scenes used in the published study.
Reference
Simić, M.; Vakanjac, B.; Drobnjak, S. (2025).
NDGRI: A Novel Sentinel-2 Normalized Difference Gamma-Radiation Index for Pixel-Level Detection of Elevated Gamma Radiation.
Remote Sensing, 17, 3331.
https://doi.org/10.3390/rs17193331