Green Chromatic Index (GCI) also known as Green Chromatic Coordinate (GCC) is a measure of the greenness of vegetation. It is calculated from daily averaged RGB (Red, Green, Blue) composites values of digital images captured by PhenoCams.
Abisko Scientific Research Station (2022). Phenocam - Green Chromatic Coordinates (GCC) Composite Image Mean Values from Abisko Scientific Research Station, Mast 4.5m Phenocam 01, 2020-04-15–2020-11-30 [Data set]. Swedish Infrastructure for Ecosystem Science (SITES). https://hdl.handle.net/11676.1/G6MwljnPiokZGukLRxGyyTQd
