CHL-RED-EDGE (Chlorophyll Red-Edge)

//
// Chlorophyll Red-Edge  (abbrv. Chlred-edge)
//
// General formula: (NIR/RE)-1
//
// doi: 10.1078/0176-1617-00887
//

let index = (B07 / B05) - 1;

return colorBlend(index, [0, 1, 2.5, 5, 10, 20],
  [
    [0, 0, 0],
    [0, 0.5, 0],
    [0.2, 0.8, 0],
    [1, 1, 0],
    [0.8, 0.8, 0.8],
    [1, 1, 1]
  ]);

Evaluate and Visualize

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The index is based on Gitelson et al. 2003.

It is defined as:

\[ChlRe = \frac{NIR}{RE}-1.\]

Representative Images

Chlorophyl red edge above Slovenia and Croatia, on 9.7.2020.

rededge