CHL-RED-EDGE (Chlorophyll Red-Edge)

//
// Chlorophyll Red-Edge  (abbrv. Chlred-edge)
//
// General formula: ([760:800]/[690:720])^(-1)
//
// URL https://www.indexdatabase.de/db/si-single.php?sensor_id=96&rsindex_id=252
//

let index = Math.pow((B07 / B05), (-1.0));

return colorBlend(index, [0, 0.2, 0.5, 0.7, 1, 5],
[
  [0,0,0],
  [0,0.5,0],
  [0.2,0.8,0],
  [1,1,0],
  [0.8,0.8,0.8],
  [1,1,1]
]);