Normalized Difference Chlorophyll Index

Show script or download it.

            /*
Normalized difference chlorophyl index
https://pdfs.semanticscholar.org/2fba/caa14adb43d5bc8d2dd274304f60814d933c.pdf
https://www.sciencedirect.com/science/article/pii/S0380133018301801 
https://www.researchgate.net/publication/297718964_Comparison_of_satellite_reflectance_algorithms_for_estimating_chlorophyll-a_in_a_temperate_reservoir_using_coincident_hyperspectral_aircraft_imagery_and_dense_coincident_surface_observations 
*/

//white color represents pixels with no data
if ((B05+B04)==0){ 
  return [1,1,1]
};
var val = (B05-B04)/(B05+B04);

return colorBlend
(
  val,
  [-0.5,0,0.1,0.2,0.3,1],
  [
   [0,0,1],
   [0,0.5,0.5],
   [1,0.3,0],
   [1,1,0],
   [0.2,0.8,0],
   [0,0.5,0]
  ]
);

Evaluate and visualize

• EO Browser
• SH Playground

General description of the script

NDCI is an index that aims to predict the plant chlorophyll content. It is calculated using the red spectral band B04 with the red edge spectral band B05.

Description of representative images

Visualization of the NDCI index above Rome.

References

• Normalized difference chlorophyll index: A novel model for remote estimation of chlorophyll-a concentration in turbid productive waters
• A spectral space partition guided ensemble method for retrieving chlorophyll-a concentration in inland waters from Sentinel-2A satellite imagery
• Comparison of satellite reflectance algorithms for estimating chlorophyll-a in a temperate reservoir using coincident hyperspectral aircraft imagery and dense coincident surface observations