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twei55/fdi-advanced-eo-browser.js

Last active March 15, 2023 10:52
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Custom script to calculate FDI (Floating Debris Index) in EO-Browser (Advanced version)
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fdi-advanced-eo-browser.js
/*
Calculation of Floating Debris Index (FDI)
For more information see https://www.nature.com/articles/s41598-020-62298-z
*/
// S-2A Central Wavelength (nm)
const waveLengthRed = 664.6
const waveLengthNIR = 832.8
const waveLengthSWIR = 1613.7
const FDI = B08 - (B06 + (B11 - B06) * ((waveLengthNIR - waveLengthRed)/(waveLengthSWIR - waveLengthRed)) * 10)
// https://docs.sentinel-hub.com/api/latest/evalscript/functions/#index
// Calculate difference divided by sum
const NDVI = index(B08, B04)
const FDIMask = 0.02 > FDI < 0.07
const NDVIMask = 0.01 > NDVI < 0.25
return [FDIMask * NDVIMask]
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