How does the FLH/MCI Processor calculate the 'slope' index?

Optical Toolbox
#1

When I process OLCI L1b data with SNAP ‘Optical/Thematic Water Processing/ FLH\MCI Processor’, apart from the FLH or MCI images, I have noticed that a ‘slope’ image is also generated, I suppose this file might contain additional information about chlorophyll-a or phytoplankton retrieval. But not technical documents or Help in SNAP have explained this index. I idewntified several pixels in a lake in my study area, and the ‘slope’ value is negative

envi_plot.png873×280 17 KB

Can anyone show me more detailed technical guidance?Thanks.

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#2

The slope gives you simply the slope between the lower and the upper band.
it is computed as follows:
(upper_radiance - lower_radiance) * (upper_wavelength - lower_wavelength)

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