L2-WFR chl data

Optical Toolbox
1

Hi All
While reading pixel info in SNAP for L2-WFR data (CHL_NN and CHL_OC4ME), it gives directly chlorophyll value in (mg/m^3) or it is log base 10 transformed data. Do we have to calculate actual chlorophyll by taking CHL_NN on 10 raise to the power (i.e. 10^CHL_NN) for getting actual pixel value. Since in meta data CHL_NN is written as log transformed and a scaling factor (0.0157…) is also given.
Please guide me to retrieve the correct pixel value for retrieving CHL_NN.

2

@TomBlock can you help?

3

Dear arvindsahay,

SNAP detects the log scaled data and transforms to geophysical values, i.e. applies the inverse log to the raw data. If you check the properties of CHL_NN, it says units are unscaled (mg.m-3).

With best regards,
Tom