In O25 (O23) for BRDF correction, the underwater rrs is calculated lines 133-136 in brdf_model_O23.py in order to derive a0 through chi. However, in O25, a0 is directly calculated from above-surface Rrs. This also removes the need to calculate rrs altogether.
Practical changes will be minimal, as rrs and Rrs are quasi-proportional, and chi is based on band ratios.
Regards,
Jaime.
In O25 (O23) for BRDF correction, the underwater rrs is calculated lines 133-136 in brdf_model_O23.py in order to derive a0 through chi. However, in O25, a0 is directly calculated from above-surface Rrs. This also removes the need to calculate rrs altogether.
Practical changes will be minimal, as rrs and Rrs are quasi-proportional, and chi is based on band ratios.
Regards,
Jaime.