### Selecting reflectance math band

Posted:

**Mon May 23, 2022 2:32 pm America/New_York**Hello,

I want to improve the Chl a concentration data in the Southern Ocean, specifically Drake Passage.

I found this algorithm Chl=exp10(0.3205-2.9139R+8.7428R2-16.1811R3+9.0051R4)

R=log10(Rrs(443/555)>Rrs(490/555)>Rrs(510/555))

for Globcolour data. In this paper https://doi.org/10.1002/jgrc.20270

I trying to use math band to select greatest reflectance proportion, however my programing knowledge is very limited

Tried something like: if log10(443/555)>log10(490/555)>log10(510/555) then log10(443/555) else log10(490/555)>log10(510/555).

Or maybe I can do it separately and see which one is greatest.

Some one can give me a hint?

Thanks,

I want to improve the Chl a concentration data in the Southern Ocean, specifically Drake Passage.

I found this algorithm Chl=exp10(0.3205-2.9139R+8.7428R2-16.1811R3+9.0051R4)

R=log10(Rrs(443/555)>Rrs(490/555)>Rrs(510/555))

for Globcolour data. In this paper https://doi.org/10.1002/jgrc.20270

I trying to use math band to select greatest reflectance proportion, however my programing knowledge is very limited

Tried something like: if log10(443/555)>log10(490/555)>log10(510/555) then log10(443/555) else log10(490/555)>log10(510/555).

Or maybe I can do it separately and see which one is greatest.

Some one can give me a hint?

Thanks,