Life Odyssey

Chla retrieval

1 min

A note for Chla algorithm.

Chla Algorithms Review

NameFormulaReferenceWater type
OClog10(Chl)=a0+a1X+a2X2+a3X3+a4X4,X=log10(Rrs(λb)Rrs(λg))log_{10}(Chl)=a_0+a_1X+a_2X^2+a_3X^3+a_4X^4,X=log_{10}(\frac{Rrs_(\lambda_b)}{Rrs_(\lambda_g)})(Example)O’Reilly 2019Clear
OCI![image-00030312152124019](/Users/zhenjia/Library/Application Support/typora-user-images/image-00030312152124019.png)Wang 2016;Hu 2011Coastal
Band rationRrs(751)/Rrs(672)Rrs(751)/Rrs(672)Gurlin 2011Coastal
Tang/Tassan![image-00030312152233703](/Users/zhenjia/Library/Application Support/typora-user-images/image-00030312152233703.png)Tang 2004;Tassan,1994;Sun 2010Coastal
Gitelson![image-00030312152341386](/Users/zhenjia/Library/Application Support/typora-user-images/image-00030312152341386.png)Gitelson 2008Coastal
RLHRrs(672)-Rrs(555)-{[Rrs(751)-Rrs(555)] × [(672-555)/(751-555)]}Schalles,1998Coastal
RDR[Rrs(555)-Rrs(488)]/[Rrs(555) + Rrs(488)]Gitelson,1993Coastal
NDCI[Rrs(751)-Rrs(672)]/[Rrs(751) + Rrs(672)]Mishra, 2012Coastal
SCIHChla = {Rrs(751) + (751-672)/(751-555) × [Rrs(555)-Rrs(751)]}-Rrs(672), H∆ = Rrs(555)-{Rrs(751) + (751-555)/(751-488) × [Rrs(488)-Rrs(751)]}, SCI = HChla-H∆Shen, 2010Coastal
ASA![image-00030312152813412](/Users/zhenjia/Library/Application Support/typora-user-images/image-00030312152813412.png)Jiang, 2020Coastal
TC2![image-00030312152928782](/Users/zhenjia/Library/Application Support/typora-user-images/image-00030312152928782.png)Liu,2020Coastal, inversion based
NIR-Red![image-00030312153111284](/Users/zhenjia/Library/Application Support/typora-user-images/image-00030312153111284.png)Gons,2005Cosatal
MDNNNPahlevan 2020Hyperspectral,Coastal
OWT![image-00030312153858028](/Users/zhenjia/Library/Application Support/typora-user-images/image-00030312153858028.png)Neil, 2019Coastal

There are a lot of Chla algorithm.

Possibly, it is almost out of date.

Just JO I think hhh.

An interesting paper

Progressive scheme for blending empirical ocean color retrievals of absorption coefficient and chlorophyll concentration from open oceans to highly turbid waters

Former Classification scheme is based on value or shape. It is a hard transaction, not smoothly.

One way is use fuzzy c-mean, given隶属度(MD，这还是这么久了我第一次见到不会用英语的专业名词).But it is statistically based, don’t have any implicit physics.

This is a paper have implicit physics.

Ocean Color Chla Algorithm