R.P. Souto, V.C.F. Barbosa, H.F. de Campos Velho, S. Stephany (2007): Determining Chlorophill Concentration in Off-shore Sea Water from Multi-spectral Radiances by Using Second Devirtive Criterion and Ant Colony Meta-Heuristic, Inverse Problems, Desing and Optimization Symposium IPDO-2007, April 16-18, Miami (FL), USA.

Abstract: An inverse hydrologic optics problem is solved using a proposed curve concavity criterion in order to reconstruct Chlorophyll concentration profile from synthetic water-leaving radiance experimental measurements in the ocean water, for 10 wavelengths (multi-spectral approach) and 10 upward polar directions. The inverse problem is formulated as an optimization problem and iteratively solved by the meta-heuristics Ant Colony Optimization (ACO), using the radiative transfer equation as direct model, solved using the Laplace transform discrete ordinate (LTSN) method. An objective function is given by the square difference between computed and experimental radiances at every iteration. A good agreement is reached with the reference gaussian profile of Chlorophyll concentration.