Regression of in-water radiometric profile data

作     者：D'Alimonte, Davide Shybanov, Eugeny B. Zibordi, Giuseppe Kajiyama, Tamito 

作者机构：Univ Nova Lisboa Fac Ciencias & Tecnol Dept Informat Ctr Inteligencia Artificial Quinta Da Torre Caparica Portugal Ukrainian Natl Acad Sci Marine Hydrophys Inst Sevastopol Ukraine Commiss European Communities Joint Res Ctr Inst Environm & Sustainabil I-21020 Ispra Italy Univ Nova Lisboa Fac Ciencias & Tecnol Dept Informat Ctr Informat & Tecnol Informacao Quinta Da Torre Caparica Portugal 

出 版 物：《OPTICS EXPRESS》 (Opt. Express)

年 卷 期：2013年第21卷第23期

页      面：27707-27733页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：European Space Agency within the framework of the MERIS Validation Activities [12595/09/I-OL] "Faculdade de Ciencias e Tecnologia" of the "Universidade Nova de Lisboa" [21653/08/I-OL] Institute for Environment and Sustainability of the Joint Research Centre NATO Science for Peace and Security Program 

主　　题：Absorption coefficient Attenuation coefficient Computation methods Light focusing Radiative transfer Surface waves 

摘      要：This study addresses the regression of in-water radiometric profile data with the objective of investigating solutions to minimize uncertainties of derived products like subsurface radiance and irradiance (L-u0 and E-d0) and diffuse attenuation coefficients. Analyses are conducted using radiometric profiles generated through Monte Carlo simulations and field measurements. A nonlinear NL approach is presented as an alternative to the standard linear method LN. Results indicate that the LN method, relying on log-transformed data, tends to underestimate regression results with respect to NL operating on non-transformed data. The log-transformation is thus identified as the source of biases in data products. Observed differences between LN and NL regression results for Lu0 are of the order of 1-2%, that is well below the target uncertainty for data products from in situ measurements (i.e., 5%). For Ed0, instead, differences can easily exceed 5% as a result of more pronounced light focusing and defocusing effects due to wave perturbations. This work also remarks the importance of applying the multi-cast measurement scheme as a mean to increase the precision of data products. (C) 2013 Optical Society of America