Three-dimensional modeling of inland waters optical properties from aerial hyperspectral images

• Autor(a) principal: Carmo, Alisson Fernando Coelho do [UNESP]
• Data de Publicação: 2019
• Tipo de documento: Tese
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/191338
• topic: Three-dimensional bio-optical model; Optical Properties; Vertical distribution of light; Inland Water; Modelo bio-óptico tridimensional; Propriedades ópticas; Distribuição vertical da luz; Águas Interiores

The acquisition of data using Remote Sensing and in-situ sampling allows several data sources to be integrated for the analysis and observations of environmental characteristics and may require computational methods to support the data processing, exploration and analysis. The need to integrate data from different sources is highlighted in studies of dynamic and complex environments that frequently change, such as hydroelectric reservoirs. Reservoirs are artificial ecosystems, which influence directly the regional characteristics, mainly because of their multipurpose use. The interactions of the electromagnetic energy with the optically active components occur along the entire water column, so that the behavior of the light field reflects the changes applied along the entire euphotic zone. However, the values taken from images are used accordingly to a plane and associated with the respective point or area of surface. The calibration of bio-optical models considering only the surface sampling data can not deliver fully effective results because the electromagnetic radiation interacts with the components located along the water column and the response captured by the sensors does not only represent the value associated with the surface. Considering this scenario, this work proposes an investigation on the influence of the vertical distribution of the optical properties along the water column, in order to contemplate records about the interaction in different levels of depth, besides the spatial disposition itself, being configured as a genuinely three-dimensional environment. For that, data collected by in situ spectral sensors and by hyperspectral camera in an aerial platform are used to construct the model. Finally, it is expected that the final product of this investigation, composed of the three-dimensional model adjusted from semi-analytical and empirical relations, may be an unprecedented contribution to the Remote Sensing area, and allow to identify relations along the water body volume which may assist as subsidies for the improvement of bio-optical models and derivation from other related studies about depth-related optical properties.