Title :
Spatial and temporal dynamic of the trophic state in a large Amazonian hydroelectric reservoir
Author :
Curtarelli, M.P. ; Ogashawara, I. ; Alcantara, E.H. ; Lorenzzetti, J.A. ; Stech, J.L.
Author_Institution :
Remote Sensing Div., Nat. Inst. for Space Res., São José dos Campos, Brazil
Abstract :
We assessed the spatial and temporal dynamic of the trophic state in a large Amazonian hydroelectric reservoir during the Austral wintertime using images acquired by the Operational Land Imager (OLI) sensor on board the Landsat 8 satellite. We used the Spectral Angle Mapper (SAM) algorithm and reference in situ spectra to classify the OLI images according to a trophic state index (TSI). The results showed that the use of OLI images and the SAM algorithm were suitable for the mapping of the TSI in the Amazonian reservoirs. In our particular case, the reservoir presented a high spatial and temporal heterogeneity in the TSI during the studied period. However, further studies are needed to better characterize the dynamics of the trophic state and its driven forces.
Keywords :
geophysical image processing; hydrological techniques; image classification; remote sensing; reservoirs; Amazonian hydroelectric reservoir; Landsat 8 satellite; OLI images; SAM algorithm; austral wintertime; operational land imager sensor; spatial dynamic; spectral angle mapper algorithm; temporal dynamic; trophic state; trophic state index; Classification algorithms; Earth; Heuristic algorithms; Monitoring; Remote sensing; Reservoirs; Satellites; Amazon; hydroelectric reservoir; remote sensing; spectral angle mapper; trophic state index;
Conference_Titel :
Geoscience and Remote Sensing Symposium (IGARSS), 2014 IEEE International
Conference_Location :
Quebec City, QC
DOI :
10.1109/IGARSS.2014.6946568
