Sviluppo e sperimentazione di un sistema per l’estrazione dell’informazione batimetrica da immagini telerilevate

DEIDDA, MONICA;SANNA, GIOVANNA MARIA

2010-01-01

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Abstract

In order to monitor the coastal-sea environment it is necessary to check variations of the coastal line as well as the sea bottom. The studies aimed at defining the position of the former are countless but, on the other hand, the studies concerning the assessment of the bathymetry are very few. In relation to this, the present study uses the remote sensing as a possible technique for the monitoring of the sea dynamic of a local site. The model for the extraction of the bathymetry information is the Jupp Model, also called Depth of Penetration Zone (DOP Zone). The method, applied to Ikonos sensor high resolution imagery, requires a preliminary radiometric process in order to both correct the alteration of the light signal due to crossing into the atmosphere and achieve radiometric values that are representative of the depth only, as to homogenize the upwelling response from different bottom types (water column correction). Finally, where sunglint was present, as a result of the sun beams reflecting on the sea suface, it was corrected with a special procedure. The model was applied to a region near the city of Cagliari