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This work proposes the use of automatic co-registered satellite images to obtain large, high frequency and highly accurate shorelines time series. High resolution images are used to co-register Landsat and Sentinel-2 images. 90% of the co-registered images presented vertical and horizontal shift lower than 3 m. Satellite derived shorelines presented errors lower than mission's precision. A discussion is presented on the applicability of those shorelines through an application to Tordera Delta (Spain).

Coast changes.

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From 1988 to the present the Institute of Marine Biology and Ecology of Piombino has studied the marine environmental situation of the Gulf of Follonica (Italy), in collaboration with the Universities of Siena, Pisa, Urbino, Sassari, Corte (FR) and the CNR of Pisa. In recent years erosion has drastically changed the sandy beaches mainly as a consequence of the constant retreat of the P. oceanica meadows whose possible causes have been studied. Also in the Gulf of Baratti the methods adopted for the defense of the beach have been inadequate.

Coast changes.

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The coastal area of Bordj El Kiffane has experienced an artificialisation of its shoreline since 1980. This caused a remarkable decline of the shoreline. To remedy this, the solution recommended was the combination of several protection methods. In order to determine the consequence of the protective structures, a study of the historical evolution of the coastline was performed with ArcGIS and DSAS. The results allowed determining its evolutionary rates and comparing the evolutions on different periods in absence and presence of the protection structures.

Coast changes. --- Coasts --- Remote sensing.

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Coast changes --- Cliffs --- Beach erosion --- Remote sensing. --- Monitoring --- Data processing.

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Beaches. --- Plages --- Coasts. --- Littoraux --- Coast changes. --- Littoraux --- Modifications