PHOTOGRAMMETRIC TECHNIQUES AND GIS ENVIRONMENT FOR SEA CLIFF RETREAT ASSESSMENT (FORTE NOVO–TRAFAL AREA, ALGARVE). High-accuracy photogrammetric techniques were used in order to assess the sea cliff retreat in the area of Forte Novo – Trafal (Algarve) in the 1991-2001 period. They yielded an estimate of the top cliff retreat for Forte Novo of 22.7m, and of 8.4m for Trafal. The sediment volume that has been lost...
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