This work shows the geophysical study carried out at La Lonja de los Mercaderes of Valencia (15th c. Spain), which was declared a World Heritage site in 1996 by UNESCO. The main objective has been to determine the exact outline of the Moorish moat and map it by using two geophysical techniques: Gravimetry and GPR. The study has been carried out as part of the Project for the Restoration and Cleaning of the building. Gravimetric and GPR studies were conducted in two and three areas, respectively. The correlation and modelling of the results of these techniques has lead us to conclude that the moat is in fact beneath La Lonja, showing its outline and dimensions. Moreover, this study also allows us to assume that in some areas the moat is partially filled in. The results obtained in this survey are a good example of combining high resolution methods, i.e. GPR and microgravimetry, as an efficient and respectful tool in cultural Heritage. This combination of techniques could help to avoid destructive actions both in excavations works and in restoration projects as well as in the rehabilitation and cleaning of historical buildings, specially in World Heritage Sites.


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