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Cylindrical-shape tanks are typical of any suburban area and often contain dangerous gases or fluids. In this paper, we suggest a way to monitor them by means of high resolution Synthetic Aperture Radar (SAR) images and a scattering model able to quantitatively consider how the radar signal interacts with this kind of structures and how they appear m the SAR images. Adopting the model, geometrical information as the tank height is retrieved from the SAR images m a non-conventional way that is exploiting the information content contained m the double reflection contribution to the radar cross section. Results are compared with more traditional methods and discussed.