A simplified algorithm for SAR-based bathymetry is presented able to measure surface current variations generated by
the bottom topography from SAR intensity images and to reduce the need for both a-priori information and human-inthe-
loop operations. The algorithm is first analyzed from a theoretical point of view and an error budget model is
developed to estimate the achievable depth accuracy as a function of the uncertainty in the input parameters. Preliminary
experimental results are also presented in which the algorithm is applied to both COSMO-SkyMed and ALOS images of
the Gulf of Naples. The results show that the technique has the potential to generate depth measures that are significantly
denser than those commonly reported in the nautical charts.