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In the framework of a prospecting survey on the atoll of Aitutaki (Cook Islands) undertaken by the SOPAC, IFREMER has been charged with a pilot project, the purpose of which was to assess the use of remote sensing (SPOT) in the geomorphologic and bathymetric cartography of an atoll lagoon. The results of this project are presented according to two chapters. The first chapter proposes a numerical method for decorrelating the original variables and computing a textural parameter, which can be used to provide a map easy to interpret as far as geomorphologie studies are concerned. The second chapter proposes a method for inverting the relationship between radiometry and bathymetry, with a fit based on in situ measurements, resulting in the achievement of a bathymetric model for Aitutaki's lagoon.