Six Mediterranean countries are participating in the "Mare Nostrum" project: "A Heritage Trail along the Phoenician maritime routes and through the historic port cities"; the goal of this project is to valorize the cultural heritage of the sites involved by promoting and supporting sustainable tourism. WP4 concentrates on the port cities of Tyre and Tartous, chosen as pilot sites. The on site research was conducted in accordance with the WP4 objectives: on the one hand a survey campaign was set up to acquire metric and qualitative data on the structures chosen as samples; on the other hand an enormous amount of photographic and video documentation was collected for the 3D models that were produced in the first phase. The paper will describe how the disciplines involved in Geomatics can provide important contributions to all four phases of the Heritage and Development framework.