A coastal WebGIS for data sharing and distribution

In accordance to the goals of ResMar subproject B, the two partners, Provincia di Olbia Tempio and Provincia di Livorno, through their cross-border centreoffices (OCEANS and CReStDiL) have developed a data sharing system in the form of two Web-based Geographical Information Systems (Web-GIS). Because of the different morphology of Sardinian (a large number of small pocket-beaches) and Tuscan (200 km of relatively wide beaches) coasts, the two platforms were structured differently. Provincia di OlbiaTempio developed an Atlas of Gallura beaches as a set of test sites; the contents are cartographic data derived from an aerial photogrammetric historical set (from 1954 to 2006), sedimentological and geomorphological data and hydrodynamic, wave and sedimentological models. Provincia di Livorno used a platform known as GEO-T, where users can frame any stretch of the Tuscan coast to view the different layers, and interact to obtain additional information as available from the database. Because of the considerable length of most Tuscan beaches, Provincia di Livorno developed a Web-GIS where there is no data gap between the northern and southern borders (with Liguria and Lazio, respectively).The landscape background is created using orthophotos andCTRs, and the shorelines drawn are replaced by lines from surveys and photo-interpretation, from 1938 until today. Each physiographic unit has been divided into 250 m long sectors, with a colour line showing shoreline evolution from 1984 to 2005. Another relevant layer is represented by the database containing data on coastal defence structures and ports, while territorial information is completed with data on the regional ecological network, hydrography and coastal dunes. The aim of both centres is to standardise other available data in order to permit their publication, and collect further data to allow for continuous monitoring.