The information required for sustainable development policies regarding environmental issues (vulnerability, conservation, etc.), protecting natural resources, energy saving and reducing pollutant emissions is increasingly often analysed and presented using the geographic information systems that support those working in the sector in planning their activities. The demand for spatial data that can reflect the complexity of the various different territorial problems continues to grow, and the use of thematic maps is now widely recognised as a valid tool for planning preliminary interventions and scenario-based assessments in the areas in question. The LaMMA Consortium's Geoportal was established as a Spatial Data Infrastructure using Open Source technologies, with the multiple aims of improving the sharing and flow of data between the various public bodies, avoiding duplication of products and offering all potential users free and easy access to the geographical products available and to the information they contain. The system is designed to facilitate the distribution, viewing and cataloguing (data and related metadata) of all geospatial products elaborated and used by the consortium on a daily basis in the various meteorological and environmental applications, while complying as closely as possible with the standards of the OGC (Open Geospatial Consortium), the specifications of the European Parliament's INSPIRE directive (INSPIRE, 2007) and the indications in the DigitPA national directory of territorial data (formerly CNIPA). Access the LaMMA Consortium GeoPortal. Meteorological and environmental data in the geoportal This infrastructure of geographical data contains thematic series derived from the spatialization of daily data from the network of meteorology stations, such as the cumulative monthly rainfall, number of rainy days, and average maximum and minimum temperatures for the month. It also includes an archive for thematic series derived from the output of the WRF forecasting model (Weather Research and Forecasting ) currently used by the Region of Tuscany (precipitation at various time intervals, cloud cover, wind, air pressure, temperature, relative humidity, the zero-degree isotherm, 300 hPa jet stream, tropopause height, precipitable water, etc.) and from satellite observation data (images from meteorological satellites and observation of the earth in medium and high resolution, and elaborations of them). Currently, the maps published by the Geoportal cover: Climatology Cumulative monthly rainfall - (1995-2009); Average maximum monthly temperatures in °C - (1995-2009); Average minimum monthly temperatures in °C - (1995-2009); Number of rainy days - (1995-2009). Geology: Cartographic products (raster and vector) from the 1:10,000 Geological Map project of the region of Tuscany (735 sections); CISS (Significant Underground Bodies of Water): Investigation of underground aquifers, based on the new 1:10,000 geological map, relative to previous delimitations established by the 1:25,000 maps, in line with Regional Council Resolution n° 6 of 25 January 2005; OWS services (OGC Web Services) List of OWS services currently offered by the LAMMA Consortium WMS services (Web Map Service) - TUTORIAL (italian) Climatology Geology Map of the vegetation index (NDVI) WFS services (Web Feature Service) - TUTORIAL (italian) Geology WCS services (Web Coverage Service) - TUTORIAL (italian) Climatology Map of the vegetation index (NDVI) The reference software used was: Geonetwork opensource for metadata handling and publication; Geoserver and Mapserver for data distribution from the abovementioned web services.