Il contributo della geomatica alla valutazione delle allerte meteorologiche

There are various techniques, models and measures of atmospheric parameters used in weather forecasting: from observations on the ground to measures by weather balloons, from satellite images to weather radar. It’s well known that it is possible to estimates tropospheric zenith delay (Zenith Total Delay, ZTD) from the analysis of the signal observed by a network of GNSS Permanent Stations. This paper analyze main passages for the assessment of Precipitable Water Vapor (PWV) from ZTD estimates, integrated by measurements of pressure and temperature on the ground, the latter described by the Digital Terrain Model (DTM). The proposed solutions allow to create spatial-temporal maps of the potentially precipitable water vapor content, either as contribution to an atmospheric monitoring, that to provide useful information the triggering of predictive models to support decisions for nowcasting. The application to a case study particularly significant for the city of Genoa will show maps of the evolution of these parameters in a territory orographically complex as that of the Alps.