This report summarizes the activities carried out at the end of the three-year period 2019-2021 of systems research (SR), in relation to Work Package 3 “Solar Source and Environment”, with insights into the activities carried out in the activity line LA3.05, which has as its main objective the production of georeferenced maps of normal direct solar irradiance over Italy. This component of solar irradiance is mainly used by some photovoltaic production technologies, including Concentrator Photovoltaics (CPV) and solar tracking systems. To assess the producibility of these technologies, it is not sufficient to know the global solar radiation on a horizontal plane, as is the case for other photovoltaic technologies. Given the need to accelerate the penetration of photovoltaics in Italy in order to achieve the energy objectives set by the National Integrated Energy and Climate Plan, reinforced by the entry into force of the European Fit for 55 Plan, the need to have geo-referenced maps of the normal direct component available has consolidated in order to plan high-efficiency PV installations and to be able to monitor their efficient operation. The dataset for the production of the above-mentioned maps has been produced in this project through progressive work over a period of three years, consisting of the management and optimization of the only national network for measuring spectral direct normal irradiance (SDNI), together with the acquisition and analysis of satellite data provided by Meteosat Second Generation. These studies have made it possible to evaluate the effect of atmospheric components (ozone, water vapor and, in particular, aerosols) on the attenuation of the direct component normal to the ground (DNI), thus guiding the development of the ARTEMIS DNI estimation model, implemented in the RdS 2.2 project, which consists of a radiative transfer model fed with meteorological numerical modeling data and aerosol transmission information obtained from satellite data. The terrestrial SDNI measurements collected and processed in this project have allowed the verification of the ARTEMIS algorithm. Finally, the application of ARTEMIS on a 4.0 x 4.5 km grid, corresponding to that of the satellite images, has made it possible to obtain georeferenced maps of direct normal solar irradiance under clear sky conditions over the entire Italian territory.