The overall objective of SOLSTICE is to enable the optimal exploitation of the potential for PV installations in the Grand-Duchy of Luxembourg. As outlined above this will be achieved by enhancing the commissioned national solar irradiance cadastre. SOLSTICE will 1) add information on the suitability of façades for PV installations, 2) improve shadow-modelling throughout the seasons using high-resolution 3D geometry of buildings and infrastructure, 3) incorporate the latest solar radiation flux model and 4) cross-evaluate and quality control the 3D geometry from the commissioned cadastre and that derived by SOLSTICE.