An integrated, agile approach for estimating solar radiation on building facades in complex urban environments

Urban solar radiation is a primary factor affecting indoor and outdoor thermal and lighting comfort. However, although 3D solar radiation models are achieving remarkable advances in urban climate planning support and decision making, they are time-consuming and cost-intensive. We aim at compensating for such limitations by providing an agile approach to estimate shadows and solar radiation on building facades, using elevation models (2.5D) and image processing techniques. This is achieved by making the best use of the new visibility toolset for raster processing, provided in ArcGIS, and GRASS GIS solar radiation 2D model. Results give a clear and detailed picture of the radiation condition in the study area, which offers promising opportunities for urban solar planning and assessment in complex urban areas.