On 3rd, 4th and 5th of February Catania celebrates its Patron Saint Agata with a religious festival gathering every year more than 700,000 people. The scientific article below reports an experimental approach of Saint Agata celebration, analyzing risks and excellent relief routes on Q-GIS platform. The starting point of the project has been the collection of data about the street path of the celebration, such as paving materials, slope average and people density. All this information has been used to produce a risk scale to highlight the most dangerous phases of the procession. An example of excellent (relief routes) optimal path has been produced to reach the nearest hospitals. The project has been implemented using QGIS 2.0.1 and GRASS GIS.
